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Parietal eye

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stage (first-stage larva) have a single eye atop the head. The eye has a lens and senses the direction of light but can not resolve details. More sophisticated segmented eyes develop later on the sides of their heads, but the initial eye also stays for some time. Thus it is possible to say that, at
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have two parietal eyes, one that developed from the parapineal organ and the other from the pineal organ. These are one behind the other in the centre of the upper surface of the braincase. Because lampreys are among the most primitive of all living vertebrates, it is possible that was the original
161:, reported the results of his dissection of 29 species of lizards; he noted the presence of the same structure that Leydig had described. Spencer called it the pineal eye or parietal eye and noticed that it was associated with the 301:; during development, it divides into two bilaterally somewhat symmetric organs, which rotate their location to become a caudal pineal organ and a parapineal organ. In some species, the parietal eye protrudes through the 365:
to have both a pineal and a parapineal eye. In most vertebrates, the pineal organ forms the parietal eye, however, in lepidosaurs it is formed from the parapineal organ, which suggests that
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The third eye is much smaller than the main paired eyes; in living species, it is always covered by skin, and is usually not readily visible externally. The parietal eye is a part of the
393:, in humans, make up a portion of the rear of the skull, far from the eyes. To understand further, note that the parietal bones formed a part of the skull lying between the eyes in 823:"The Sixth Sense in Mammalian Forerunners: Variability of the Parietal Foramen and the Evolution of the Pineal Eye in South African Permo-Triassic Eutheriodont Therapsids" 146:. in 1872; He found cup-like protrusions under the middles of their brains. He believed the protrusions to be glandular and called them frontal organs (German 945: 618: 757: 1303: 602: 377:
The parietal eye of amphibians and reptiles appears relatively far forward in the skull; thus it may be surprising that the human
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Mayer, Georg (2006-12-01). "Structure and development of onychophoran eyes: What is the ancestral visual organ in arthropods?".
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lizard, probably had two parietal eyes, one that developed from the pineal organ and the other from the parapineal organ.
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condition among vertebrates, and may have allowed bottom-dwelling species to sense threats from above.
332:, have in their skulls sockets that appear to have held functional third eyes. The socket remains as a 229:, suggesting that it was lost during the course of the mammalian evolution due to it being useless in 83:
in some vertebrates. The eye is at the top of the head; is photoreceptive; and is associated with the
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Gundy, GC; Wurst, GZ (1976). "The occurrence of parietal eyes in recent Lacertilia (Reptilia)".
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Smith, Krister T.; Bhullar, Bhart-Anjan S.; Köhler, Gunther; Habersetzer, Jörg (2 April 2018).
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Spencer, Sir Baldwin (1885). "On the Presence and Structure of the Pineal Eye in Lacertilia".
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of the retina, and hypothesised that the pineal eye could be a primitive light-sensing organ (
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Dodt, Eberhard (1973). "The Parietal Eye (Pineal and Parietal Organs) of Lower Vertebrates".
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bridge the substantial distance between eyes and diencephalon. Likewise the pineal stalk of
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in many living amphibians and reptiles, although it has vanished in birds and mammals.
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some stage of development, crustaceans also have a "third eye". Some species, like the
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Benoit, Julien; Abdala, Fernando; Manger, Paul R.; Rubidge, Bruce S. (2016-03-17).
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animals. It is also absent in the ancestrally endothermic ("warm-blooded")
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Infectious diseases and pathology of reptiles : color atlas and text
487: 430: 426: 317: 290: 274: 80: 42: 1004: 27:(very small grey oval between the regular eyes) of a juvenile bullfrog ( 1621: 1518: 807: 447: 435: 422: 386: 246: 222: 202: 182: 1636: 1469: 1425: 1405: 460: 354: 321: 310: 305:. The parietal eye's way of detecting light differs from the use of 242: 234: 230: 226: 131: 1281: 965:"The pineal complex of reptiles: Physiological and behavioral roles" 799: 19: 1503: 1009:. Philadelphia, PA: Holt-Saunders International. pp. 471–473. 764:. European Molecular Biology Laboratory, heidelberg. Archived from 459:, retain the primary eye throughout all stages of their life. Most 329: 306: 1030:
Light-sensitive organs that evaginate from the diencephalon - NCBI
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Herpetology: An introductory biology of amphibians and reptiles
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Xiong, Wei-Hong; Solessio, Eduardo C.; Yau, King-Wai (1998).
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appears far away from this position, tucked away between the
302: 262: 238: 210: 189:). The organ has become popularly known as the "third eye". 174: 1041:
Zug, George; Vitt, Laurie Vitt; Caldwell, Janalee (2002).
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and basal amphibians, but have moved further back in
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organ or as a separate outgrowth of the roof of the
1005:Romer, Alfred Sherwood; Parsons, Thomas S. (1977). 409:arises, appears relatively further forward, as the 969:Ethology Ecology & Evolution - ETHOL ECOL EVOL 548:, University of California Press, pp. 32–84, 439:elongates very considerably during metamorphosis. 316:Many of the oldest fossil vertebrates, including 130:, dissected four species of European lizards—the 95:. The hole that contains the eye is known as the 1659: 277:, which can be divided into two major parts—the 57:Parietal eye of the Merrem's Madagascar swift ( 634: 192: 1297: 289:). The structures arise as a single anterior 126:Franz Leydig, a professor of zoology at the 524:. Berkeley: University of California Press. 442: 1304: 1290: 944:: CS1 maint: location missing publisher ( 785: 617:: CS1 maint: location missing publisher ( 401:. Likewise in the brain of the frog, the 253:, which may be grouped with archosaurs in 1138: 879: 838: 861: 581: 52: 36: 18: 862:Emerling, Christopher A. (2017-03-01). 600: 1660: 962: 689: 417:are far more prominent than the human 372: 103:, because it is often enclosed by the 1488:Evolution of color vision in primates 1311: 1285: 1236:Arthropod Structure & Development 1233: 1000: 998: 539: 516: 463:have one or more simple eyes, called 1213:Journal of morphology - Google Books 755: 722: 635:Wurtman, R. J.; Axelrod, J. (1965). 630: 628: 535: 533: 531: 241:. The parietal eye is also lost in 173:zoologist, found the pineal eye in 110:The parietal eye was discovered by 13: 995: 14: 1694: 661:10.1038/scientificamerican0765-50 625: 528: 510: 285:or, if it is photoreceptive, the 245:("cold-blooded") archosaurs like 221:but was present in their closest 197:The parietal eye is found in the 1377: 590:(40): 26–27 – via Sabinet. 1227: 1204: 1183: 1163: 1104: 1059: 1034: 1023: 963:Tosini, Gianluca (1997-10-01). 956: 904: 868:Molecular Biology and Evolution 855: 814: 604:Quarterly Journal of Microscopy 165:and the pineal stalk. In 1918, 779: 749: 716: 692:"The pineal: seat of the soul" 683: 594: 575: 261:, as lizards and tuatara are, 1: 1171:"FRONTAL AND PARIETAL BONES=" 989:10.1080/08927014.1997.9522875 827:Acta Palaeontologica Polonica 503: 313:in a normal vertebrate eye. 121: 7: 1416:Simple eye in invertebrates 1191:"Edible Frog Brain Clipart" 733:10.1007/978-3-642-65495-4_4 725:Visual Centers in the Brain 493:Simple eye in invertebrates 476: 369:re-evolved the pineal eye. 193:Presence in various animals 91:and hormone production for 10: 1699: 1612:Infrared sensing in snakes 756:Uetz, Peter (2003-10-07). 540:Eakin, Richard M. (1973), 268: 114:, in 1872, from work with 1678:Sensory organs in animals 1584: 1496: 1483:Evolution of color vision 1468: 1386: 1375: 1317: 1256:10.1016/j.asd.2006.06.003 1140:10.1016/j.cub.2018.02.021 762:The EMBL reptile database 554:10.1525/9780520326323-004 607:. London. pp. 1–76. 582:Flemming, A. F. (1991). 443:Analogs in other species 690:Pearce, J.M.S. (2022). 421:, which is part of the 201:, most lizards, frogs, 140:) and three species of 30:Lithobates catesbeianus 16:Part of the epithalamus 840:10.4202/app.00219.2015 788:Journal of Herpetology 469:, between their main, 157:, an anatomist at the 155:Walter Baldwin Spencer 128:University of TĂĽbingen 64: 50: 34: 1617:Monocular deprivation 1576:Underwater camouflage 1571:Structural coloration 1549:Disruptive coloration 948:) CS1 maint: others ( 881:10.1093/molbev/msw265 696:Hektoen International 265:lack a parietal eye. 89:circadian rhythmicity 56: 40: 22: 1597:Blindness in animals 1529:Counter-illumination 1478:Evolution of the eye 413:are smaller but the 411:cerebral hemispheres 159:University of Oxford 1248:2006ArtSD..35..231M 1131:2018CBio...28E1101S 1125:(7): 1101–1107.e2. 1072:Nature Neuroscience 1007:The Vertebrate Body 981:1997EtEcE...9..313T 653:1965SciAm.213a..50W 641:Scientific American 373:Comparative anatomy 79:) is a part of the 47:Anolis carolinensis 1544:Deimatic behaviour 637:"The pineal gland" 429:, commissure, and 399:higher vertebrates 361:is the only known 217:. It is absent in 87:, which regulates 65: 51: 35: 1655: 1654: 1647:Visual perception 1642:Underwater vision 1607:Feature detection 1602:Eyespot apparatus 1561:Eyespot (mimicry) 1509:Animal coloration 1312:Vision in animals 1052:978-0-12-782622-6 1016:978-0-03-910284-5 923:978-1-4200-0403-8 563:978-0-520-32632-3 405:, from which the 1690: 1673:Endocrine system 1627:Palpebral (bone) 1460:Schizochroal eye 1381: 1306: 1299: 1292: 1283: 1282: 1276: 1275: 1231: 1225: 1224: 1222: 1221: 1208: 1202: 1201: 1199: 1198: 1187: 1181: 1180: 1178: 1177: 1167: 1161: 1160: 1142: 1108: 1102: 1101: 1099: 1098: 1063: 1057: 1056: 1038: 1032: 1027: 1021: 1020: 1002: 993: 992: 960: 954: 953: 943: 935: 908: 902: 901: 883: 859: 853: 852: 842: 818: 812: 811: 783: 777: 776: 774: 773: 758:"Sphenodontidae" 753: 747: 746: 720: 714: 713: 711: 710: 687: 681: 680: 632: 623: 622: 616: 608: 598: 592: 591: 579: 573: 572: 571: 570: 537: 526: 525: 514: 425:. In humans the 363:jawed vertebrate 326:crossopterygians 257:. Despite being 163:parietal foramen 101:parietal foramen 93:thermoregulation 60:Oplurus cyclurus 1698: 1697: 1693: 1692: 1691: 1689: 1688: 1687: 1658: 1657: 1656: 1651: 1580: 1492: 1464: 1382: 1373: 1313: 1310: 1280: 1279: 1232: 1228: 1219: 1217: 1210: 1209: 1205: 1196: 1194: 1189: 1188: 1184: 1175: 1173: 1169: 1168: 1164: 1118:Current Biology 1109: 1105: 1096: 1094: 1064: 1060: 1053: 1039: 1035: 1028: 1024: 1017: 1003: 996: 961: 957: 937: 936: 924: 910: 909: 905: 860: 856: 819: 815: 800:10.2307/1562791 784: 780: 771: 769: 754: 750: 743: 721: 717: 708: 706: 688: 684: 633: 626: 610: 609: 599: 595: 580: 576: 568: 566: 564: 538: 529: 515: 511: 506: 479: 445: 395:sarcopterygians 383:corpus callosum 375: 271: 225:relatives, the 195: 137:Anguis fragilis 124: 17: 12: 11: 5: 1696: 1686: 1685: 1680: 1675: 1670: 1653: 1652: 1650: 1649: 1644: 1639: 1634: 1629: 1624: 1619: 1614: 1609: 1604: 1599: 1594: 1588: 1586: 1585:Related topics 1582: 1581: 1579: 1578: 1573: 1568: 1563: 1558: 1557: 1556: 1546: 1541: 1536: 1534:Countershading 1531: 1526: 1521: 1516: 1511: 1506: 1500: 1498: 1494: 1493: 1491: 1490: 1485: 1480: 1474: 1472: 1466: 1465: 1463: 1462: 1457: 1452: 1450:Holochroal eye 1447: 1446: 1445: 1440: 1430: 1429: 1428: 1418: 1413: 1408: 1403: 1398: 1392: 1390: 1384: 1383: 1376: 1374: 1372: 1371: 1370: 1369: 1364: 1359: 1349: 1344: 1339: 1334: 1329: 1323: 1321: 1315: 1314: 1309: 1308: 1301: 1294: 1286: 1278: 1277: 1242:(4): 231–245. 1226: 1203: 1182: 1162: 1103: 1078:(5): 359–365. 1058: 1051: 1033: 1022: 1015: 994: 955: 922: 903: 874:(3): 666–676. 854: 833:(4): 777–789. 813: 794:(2): 113–121. 778: 748: 741: 715: 682: 624: 593: 574: 562: 527: 508: 507: 505: 502: 501: 500: 498:Vision in fish 495: 490: 485: 478: 475: 444: 441: 391:parietal bones 374: 371: 338:parietal bones 270: 267: 194: 191: 123: 120: 105:parietal bones 97:pineal foramen 15: 9: 6: 4: 3: 2: 1695: 1684: 1681: 1679: 1676: 1674: 1671: 1669: 1666: 1665: 1663: 1648: 1645: 1643: 1640: 1638: 1635: 1633: 1630: 1628: 1625: 1623: 1620: 1618: 1615: 1613: 1610: 1608: 1605: 1603: 1600: 1598: 1595: 1593: 1592:Animal senses 1590: 1589: 1587: 1583: 1577: 1574: 1572: 1569: 1567: 1564: 1562: 1559: 1555: 1552: 1551: 1550: 1547: 1545: 1542: 1540: 1537: 1535: 1532: 1530: 1527: 1525: 1524:Chromatophore 1522: 1520: 1517: 1515: 1512: 1510: 1507: 1505: 1502: 1501: 1499: 1495: 1489: 1486: 1484: 1481: 1479: 1476: 1475: 1473: 1471: 1467: 1461: 1458: 1456: 1453: 1451: 1448: 1444: 1441: 1439: 1436: 1435: 1434: 1431: 1427: 1424: 1423: 1422: 1421:Mammalian eye 1419: 1417: 1414: 1412: 1409: 1407: 1404: 1402: 1399: 1397: 1396:Arthropod eye 1394: 1393: 1391: 1389: 1385: 1380: 1368: 1365: 1363: 1360: 1358: 1355: 1354: 1353: 1350: 1348: 1345: 1343: 1340: 1338: 1335: 1333: 1330: 1328: 1325: 1324: 1322: 1320: 1316: 1307: 1302: 1300: 1295: 1293: 1288: 1287: 1284: 1273: 1269: 1265: 1261: 1257: 1253: 1249: 1245: 1241: 1237: 1230: 1215: 1214: 1207: 1193:. Etc.usf.edu 1192: 1186: 1172: 1166: 1158: 1154: 1150: 1146: 1141: 1136: 1132: 1128: 1124: 1120: 1119: 1114: 1107: 1093: 1089: 1085: 1081: 1077: 1073: 1069: 1062: 1054: 1048: 1044: 1037: 1031: 1026: 1018: 1012: 1008: 1001: 999: 990: 986: 982: 978: 974: 970: 966: 959: 951: 947: 941: 933: 929: 925: 919: 915: 914: 907: 899: 895: 891: 887: 882: 877: 873: 869: 865: 858: 850: 846: 841: 836: 832: 828: 824: 817: 809: 805: 801: 797: 793: 789: 782: 768:on 2007-02-21 767: 763: 759: 752: 744: 742:9783642654978 738: 734: 730: 726: 719: 705: 701: 697: 693: 686: 678: 674: 670: 666: 662: 658: 654: 650: 646: 642: 638: 631: 629: 620: 614: 606: 605: 597: 589: 585: 584:"A third eye" 578: 565: 559: 555: 551: 547: 546:The Third Eye 543: 542:"3 Structure" 536: 534: 532: 523: 522:The Third Eye 519: 513: 509: 499: 496: 494: 491: 489: 486: 484: 483:Arthropod eye 481: 480: 474: 472: 471:compound eyes 468: 467: 462: 458: 453: 449: 440: 438: 437: 432: 428: 424: 420: 419:mesencephalon 416: 412: 408: 404: 400: 396: 392: 388: 384: 380: 370: 368: 364: 360: 356: 353:, an extinct 352: 351: 345: 341: 339: 335: 331: 327: 323: 319: 314: 312: 308: 304: 300: 296: 292: 288: 284: 280: 276: 266: 264: 260: 256: 255:Archelosauria 252: 248: 244: 240: 236: 232: 228: 224: 220: 216: 212: 208: 204: 200: 190: 188: 187:photoreceptor 184: 180: 176: 172: 168: 167:Nils Holmgren 164: 160: 156: 151: 149: 145: 144: 139: 138: 133: 129: 119: 117: 113: 108: 106: 102: 98: 94: 90: 86: 82: 78: 74: 70: 62: 61: 55: 48: 44: 39: 32: 31: 26: 23:The parietal 21: 1455:Parietal eye 1454: 1401:Compound eye 1239: 1235: 1229: 1218:. Retrieved 1212: 1206: 1195:. Retrieved 1185: 1174:. Retrieved 1165: 1122: 1116: 1106: 1095:. Retrieved 1084:10.1038/1570 1075: 1071: 1061: 1042: 1036: 1025: 1006: 972: 968: 958: 912: 906: 871: 867: 857: 830: 826: 816: 791: 787: 781: 770:. Retrieved 766:the original 761: 751: 724: 718: 707:. Retrieved 695: 685: 647:(1): 50–60. 644: 640: 603: 596: 587: 577: 567:, retrieved 545: 521: 512: 465: 457:brine shrimp 446: 434: 407:pineal stalk 403:diencephalon 379:pineal gland 376: 366: 358: 348: 342: 336:between the 328:, and early 318:ostracoderms 315: 299:diencephalon 286: 283:parietal eye 282: 272: 247:crocodilians 196: 162: 152: 147: 141: 135: 125: 112:Franz Leydig 109: 100: 96: 85:pineal gland 76: 72: 69:parietal eye 68: 66: 58: 46: 28: 1632:Pseudopupil 1514:Aposematism 1433:Mollusc eye 518:Eakin, R. M 488:Mollusc eye 448:Crustaceans 431:optic nerve 427:optic tract 415:optic lobes 389:. Also the 291:evagination 275:epithalamus 259:lepidosaurs 243:ectothermic 231:endothermic 203:salamanders 81:epithalamus 43:green anole 1662:Categories 1622:Ommatidium 1554:coincident 1519:Camouflage 1497:Coloration 1438:cephalopod 1332:Chameleons 1220:2011-09-08 1197:2011-09-08 1176:2011-09-08 1097:2007-02-22 975:(4): 314. 772:2007-02-22 709:2023-03-28 569:2023-03-28 504:References 461:arthropods 436:Petromyzon 423:brain stem 387:cerebellum 322:placoderms 311:cone cells 235:archosaurs 227:therapsids 205:, certain 183:cone cells 148:Stirnorgan 77:pineal eye 1637:Rhopalium 1470:Evolution 1443:gastropod 1411:Eye shine 1406:Eagle eye 1337:Dinosaurs 1264:1467-8039 1149:0960-9822 940:cite book 932:317753687 890:1537-1719 849:0567-7920 704:2155-3017 669:0036-8733 613:cite book 330:tetrapods 307:rod cells 287:third eye 279:epiphysis 249:, and in 207:bony fish 153:In 1886, 132:slow worm 122:Discovery 73:third eye 1504:Albinism 1272:18089073 1157:29614279 1092:10196524 898:27940498 677:14298722 520:(1973). 477:See also 452:nauplius 344:Lampreys 237:such as 215:lampreys 1668:Lizards 1566:Mimicry 1539:Crypsis 1352:Mammals 1244:Bibcode 1127:Bibcode 977:Bibcode 808:1562791 649:Bibcode 450:at the 355:varanid 334:foramen 293:of the 269:Anatomy 251:turtles 223:extinct 219:mammals 199:tuatara 179:dogfish 171:Swedish 143:Lacerta 116:lizards 1357:horses 1319:Vision 1270:  1262:  1216:. 1887 1155:  1147:  1090:  1049:  1013:  930:  920:  896:  888:  847:  806:  739:  702:  675:  667:  560:  466:ocelli 367:Saniwa 359:Saniwa 350:Saniwa 295:pineal 263:snakes 213:, and 211:sharks 41:Adult 1426:human 1347:Toads 1327:Birds 804:JSTOR 588:Culna 303:skull 239:birds 175:frogs 1388:Eyes 1367:cats 1362:dogs 1342:Fish 1268:PMID 1260:ISSN 1153:PMID 1145:ISSN 1088:PMID 1047:ISBN 1011:ISBN 950:link 946:link 928:OCLC 918:ISBN 894:PMID 886:ISSN 845:ISSN 737:ISBN 700:ISSN 673:PMID 665:ISSN 619:link 558:ISBN 385:and 309:and 177:and 169:, a 1683:Eye 1252:doi 1135:doi 1080:doi 985:doi 876:doi 835:doi 796:doi 729:doi 657:doi 645:213 550:doi 150:). 99:or 25:eye 1664:: 1266:. 1258:. 1250:. 1240:35 1238:. 1151:. 1143:. 1133:. 1123:28 1121:. 1115:. 1086:. 1074:. 1070:. 997:^ 983:. 971:. 967:. 942:}} 938:{{ 926:. 892:. 884:. 872:34 870:. 866:. 843:. 831:61 829:. 825:. 802:. 792:10 790:. 760:. 735:. 698:. 694:. 671:. 663:. 655:. 643:. 639:. 627:^ 615:}} 611:{{ 586:. 556:, 544:, 530:^ 473:. 324:, 320:, 209:, 118:. 107:. 75:, 67:A 1305:e 1298:t 1291:v 1274:. 1254:: 1246:: 1223:. 1200:. 1179:. 1159:. 1137:: 1129:: 1100:. 1082:: 1076:1 1055:. 1019:. 991:. 987:: 979:: 973:9 952:) 934:. 900:. 878:: 851:. 837:: 810:. 798:: 775:. 745:. 731:: 712:. 679:. 659:: 651:: 621:) 552:: 134:( 71:( 45:( 33:)

Index


eye
Lithobates catesbeianus

green anole

Oplurus cyclurus
epithalamus
pineal gland
circadian rhythmicity
thermoregulation
parietal bones
Franz Leydig
lizards
University of TĂĽbingen
slow worm
Anguis fragilis
Lacerta
Walter Baldwin Spencer
University of Oxford
parietal foramen
Nils Holmgren
Swedish
frogs
dogfish
cone cells
photoreceptor
tuatara
salamanders
bony fish

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