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Hydra (genus)

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aggregates, cells initially distributed randomly undergo sorting and form two epithelial cell layers, in which the endodermal epithelial cells play more active roles in the process. Active mobility of these endodermal epithelial cells forms two layers in both the re-aggregate and the re-generating tip of the excised tissue. As these two layers are established, a patterning process takes place to form heads and feet.
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direction of the pair of foot gradients. The evidence for these gradients was shown in the early 1900s with grafting experiments. The inhibitors for both gradients have shown to be important to block the bud formation. The location where the bud forms is where the gradients are low for both the head and foot.
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are extraordinarily extensible and can be four to five times the length of the body. Once fully extended, the tentacles are slowly maneuvered around waiting for contact with a suitable prey animal. Upon contact, nematocysts on the tentacle fire into the prey, and the tentacle itself coils around the
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among a small population showing the feeding response after addition of glutathione. Recently, an assay for measuring the feeding response in hydra has been developed. In this method, the linear two-dimensional distance between the tip of the tentacle and the mouth of hydra was shown to be a direct
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into the water, and these can fertilize the egg in the ovary of another individual. The fertilized eggs secrete a tough outer coating, and, as the adult dies (due to starvation or cold), these resting eggs fall to the bottom of the lake or pond to await better conditions, whereupon they hatch into
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are capable of regenerating from pieces of tissue from the body and additionally after tissue dissociation from reaggregates. This process takes place not only in the pieces of tissue excised from the body column, but also from re-aggregates of dissociated single cells. It was found that in these
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is sliced into many segments, the middle slices form both a "head" and a "foot". The polarity of the regeneration is explained by two pairs of positional value gradients. There is both a head and foot activation and inhibition gradient. The head activation and inhibition works in an opposite
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prey. Most of the tentacles join in the attack within 30 seconds to subdue the struggling prey. Within two minutes, the tentacles surround the prey and move it into the open mouth aperture. Within ten minutes, the prey is engulfed within the body cavity, and digestion commences.
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with the mouth and tentacles and then relocate the foot, which provides the usual attachment, this process is called looping. In somersaulting, the body then bends over and makes a new place of attachment with the foot. By this process of "looping" or "somersaulting", a
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J. F., Cazet; S., Siebert; H. M., Little; P., Bertemes; A. S., Primack; P., Ladurner; M., Achrainer; M. T., Fredriksen; R. T., Moreland; S., Singh; S., Zhang; T. G., Wolfsberg; T. G., Schnitzler; A. D., Baxevanis; O., Simakov; B., Hobmayer; C. E., Juliano (2023).
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body up to 10 mm (0.39 in) long when extended, secured by a simple adhesive foot known as the basal disc. Gland cells in the basal disc secrete a sticky fluid that accounts for its adhesive properties.
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Due to the simplicity of their life cycle when compared to other hydrozoans, hydras have lost many genes that correspond to cell types or metabolic pathways of which the ancestral function is still unknown.
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Estep PW (September 2010). "Declining asexual reproduction is suggestive of senescence in hydra: comment on Martinez, D., "Mortality patterns suggest lack of senescence in hydra." Exp Gerontol 33, 217–25".
1425:. Among differentiated cells some express genes from families that date from the base of metazoans, like gland and neuronal cells, and others express genes from newer families, originating from the base of 852:, but do occasionally move quite readily, especially when hunting. They have two distinct methods for moving – 'looping' and 'somersaulting'. They do this by bending over and attaching themselves to the 1238:), the transcription factor FoxO affects stress response, lifespan, and increase in stem cells. If this transcription factor is knocked down in bilaterian model organisms, such as 1541:
Jung S, Dingley AJ, Augustin R, Anton-Erxleben F, Stanisak M, Gelhaus C, Gutsmann T, Hammer MU, Podschun R, Bonvin AM, Leippe M, Bosch TC, Grötzinger J (January 2009).
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of the same chromosome. It presents a great number of intercentromeric interactions when compared to other cnidarians, probably due to the loss of multiple subunits of
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Boehm AM, Khalturin K, Anton-Erxleben F, Hemmrich G, Klostermeier UC, Lopez-Quintero JA, Oberg HH, Puchert M, Rosenstiel P, Wittlieb J, Bosch TC (November 2012).
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Cantor, Marvin H.; Rahat, Menachem (1982). "Regulation of Respiration and Photosynthesis in Hydra viridis and in Its Separate Cosymbionts: Effect of Nutrients".
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measure of the extent of the feeding response. This method has been validated using a starvation model, as starvation is known to cause enhancement of the
956: 1280:. The repair pathways facilitate DNA replication by removing DNA damage. Their identification in hydra was based, in part, on the presence in its 1390:) are mostly located less than 2000 base pairs upstream from the closest transcription initiation site, but there are CREs located further away. 834:
are alarmed or attacked, the tentacles can be retracted to small buds, and the body column itself can be retracted to a small gelatinous sphere.
1876: 3057: 1433:, like nematocysts. Interstitial cells contain translation factors with a function that has been conserved for at least 400 million years. 933:
When a hydra is well fed, a new bud can form every two days. When conditions are harsh, often before winter or in poor feeding conditions,
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generally react in the same way regardless of the direction of the stimulus, and this may be due to the simplicity of the nerve nets.
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Wong, WY; Simakov, O; Bridge, DM; Cartwright, P; Bellantuono, AJ; Kuhn, A; Holstein, TW; David, CN; Steele, RE; Martínez, DE (2019).
3005: 1676: 2291:"Hydra nematocysts in the flatworm Microstomum lineare: in search for alterations preceding their disappearance from the new host" 3152: 3031: 1367:
and is absent in the green hydra, which has a repeating landscape similar to other cnidarians. These genome characteristics make
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extend their body to maximum length and then slowly extend their tentacles. Despite their simple construction, the tentacles of
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of genes homologous to ones present in other genetically well studied species playing key roles in these DNA repair pathways.
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reproduce by just budding off a whole new individual; the bud occurs around two-thirds of the way down the body axis. When a
2741:"Expansion of a single transposable element family is associated with genome-size increase and radiation in the genus Hydra" 1331: 3036: 1386:
have been created with regions around 500 to 2000 bases upstream of the gene of interest. Its cis-regulatory elements (
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into whatever triggered the release. This can paralyze the prey, especially if many hundreds of nematocysts are fired.
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Bathia, Jay; Schröder, Katja; Fraune, Sebastian; Lachnit, Tim; Rosenstiel, Philip; Bosch, Thomas C. G. (6 June 2022).
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are approximately 1 Gb in size. This is because the brown hydra genome is the result of an expansion event involving
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has a part severed, it will regenerate much like the mythical hydra’s heads. Biologists are especially interested in
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populations that create many different cell types. These stem cells continually renew themselves in the body column
3062: 2997: 153: 3124: 3044: 1363:, in particular, a single family of the CR1 class. This expansion is unique to this subgroup of the genus 2932: 2927: 2914: 2018:"Symbiotic Algae of Hydra viridissima Play a Key Role in Maintaining Homeostatic Bacterial Colonization" 1421:(stem cells, neuron and nematocyst precursors, and germ cells) express genes from families that predate 1273: 662: 3098: 1192:(do not age), and that they are proof of the existence of non-senescing organisms generally. In 2010, 3111: 3072: 1474: 941:. Swellings in the body wall develop into either ovaries or testes. The testes release free-swimming 774: 673:. Each tentacle, or cnida (plural: cnidae), is clothed with highly specialised stinging cells called 2804:"A chromosome-scale epigenetic map of the Hydra genome reveals conserved regulators of cell state" 66: 2682:
Chapman JA, Kirkness EF, Simakov O, Hampson SE, Mitros T, Weinmaier T, et al. (March 2010).
2244:"Organelle survival in a foreign organism: Hydra nematocysts in the flatworm Microstomum lineare" 1239: 1211:
has attracted much attention from scientists. Research today appears to confirm Martinez' study.
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Venturini G (1987). "The hydra GSH receptor. Pharmacological and radioligand binding studies".
1543:"Hydramacin-1, structure and antibacterial activity of a protein from the basal metazoan Hydra" 1387: 1181: 635: 24: 1360: 1308:
is becoming an increasingly better model system as more genetic approaches become available.
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Loomis WF (October 1955). "Glutathione control of the specific feeding reactions of hydra".
1256:), when FoxO levels were decreased, there was a negative effect on many key features of the 2953: 2901: 2752: 2695: 2568: 2076: 1966: 1954: 1608: 1326: 1277: 1216: 930:. The buds form from the body wall, grow into miniature adults and break away when mature. 923: 909: 593: 8: 1449: 1379: 1043: 934: 849: 754: 700: 2830: 2803: 2756: 2699: 2572: 2080: 1970: 1891: 1612: 919:
Most hydra species do not have any gender system. Instead, when food is plentiful, many
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At the free end of the body is a mouth opening surrounded by one to twelve thin, mobile
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is sliced into many segments then the middle slices form both a "head" and a "foot".
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Barve, Apurva; Galande, Alisha A.; Ghaskadbi, Saroj S.; Ghaskadbi, Surendra (2021).
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of their bases or by detaching from the substrate and floating away in the current.
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Comparative Biochemistry and Physiology. C, Comparative Pharmacology and Toxicology
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Martínez DE (May 1998). "Mortality patterns suggest lack of senescence in hydra".
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Different Hydra cell types express gene families of different evolutionary ages.
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have two significant structures on their body: the "head" and the "foot". When a
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Proceedings of the National Academy of Sciences of the United States of America
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attractive for studies of transposon-driven speciations and genome expansions.
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demonstrates the sophistication of what appears to be a simple nervous system.
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level 2 – interconnected ganglion cells synapsed to epithelial or motor cells.
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This article is about the aquatic animal. For the mythological monster, see
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Its chromatin has a Rabl configuration. There are interactions between the
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Reduction of glutathione causes reduction in the tentacle spread in hydra.
3018: 2886: 2668: 2557:"FoxO is a critical regulator of stem cell maintenance in immortal Hydra" 1780: 1090: 712: 2707: 1730: 1453:, another cnidarian (a jellyfish) that scientists believe to be immortal 985:, which is usually the life stage where sexual reproduction occurs, but 793:
and touch-sensitive nerve cells located in the body wall and tentacles.
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is composed of 50,000 to 100,000 cells which consist of three specific
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comparison analysis done within the last decade demonstrated that
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Cnidaria: Hydrozoa Süsswasserfauna von Mitteleuropa. Bd 1/2+ 3
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is cut in half, each half regenerates and forms into a small
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is cut in half, each half regenerates and forms into a small
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stem cells have a capacity for indefinite self-renewal. The
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Muscatine, Leonard; Lenhoff, Howard M. (15 November 1963).
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products from the algae are beneficial as a food source to
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Tomczyk S, Fischer K, Austad S, Galliot B (January 2015).
1184:. This publication has been widely cited as evidence that 1140:(tissue regeneration) when injured or severed. Typically, 970:
and may produce both testes and ovaries at the same time.
719:; it protects the outer layer against infection. A single 2669:"Transgenic Hydra Facility, University of Kiel (Germany)" 2199:"Measuring glutathione-induced feeding response in hydra" 1842: 757:, while larger excreta are discharged through the mouth. 861:
can move several inches (c. 100 mm) in a day.
1955:"Symbiosis: On the Role of Algae Symbiotic with Hydra" 622:, which was the many-headed beast of myth defeated by 581: 1312:
have become attractive model organisms to study the
569: 566: 1817: 677:. Cnidocytes contain specialized structures called 560: 557: 1889: 1803:Patton WK (August 2014). "Hydra (coelenterate)". 1521: 1397:of different chromosomes and the centromeres and 1378:Hydra genome shows a preference towards proximal 1072: 3139: 2109: 1952: 796:The structure of the nerve net has two levels: 2196: 2110:Bellis SL, Laux DC, Rhoads DE (November 1994). 1709:(3). The University of Chicago Press: 281–288. 699:, a gel-like substance. The outer layer is the 2800: 2619:"DNA Repair Repertoire of the Enigmatic Hydra" 872: 800:level 1 – sensory cells or internal cells; and 638:; they do not appear to die of old age, or to 2389: 1172:Daniel Martinez claimed in a 1998 article in 1000:mainly feed on aquatic invertebrates such as 654:Schematic drawing of a discharging nematocyst 2612: 2610: 1050:. The algae are protected from predators by 2152: 2103: 1822:. Stuttgart: Spektrum Akademischer Verlag. 1745: 1700: 1601:Invertebrate Reproduction & Development 1597:"Hydra, a powerful model for aging studies" 773:, which is structurally simple compared to 2398:"Hydra regeneration and epitheliopeptides" 2349:"Hydra regeneration and epitheliopeptides" 2069:Annals of the New York Academy of Sciences 1890:Thorington, Glyne; Margulis, Lynn (1981). 1875:: CS1 maint: location missing publisher ( 1028:can stretch their body wall considerably. 691:has two main body layers, which makes it " 42: 2829: 2819: 2774: 2764: 2715: 2644: 2634: 2607: 2590: 2580: 2423: 2364: 2218: 2158: 2127: 2043: 2033: 1779: 1769: 1751: 1628: 1558: 1511:(4th ed.). Primis Custom Publishing. 1506: 1472: 1252:(a radially symmetrical member of phylum 2462: 2395: 2346: 1207:The controversial unlimited lifespan of 1076: 989:do not progress beyond the polyp phase. 876: 818: 814: 649: 2396:Fujisawa, Toshitaka (29 January 2003). 2197:Kulkarni R, Galande S (November 2014). 2192: 2190: 1656: 1473:Schuchert P (2011). Schuchert P (ed.). 1468: 1466: 3140: 2550: 2548: 2546: 2288: 2241: 2066: 1802: 1234:In bilaterally symmetrical organisms ( 1128: 2853: 2852: 2505: 2342: 2340: 1847:(Eighteenth ed.). New York, NY. 1754:"Hydra: Imaging Nerve Nets in Action" 3125:3B484273-FB37-45B3-9D5F-6F31CC3F6950 3099:FF75DF87-D54F-54CD-6F56-435F1A5D2206 3073:b7784a05-917e-4cb4-927d-ff13aaad356d 2998:0ca97b94-1537-4e70-8584-fb9c38012d5d 2187: 1652: 1650: 1648: 1590: 1588: 1586: 1522:Solomon E, Berg L, Martin D (2002). 1463: 703:, and the inner layer is called the 2543: 1547:The Journal of Biological Chemistry 749:Respiration and excretion occur by 13: 2337: 2089:10.1111/j.1749-6632.1955.tb35372.x 1843:Hickman, Cleveland P. Jr. (2019). 1818:Holstein T, Emschermann P (1995). 1412: 1268:Hydra are capable of two types of 1046:with various types of unicellular 14: 3164: 2203:Journal of Visualized Experiments 1645: 1583: 1167: 760: 2412:American Association for Anatomy 2248:European Journal of Cell Biology 1845:Integrated principles of zoology 1487:World Register of Marine Species 977:go through a body change from a 614:regions. The genus was named by 553: 65: 2732: 2675: 2661: 2499: 2456: 2282: 2235: 2060: 2009: 1946: 1883: 1836: 1811: 1805:Grolier Multimedia Encyclopedia 1796: 1752:Ji N, Flavell SW (April 2017). 1382:. Thanks to this feature, many 695:". The layers are separated by 3153:Negligibly senescent organisms 1715:10.1086/physzool.55.3.30157891 1694: 1669: 1534: 1515: 1500: 1341:are usually less than 500 Mb ( 1073:Measuring the feeding response 1065:and even help to maintain the 753:throughout the surface of the 1: 2684:"The dynamic genome of Hydra" 2477:10.1016/S0531-5565(97)00113-7 1457: 1263: 807:Some have only two sheets of 789:. Nerve nets connect sensory 781:does not have a recognizable 645: 460:Lang da Silveira et al., 1997 2347:Fujisawa T (February 2003). 2173:10.1016/0742-8413(87)90015-6 2129:10.1016/0014-5793(94)01154-0 1979:10.1126/science.142.3594.956 1621:10.1080/07924259.2014.927805 1105: 7: 2521:10.1016/j.exger.2010.03.017 1436: 1287: 873:Reproduction and life cycle 10: 3171: 2307:10.1007/s00441-019-03149-w 2260:10.1016/j.ejcb.2018.04.002 1274:nucleotide excision repair 992: 981:to an adult form called a 379:Griffin & Peters, 1939 260:Hadley & Forrest, 1949 18: 2861: 2636:10.3389/fgene.2021.670695 2035:10.3389/fmicb.2022.869666 1771:10.1016/j.cub.2017.03.040 1300:share a minimum of 6,071 1031:The feeding behaviour of 606:. They are native to the 165: 160: 62:Scientific classification 60: 50: 41: 34: 2745:Proc Natl Acad Sci U S A 2509:Experimental Gerontology 2465:Experimental Gerontology 2295:Cell and Tissue Research 1198:Experimental Gerontology 1174:Experimental Gerontology 1085:The feeding response in 777:animal nervous systems. 2766:10.1073/pnas.1910106116 2582:10.1073/pnas.1209714109 1896:The Biological Bulletin 1483:World Hydrozoa database 826:attached to a substrate 715:recently discovered in 287:De Carvalho Wolle, 1978 2403:Developmental Dynamics 2353:Developmental Dynamics 2289:Krohne, Georg (2020). 2242:Krohne, Georg (2018). 1681:olympus.magnet.fsu.edu 1560:10.1074/jbc.M804713200 1116:is preyed upon by the 1082: 916: 827: 765:The nervous system of 655: 320:Hydra madagascariensis 25:Hydra (disambiguation) 23:. For other uses, see 2821:10.1101/gr.277040.122 2623:Frontiers in Genetics 1703:Physiological Zoology 1663:Developmental Biology 1361:transposable elements 1345:) in size, as in the 1182:biologically immortal 1080: 880: 822: 815:Motion and locomotion 653: 433:Chen & Wang, 2008 341:Cox & Young, 1973 2993:Fauna Europaea (new) 1507:Gilberson L (1999). 1327:Hydra magnipapillata 1278:base excision repair 1217:transcription factor 973:Many members of the 899:Daughter growing out 636:regenerative ability 536:Liu & Wang, 2010 2757:2019PNAS..11622915W 2751:(46): 22915–22917. 2708:10.1038/nature08830 2700:2010Natur.464..592C 2573:2012PNAS..10919697B 2081:1955NYASA..62..211L 1971:1963Sci...142..956M 1657:Gilbert SF (2000). 1613:2015InvRD..59S..11T 1450:Turritopsis dohrnii 1384:reporter cell lines 1196:published (also in 1129:Tissue regeneration 1122:Microstomum lineare 1044:mutual relationship 935:sexual reproduction 924:reproduce asexually 905:Daughter broken off 902:Beginning to cleave 533:Hydra zhujiangensis 421:Hydra plagiodesmica 359:Fan & Shi, 1999 251:Fan & Shi, 2003 16:Genus of cnidarians 2425:10.1002/dvdy.10221 2366:10.1002/dvdy.10221 1509:Zoology Lab Manual 1102:feeding response. 1083: 957:Hydra circumcincta 917: 828: 663:radially symmetric 656: 618:in 1758 after the 448:Hydra rutgersensis 212:Hydra circumcincta 185:Hydra beijingensis 3135: 3134: 3081:Open Tree of Life 2855:Taxon identifiers 2567:(48): 19697–702. 1965:(3594): 956–958. 1854:978-1-260-20519-0 1829:978-3-8274-0836-5 1807:. Grolier Online. 1348:Hydra viridissima 1320:. A draft of the 963:Hydra viridissima 865:may also move by 634:because of their 544: 543: 537: 528: 519: 508: 503:Hydra viridissima 497: 488: 479: 470: 469:Wang et al., 2009 461: 452: 443: 434: 425: 416: 407: 406:Cernosvitov, 1935 398: 389: 380: 371: 360: 351: 342: 333: 329:Hydra magellanica 324: 315: 306: 297: 288: 279: 270: 261: 252: 248:Hydra harbinensis 243: 234: 225: 221:Hydra daqingensis 216: 207: 203:Hydra cauliculata 198: 189: 180: 179:Swarczewsky, 1923 176:Hydra baikalensis 156: 134: 3160: 3128: 3127: 3115: 3114: 3102: 3101: 3089: 3088: 3076: 3075: 3066: 3065: 3053: 3052: 3050:NHMSYS0020703689 3040: 3039: 3027: 3026: 3014: 3013: 3001: 3000: 2988: 2987: 2975: 2974: 2962: 2961: 2949: 2948: 2936: 2935: 2923: 2922: 2910: 2909: 2897: 2896: 2895: 2882: 2881: 2880: 2850: 2849: 2844: 2843: 2833: 2823: 2798: 2789: 2788: 2778: 2768: 2736: 2730: 2729: 2719: 2679: 2673: 2672: 2665: 2659: 2658: 2648: 2638: 2614: 2605: 2604: 2594: 2584: 2552: 2541: 2540: 2503: 2497: 2496: 2460: 2454: 2453: 2427: 2393: 2387: 2386: 2368: 2344: 2335: 2334: 2286: 2280: 2279: 2239: 2233: 2232: 2222: 2194: 2185: 2184: 2156: 2150: 2149: 2131: 2107: 2101: 2100: 2064: 2058: 2057: 2047: 2037: 2022:Front. Microbiol 2013: 2007: 2006: 1950: 1944: 1943: 1887: 1881: 1880: 1874: 1866: 1840: 1834: 1833: 1815: 1809: 1808: 1800: 1794: 1793: 1783: 1773: 1764:(8): R294–R295. 1749: 1743: 1742: 1698: 1692: 1691: 1689: 1687: 1673: 1667: 1666: 1654: 1643: 1642: 1632: 1592: 1581: 1580: 1562: 1538: 1532: 1531: 1526:(6th ed.). 1519: 1513: 1512: 1504: 1498: 1497: 1495: 1493: 1470: 1419:Progenitor cells 1332:reported in 2010 1310:Transgenic hydra 1204:do not senesce. 1038:Some species of 584: 579: 578: 575: 574: 571: 568: 565: 562: 559: 535: 526: 524:Hydra zeylandica 517: 506: 495: 486: 477: 468: 459: 457:Hydra salmacidis 450: 441: 432: 430:Hydra polymorpha 423: 414: 405: 403:Hydra paranensis 396: 394:Hydra paludicola 387: 378: 369: 358: 349: 340: 331: 322: 313: 304: 295: 286: 284:Hydra intermedia 277: 268: 259: 250: 241: 232: 223: 214: 205: 196: 194:Hydra canadensis 187: 178: 148: 132: 70: 69: 46: 32: 31: 3170: 3169: 3163: 3162: 3161: 3159: 3158: 3157: 3138: 3137: 3136: 3131: 3123: 3118: 3110: 3105: 3097: 3092: 3084: 3079: 3071: 3069: 3061: 3056: 3048: 3043: 3035: 3030: 3022: 3017: 3009: 3004: 2996: 2991: 2983: 2978: 2970: 2965: 2957: 2952: 2944: 2939: 2931: 2926: 2918: 2913: 2905: 2900: 2891: 2890: 2885: 2876: 2875: 2870: 2857: 2847: 2808:Genome Research 2799: 2792: 2737: 2733: 2694:(7288): 592–6. 2680: 2676: 2667: 2666: 2662: 2615: 2608: 2553: 2544: 2504: 2500: 2461: 2457: 2394: 2390: 2345: 2338: 2287: 2283: 2240: 2236: 2195: 2188: 2157: 2153: 2108: 2104: 2065: 2061: 2014: 2010: 1951: 1947: 1908:10.2307/1540911 1888: 1884: 1868: 1867: 1855: 1841: 1837: 1830: 1816: 1812: 1801: 1797: 1758:Current Biology 1750: 1746: 1699: 1695: 1685: 1683: 1675: 1674: 1670: 1665:(6th ed.). 1655: 1646: 1607:(sup1): 11–16. 1593: 1584: 1553:(3): 1896–905. 1539: 1535: 1520: 1516: 1505: 1501: 1491: 1489: 1479:Linnaeus, 1758" 1471: 1464: 1460: 1439: 1415: 1413:Transcriptomics 1407:heterochromatin 1337:The genomes of 1290: 1266: 1229:down-regulation 1170: 1131: 1113:Hydra oligactis 1108: 1075: 1015:While feeding, 995: 937:occurs in some 915: 893:Non-reproducing 875: 867:amoeboid motion 817: 763: 661:has a tubular, 648: 582: 556: 552: 540: 493:Hydra utahensis 366:Hydra oligactis 311:Hydra liriosoma 242:(Forrest, 1959) 230:Hydra ethiopiae 171: 170: 147: 131: 64: 28: 17: 12: 11: 5: 3168: 3167: 3156: 3155: 3150: 3133: 3132: 3130: 3129: 3116: 3103: 3090: 3077: 3067: 3054: 3041: 3028: 3015: 3002: 2989: 2980:Fauna Europaea 2976: 2963: 2950: 2937: 2924: 2911: 2898: 2883: 2867: 2865: 2859: 2858: 2846: 2845: 2814:(2): 283–298. 2790: 2731: 2674: 2660: 2606: 2542: 2498: 2455: 2388: 2336: 2281: 2254:(4): 289–299. 2234: 2205:(93): e52178. 2186: 2151: 2102: 2059: 2008: 1945: 1902:(1): 175–188. 1882: 1853: 1835: 1828: 1810: 1795: 1744: 1693: 1668: 1659:"Regeneration" 1644: 1582: 1533: 1514: 1499: 1461: 1459: 1456: 1455: 1454: 1446: 1443:Lernaean Hydra 1438: 1435: 1414: 1411: 1289: 1286: 1265: 1262: 1221:forkhead box O 1169: 1168:Non-senescence 1166: 1130: 1127: 1107: 1104: 1089:is induced by 1074: 1071: 1056:photosynthetic 994: 991: 968:hermaphrodites 954:species, like 914: 913: 906: 903: 900: 897: 896:Creating a bud 894: 890: 874: 871: 844:are generally 816: 813: 805: 804: 801: 791:photoreceptors 762: 761:Nervous system 759: 647: 644: 626:, as when the 542: 541: 539: 538: 529: 520: 514:Hydra vulgaris 509: 498: 489: 480: 475:Hydra thomseni 471: 466:Hydra sinensis 462: 453: 444: 435: 426: 417: 408: 399: 390: 385:Hydra oxycnida 381: 372: 361: 356:Hydra mohensis 352: 343: 334: 325: 323:Campbell, 1999 316: 314:Campbell, 1987 307: 302:Hydra javanica 298: 293:Hydra japonica 289: 280: 271: 266:Hydra iheringi 262: 253: 244: 235: 226: 217: 208: 199: 190: 181: 168: 167: 166: 163: 162: 158: 157: 140: 136: 135: 126: 122: 121: 116: 112: 111: 106: 102: 101: 96: 92: 91: 86: 82: 81: 76: 72: 71: 58: 57: 48: 47: 39: 38: 21:Lernaean Hydra 15: 9: 6: 4: 3: 2: 3166: 3165: 3154: 3151: 3149: 3146: 3145: 3143: 3126: 3121: 3117: 3113: 3108: 3104: 3100: 3095: 3091: 3087: 3082: 3078: 3074: 3068: 3064: 3059: 3055: 3051: 3046: 3042: 3038: 3033: 3029: 3025: 3020: 3016: 3012: 3007: 3003: 2999: 2994: 2990: 2986: 2981: 2977: 2973: 2968: 2964: 2960: 2955: 2951: 2947: 2942: 2938: 2934: 2929: 2925: 2921: 2916: 2912: 2908: 2903: 2899: 2894: 2888: 2884: 2879: 2873: 2869: 2868: 2866: 2864: 2860: 2856: 2851: 2841: 2837: 2832: 2827: 2822: 2817: 2813: 2809: 2805: 2797: 2795: 2786: 2782: 2777: 2772: 2767: 2762: 2758: 2754: 2750: 2746: 2742: 2735: 2727: 2723: 2718: 2713: 2709: 2705: 2701: 2697: 2693: 2689: 2685: 2678: 2670: 2664: 2656: 2652: 2647: 2642: 2637: 2632: 2628: 2624: 2620: 2613: 2611: 2602: 2598: 2593: 2588: 2583: 2578: 2574: 2570: 2566: 2562: 2558: 2551: 2549: 2547: 2538: 2534: 2530: 2526: 2522: 2518: 2514: 2510: 2502: 2494: 2490: 2486: 2482: 2478: 2474: 2471:(3): 217–25. 2470: 2466: 2459: 2451: 2447: 2443: 2439: 2435: 2431: 2426: 2421: 2417: 2413: 2409: 2405: 2404: 2399: 2392: 2384: 2380: 2376: 2372: 2367: 2362: 2358: 2354: 2350: 2343: 2341: 2332: 2328: 2324: 2320: 2316: 2312: 2308: 2304: 2300: 2296: 2292: 2285: 2277: 2273: 2269: 2265: 2261: 2257: 2253: 2249: 2245: 2238: 2230: 2226: 2221: 2216: 2212: 2211:10.3791/52178 2208: 2204: 2200: 2193: 2191: 2182: 2178: 2174: 2170: 2166: 2162: 2155: 2147: 2143: 2139: 2135: 2130: 2125: 2121: 2117: 2113: 2106: 2098: 2094: 2090: 2086: 2082: 2078: 2075:(9): 211–27. 2074: 2070: 2063: 2055: 2051: 2046: 2041: 2036: 2031: 2027: 2023: 2019: 2012: 2004: 2000: 1996: 1992: 1988: 1984: 1980: 1976: 1972: 1968: 1964: 1960: 1956: 1949: 1941: 1937: 1933: 1929: 1925: 1921: 1917: 1913: 1909: 1905: 1901: 1897: 1893: 1886: 1878: 1872: 1864: 1860: 1856: 1850: 1846: 1839: 1831: 1825: 1821: 1814: 1806: 1799: 1791: 1787: 1782: 1781:1721.1/114954 1777: 1772: 1767: 1763: 1759: 1755: 1748: 1740: 1736: 1732: 1728: 1724: 1720: 1716: 1712: 1708: 1704: 1697: 1682: 1678: 1672: 1664: 1660: 1653: 1651: 1649: 1640: 1636: 1631: 1626: 1622: 1618: 1614: 1610: 1606: 1602: 1598: 1591: 1589: 1587: 1578: 1574: 1570: 1566: 1561: 1556: 1552: 1548: 1544: 1537: 1529: 1525: 1518: 1510: 1503: 1488: 1484: 1480: 1478: 1469: 1467: 1462: 1452: 1451: 1447: 1444: 1441: 1440: 1434: 1432: 1428: 1424: 1420: 1410: 1408: 1404: 1400: 1396: 1391: 1389: 1385: 1381: 1376: 1372: 1370: 1366: 1362: 1358: 1354: 1350: 1349: 1344: 1340: 1335: 1333: 1329: 1328: 1323: 1319: 1315: 1311: 1307: 1304:with humans. 1303: 1299: 1295: 1285: 1283: 1279: 1275: 1271: 1261: 1259: 1255: 1251: 1250: 1245: 1241: 1237: 1232: 1230: 1226: 1222: 1218: 1214: 1210: 1205: 1203: 1199: 1195: 1194:Preston Estep 1191: 1187: 1183: 1179: 1175: 1165: 1162: 1158: 1155: 1151: 1147: 1143: 1139: 1135: 1126: 1124: 1123: 1119: 1115: 1114: 1103: 1101: 1096: 1092: 1088: 1079: 1070: 1068: 1064: 1061: 1057: 1054:; in return, 1053: 1049: 1045: 1041: 1036: 1034: 1029: 1027: 1022: 1018: 1013: 1011: 1010: 1005: 1004: 999: 990: 988: 984: 980: 976: 971: 969: 965: 964: 959: 958: 953: 949: 944: 940: 936: 931: 929: 925: 922: 911: 907: 904: 901: 898: 895: 892: 891: 888: 887: 883: 879: 870: 868: 864: 860: 855: 851: 847: 843: 839: 837: 833: 825: 821: 812: 810: 802: 799: 798: 797: 794: 792: 788: 784: 780: 776: 772: 768: 758: 756: 752: 747: 745: 741: 737: 733: 730: 726: 722: 718: 714: 710: 706: 702: 698: 694: 690: 686: 684: 680: 676: 672: 667: 664: 660: 652: 643: 641: 637: 633: 629: 625: 621: 617: 613: 609: 605: 602: 598: 595: 591: 587: 586: 577: 550: 549: 534: 530: 525: 521: 516: 515: 510: 505: 504: 499: 494: 490: 485: 481: 478:Cordero, 1941 476: 472: 467: 463: 458: 454: 451:Forrest, 1963 449: 445: 440: 439:Hydra robusta 436: 431: 427: 422: 418: 413: 409: 404: 400: 395: 391: 388:Schulze, 1914 386: 382: 377: 376:Hydra oregona 373: 368: 367: 362: 357: 353: 350:Forrest, 1963 348: 344: 339: 338:Hydra mariana 335: 332:Schulze, 1927 330: 326: 321: 317: 312: 308: 305:Schulze, 1929 303: 299: 294: 290: 285: 281: 276: 272: 269:Cordero, 1939 267: 263: 258: 257:Hydra hymanae 254: 249: 245: 240: 239:Hydra hadleyi 236: 233:Hickson, 1930 231: 227: 222: 218: 215:Schulze, 1914 213: 209: 204: 200: 195: 191: 186: 182: 177: 173: 172: 164: 159: 155: 151: 146: 145: 141: 138: 137: 130: 127: 124: 123: 120: 119:Anthoathecata 117: 114: 113: 110: 107: 104: 103: 100: 97: 94: 93: 90: 87: 84: 83: 80: 77: 74: 73: 68: 63: 59: 56: 53: 49: 45: 40: 37: 33: 30: 26: 22: 2862: 2811: 2807: 2748: 2744: 2734: 2691: 2687: 2677: 2663: 2626: 2622: 2564: 2560: 2515:(9): 645–6. 2512: 2508: 2501: 2468: 2464: 2458: 2418:): 182–189. 2407: 2401: 2391: 2359:(2): 182–9. 2356: 2352: 2301:(1): 63–71. 2298: 2294: 2284: 2251: 2247: 2237: 2202: 2167:(2): 321–4. 2164: 2160: 2154: 2122:(3): 320–4. 2119: 2116:FEBS Letters 2115: 2105: 2072: 2068: 2062: 2025: 2021: 2011: 1962: 1958: 1948: 1899: 1895: 1885: 1844: 1838: 1819: 1813: 1804: 1798: 1761: 1757: 1747: 1706: 1702: 1696: 1686:21 September 1684:. Retrieved 1680: 1671: 1662: 1604: 1600: 1550: 1546: 1536: 1523: 1517: 1508: 1502: 1490:. Retrieved 1482: 1476: 1448: 1416: 1403:condensin II 1392: 1377: 1373: 1368: 1364: 1359:, a type of 1353:brown hydras 1346: 1336: 1325: 1305: 1297: 1291: 1267: 1257: 1247: 1233: 1224: 1212: 1208: 1206: 1201: 1197: 1185: 1177: 1173: 1171: 1160: 1159: 1153: 1149: 1145: 1141: 1138:morphallaxis 1133: 1132: 1120: 1111: 1110:The species 1109: 1099: 1094: 1086: 1084: 1069:microbiome. 1066: 1062: 1059: 1051: 1039: 1037: 1032: 1030: 1025: 1020: 1016: 1014: 1007: 1001: 997: 996: 986: 972: 961: 955: 951: 947: 938: 932: 920: 918: 884: 881: 862: 858: 841: 840: 835: 831: 829: 823: 806: 795: 778: 775:more derived 766: 764: 748: 743: 739: 735: 731: 728: 720: 716: 705:gastrodermis 693:diploblastic 688: 687: 668: 658: 657: 631: 547: 546: 545: 532: 523: 518:Pallas, 1766 512: 507:Pallas, 1766 501: 492: 484:Hydra umfula 483: 474: 465: 456: 447: 438: 429: 420: 411: 402: 393: 384: 375: 370:Pallas, 1766 364: 355: 347:Hydra minima 346: 337: 328: 319: 310: 301: 292: 283: 275:Hydra intaba 274: 265: 256: 247: 238: 229: 220: 211: 202: 193: 184: 175: 143: 142: 128: 51: 35: 29: 3019:iNaturalist 2887:Wikispecies 1528:Brooks/Cole 1492:20 December 1395:centromeres 1249:H. vulgaris 1240:fruit flies 1091:glutathione 1042:exist in a 713:bactericide 683:neurotoxins 679:nematocysts 496:Hyman, 1931 442:(Itô, 1947) 424:Dioni, 1968 412:Hydra parva 206:Hyman, 1938 197:Rowan, 1930 3142:Categories 2629:: 670695. 2028:: 869666. 1863:1097367369 1458:References 1339:cnidarians 1270:DNA repair 1264:DNA repair 709:Hydramacin 675:cnidocytes 646:Morphology 597:hydrozoans 594:freshwater 527:Burt, 1929 487:Ewer, 1948 278:Ewer, 1948 133:Dana, 1846 2434:1058-8388 2331:209380951 2315:1432-0878 2268:1618-1298 1987:0036-8075 1916:0006-3185 1871:cite book 1723:0031-935X 1431:medusozoa 1423:metazoans 1399:telomeres 1380:promoters 1343:megabases 1314:evolution 1244:nematodes 1236:Bilateria 1106:Predators 912:of parent 908:Daughter 854:substrate 846:sedentary 771:nerve net 755:epidermis 751:diffusion 725:stem cell 701:epidermis 671:tentacles 608:temperate 592:of small 415:Itô, 1947 397:Itô, 1947 296:Itô, 1947 224:Fan, 2000 188:Fan, 2003 85:Kingdom: 79:Eukaryota 3148:Hydridae 2959:46551677 2872:Wikidata 2840:36639202 2831:10069465 2785:31659034 2726:20228792 2655:33995496 2601:23150562 2537:35408542 2529:20398746 2450:26953455 2442:12557197 2383:26953455 2375:12557197 2323:31848750 2276:29661512 2229:25490534 2146:29262166 2097:85570550 2054:35733963 2003:28578967 1995:17753799 1940:21008864 1790:28441559 1739:86961916 1731:30157891 1639:26120246 1569:19019828 1437:See also 1427:cnidaria 1318:immunity 1294:ortholog 1288:Genomics 1254:Cnidaria 1136:undergo 1118:flatworm 975:Hydrozoa 785:or true 697:mesoglea 642:at all. 624:Heracles 616:Linnaeus 612:tropical 604:Cnidaria 161:Species 150:Linnaeus 129:Hydridae 125:Family: 109:Hydrozoa 99:Cnidaria 95:Phylum: 89:Animalia 75:Domain: 3120:ZooBank 3011:9811888 2878:Q192290 2776:6859323 2753:Bibcode 2717:4479502 2696:Bibcode 2646:8117345 2592:3511741 2569:Bibcode 2493:2009972 2485:9615920 2220:4354099 2181:2888575 2138:7957948 2077:Bibcode 2045:9207534 1967:Bibcode 1959:Science 1932:6164406 1924:1540911 1630:4463768 1609:Bibcode 1577:3887876 1524:Biology 1190:senesce 1188:do not 1009:Cyclops 1003:Daphnia 993:Feeding 950:. Some 943:gametes 928:budding 886:budding 850:sessile 809:neurons 787:muscles 599:of the 588:) is a 139:Genus: 115:Order: 105:Class: 55:budding 3112:267491 3086:767784 3070:NZOR: 3024:203710 2985:215054 2972:1HDRAG 2933:104173 2838:  2828:  2783:  2773:  2724:  2714:  2688:Nature 2653:  2643:  2599:  2589:  2535:  2527:  2491:  2483:  2448:  2440:  2432:  2381:  2373:  2329:  2321:  2313:  2274:  2266:  2227:  2217:  2179:  2144:  2136:  2095:  2052:  2042:  2001:  1993:  1985:  1938:  1930:  1922:  1914:  1861:  1851:  1826:  1788:  1737:  1729:  1721:  1637:  1627:  1575:  1567:  1322:genome 1282:genome 1161:Hydras 1142:Hydras 1134:Hydras 983:medusa 966:, are 946:nymph 732:Hydras 628:animal 601:phylum 3107:WoRMS 3094:Plazi 3037:50845 2946:7P6HZ 2920:Hydra 2907:Hydra 2893:Hydra 2863:Hydra 2533:S2CID 2489:S2CID 2446:S2CID 2416:Wiley 2410:(2). 2379:S2CID 2327:S2CID 2142:S2CID 2093:S2CID 1999:S2CID 1936:S2CID 1920:JSTOR 1735:S2CID 1727:JSTOR 1573:S2CID 1477:Hydra 1369:Hydra 1365:Hydra 1357:LINEs 1306:Hydra 1302:genes 1298:Hydra 1258:Hydra 1225:Hydra 1213:Hydra 1209:Hydra 1202:Hydra 1186:Hydra 1178:Hydra 1176:that 1154:Hydra 1150:Hydra 1146:Hydra 1100:Hydra 1095:Hydra 1087:Hydra 1067:Hydra 1060:Hydra 1052:Hydra 1048:algae 1040:Hydra 1033:Hydra 1026:Hydra 1021:Hydra 1017:Hydra 998:Hydra 987:Hydra 979:polyp 952:Hydra 948:Hydra 939:Hydra 921:Hydra 910:clone 882:Hydra 863:Hydra 859:Hydra 842:Hydra 836:Hydra 832:Hydra 824:Hydra 783:brain 779:Hydra 769:is a 767:Hydra 744:Hydra 740:Hydra 736:Hydra 721:Hydra 717:Hydra 711:is a 689:Hydra 659:Hydra 632:Hydra 620:Hydra 590:genus 548:Hydra 144:Hydra 52:Hydra 36:Hydra 3063:6083 3058:NCBI 3032:ITIS 3006:GBIF 2967:EPPO 2928:BOLD 2836:PMID 2781:PMID 2722:PMID 2651:PMID 2597:PMID 2525:PMID 2481:PMID 2438:PMID 2430:ISSN 2371:PMID 2319:PMID 2311:ISSN 2272:PMID 2264:ISSN 2225:PMID 2177:PMID 2134:PMID 2050:PMID 1991:PMID 1983:ISSN 1928:PMID 1912:ISSN 1877:link 1859:OCLC 1849:ISBN 1824:ISBN 1786:PMID 1719:ISSN 1688:2019 1635:PMID 1565:PMID 1494:2011 1330:was 1276:and 1242:and 1180:are 1006:and 960:and 610:and 585:-drə 169:List 154:1758 3045:NBN 2954:EoL 2941:CoL 2915:AFD 2902:ADW 2826:PMC 2816:doi 2771:PMC 2761:doi 2749:116 2712:PMC 2704:doi 2692:464 2641:PMC 2631:doi 2587:PMC 2577:doi 2565:109 2517:doi 2473:doi 2420:doi 2408:226 2361:doi 2357:226 2303:doi 2299:379 2256:doi 2215:PMC 2207:doi 2169:doi 2124:doi 2120:354 2085:doi 2040:PMC 2030:doi 1975:doi 1963:142 1904:doi 1900:160 1776:hdl 1766:doi 1711:doi 1625:PMC 1617:doi 1555:doi 1551:284 1429:or 1388:CRE 1324:of 1316:of 1292:An 926:by 848:or 830:If 640:age 3144:: 3122:: 3109:: 3096:: 3083:: 3060:: 3047:: 3034:: 3021:: 3008:: 2995:: 2982:: 2969:: 2956:: 2943:: 2930:: 2917:: 2904:: 2889:: 2874:: 2834:. 2824:. 2812:33 2810:. 2806:. 2793:^ 2779:. 2769:. 2759:. 2747:. 2743:. 2720:. 2710:. 2702:. 2690:. 2686:. 2649:. 2639:. 2627:12 2625:. 2621:. 2609:^ 2595:. 2585:. 2575:. 2563:. 2559:. 2545:^ 2531:. 2523:. 2513:45 2511:. 2487:. 2479:. 2469:33 2467:. 2444:. 2436:. 2428:. 2406:. 2400:. 2377:. 2369:. 2355:. 2351:. 2339:^ 2325:. 2317:. 2309:. 2297:. 2293:. 2270:. 2262:. 2252:97 2250:. 2246:. 2223:. 2213:. 2201:. 2189:^ 2175:. 2165:87 2163:. 2140:. 2132:. 2118:. 2114:. 2091:. 2083:. 2073:62 2071:. 2048:. 2038:. 2026:13 2024:. 2020:. 1997:. 1989:. 1981:. 1973:. 1961:. 1957:. 1934:. 1926:. 1918:. 1910:. 1898:. 1894:. 1873:}} 1869:{{ 1857:. 1784:. 1774:. 1762:27 1760:. 1756:. 1733:. 1725:. 1717:. 1707:55 1705:. 1679:. 1661:. 1647:^ 1633:. 1623:. 1615:. 1605:59 1603:. 1599:. 1585:^ 1571:. 1563:. 1549:. 1545:. 1485:. 1481:. 1465:^ 1409:. 1334:. 1272:: 1231:. 1125:. 1012:. 889:: 811:. 583:HY 564:aɪ 531:* 522:* 511:* 500:* 491:* 482:* 473:* 464:* 455:* 446:* 437:* 428:* 419:* 410:* 401:* 392:* 383:* 374:* 363:* 354:* 345:* 336:* 327:* 318:* 309:* 300:* 291:* 282:* 273:* 264:* 255:* 246:* 237:* 228:* 219:* 210:* 201:* 192:* 183:* 174:* 152:, 2842:. 2818:: 2787:. 2763:: 2755:: 2728:. 2706:: 2698:: 2671:. 2657:. 2633:: 2603:. 2579:: 2571:: 2539:. 2519:: 2495:. 2475:: 2452:. 2422:: 2414:( 2385:. 2363:: 2333:. 2305:: 2278:. 2258:: 2231:. 2209:: 2183:. 2171:: 2148:. 2126:: 2099:. 2087:: 2079:: 2056:. 2032:: 2005:. 1977:: 1969:: 1942:. 1906:: 1879:) 1865:. 1832:. 1792:. 1778:: 1768:: 1741:. 1713:: 1690:. 1641:. 1619:: 1611:: 1579:. 1557:: 1530:. 1496:. 1475:" 1219:" 1063:, 729:. 576:/ 573:ə 570:r 567:d 561:h 558:ˈ 555:/ 551:( 27:.

Index

Lernaean Hydra
Hydra (disambiguation)

budding
Scientific classification
Edit this classification
Eukaryota
Animalia
Cnidaria
Hydrozoa
Anthoathecata
Hydridae
Hydra
Linnaeus
1758
Hydra oligactis
Hydra viridissima
Hydra vulgaris
/ˈhdrə/
HY-drə
genus
freshwater
hydrozoans
phylum
Cnidaria
temperate
tropical
Linnaeus
Hydra
Heracles

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