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Megapterygius

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is a medium-sized mosasaur with an estimated skull length of 0.8 metres (2.6 ft) and a body length of approximately 6 metres (20 ft). Both the front and hind flippers are longer than the skull. This feature is not seen in any other mosasauroid with paddle-like limbs. Furthermore, the hind
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Konishi, Takuya; Ohara, Masaaki; Misaki, Akihiro; Matsuoka, Hiroshige; Street, Hallie P.; Caldwell, Michael W. (2023). "A new derived mosasaurine (Squamata: Mosasaurinae) from south-western Japan reveals unexpected postcranial diversity among hydropedal mosasaurs".
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holotype, based on related taxa, it likely had a crescent-shaped tail fin that could have aided in propulsion and fast turning. Based on the combination of all of these features and the large size of the flippers, Konishi
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of Japan. The specimen consists of a partial skull, a complete cervical and dorsal vertebral series with more than 40 vertebrae, ribs, both front flippers, and the left hind flipper.
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dorsal vertebrae exhibit an abrupt change in orientation, with at least five neural spines projecting anterodorsally. This is also seen in some
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was capable of rapid pitch control (rotation) and braking. Skull part around eye socket is slightly wide horizontally, which suggests that had
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would have been a capable hunter of large groups of small prey items that were hard to capture, like schools of fish.
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of the front flippers, allowing for quick maneuvering. The femoral head is well-rounded and almost circular in
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is saddle-shaped and mediolaterally thick. This likely indicates a high range of motion for both
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is "Wakayama Soryu" (和歌山滄竜), which translates to "Wakayama blue dragon". The word "Soryu" (
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flippers are even larger than the front flippers, which is otherwise only seen in
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as a new genus and species of mosasaurine based on these fossil remains. The
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represents the first published evidence for such a structure in mosasaurs.
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holotype, suggesting it was scavenged by these sharks after it died.
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After 24: 1515:10.15080/agcjchikyukagaku.75.2_147 1496: 1357:shark teeth were found around the 320:mosasaur from the Late Cretaceous 25: 2387: 1436: 468: 2263: 2262: 1804: 1349:) have also been found near the 153: 56: 1296: 1245: 1490: 1462: 415: 13: 1: 2376:Fossil taxa described in 2023 2242:Timeline of mosasaur research 1554: 1414:10.1080/14772019.2023.2277921 1364: 312:(meaning "large wing") is an 1346:Gigantocapulus problematicus 7: 1499:"博物館と発掘現場で体感する日本一のモササウルス化石" 368:Megapterygius wakayamaensis 291:Megapterygius wakayamaensis 18:Megapterygius wakayamaensis 10: 2392: 1266:view, which suggests that 27:Extinct genus of mosasaurs 2289: 2260: 2234: 2112:Related groups and genera 2111: 2073: 2038: 2011: 1966: 1925: 1891: 1871: 1813: 1802: 1752: 1725: 1677: 1594: 1562: 1103: 1088: 1081: 1066: 1059: 1042: 1035: 1017: 1010: 977: 960: 953: 946: 929: 922: 905: 898: 874: 859: 852: 845: 830: 823: 799: 781: 774: 767: 725: 710: 703: 685: 678: 666:Prognathodon waiparaensis 663: 656: 641: 634: 617: 610: 595: 577: 570: 553: 546: 483:Konishi (2023) recovered 287: 280: 150:Scientific classification 148: 139: 130: 34: 2247:List of mosasaur genera 378:", is derived from the 1308:Pachydiscus awajiensis 1260:protraction/retraction 877:Prognathodon saturator 802:Globidens alabamaensis 503:to a clade containing 480: 404:The Japanese name for 2328:Paleobiology Database 1340:Globularia izumiensis 1091:Mosasaurus hoffmannii 1069:Mosasaurus lemonnieri 862:Prognathodon overtoni 529:phylogenetic analyses 476: 385:, meaning large, and 1250:The humeral head of 598:Prognathodon solvayi 334:Discovery and naming 144:compared to a human 1406:2023JSPal..2177921K 1256:adduction/abduction 728:Clidastes liodontus 713:Clidastes propython 644:Prognathodon kianda 355:Wakayama Prefecture 1106:Mosasaurus maximus 833:Prognathodon rapax 481: 2361:Mosasaurs of Asia 2343: 2342: 2283:Taxon identifiers 2274: 2273: 2107: 2106: 2007: 2006: 1950:Plesioplatecarpus 1893:Plioplatecarpinae 1867: 1866: 1800: 1799: 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restoration 327:M. wakayamaensis 322:Toyajo Formation 267: 260: 247: 234: 221: 158: 157: 135: 125: 55: 40:Temporal range: 32: 31: 21: 2391: 2390: 2386: 2385: 2384: 2382: 2381: 2380: 2346: 2345: 2344: 2339: 2331: 2326: 2318: 2313: 2304: 2303: 2298: 2285: 2275: 2270: 2256: 2230: 2218:Portunatasaurus 2154:Dolichosauridae 2119:Aigialosauridae 2103: 2075:Yaguarasaurinae 2069: 2034: 2003: 1962: 1957:Plioplatecarpus 1936:Latoplatecarpus 1921: 1887: 1873:Russellosaurina 1863: 1858:Phosphorosaurus 1829: 1809: 1796: 1748: 1721: 1673: 1590: 1558: 1553: 1523: 1522: 1497:正顕, 小原 (2021). 1495: 1491: 1482: 1480: 1474:モササウルス発掘プロジェクト| 1468: 1467: 1463: 1449: 1445: 1444: 1437: 1389: 1372: 1367: 1299: 1289:speculate that 1277:Phosphorosaurus 1248: 1243: 1234: 1225: 1216: 1207: 1198: 1189: 1180: 1171: 1162: 1153: 1144: 1135: 1126: 1117: 1000: 984: 888: 813: 757: 748: 739: 471: 418: 336: 301: 294: 266: 258: 245: 232: 219: 152: 126: 124: 123: 122: 121: 116: 111: 106: 101: 96: 91: 86: 81: 76: 71: 66: 61: 50: 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1709:Igdamanosaurus 1705: 1698: 1691: 1683: 1681: 1672: 1671: 1664: 1657: 1650: 1643: 1636: 1629: 1622: 1615: 1608: 1600: 1598: 1592: 1591: 1589: 1588: 1582: 1576: 1570: 1563: 1560: 1559: 1552: 1551: 1544: 1537: 1529: 1521: 1520: 1509:(2): 147–150. 1489: 1461: 1435: 1369: 1368: 1366: 1363: 1298: 1295: 1247: 1244: 1240: 1239: 1236: 1235: 1231: 1230: 1227: 1226: 1222: 1221: 1218: 1217: 1213: 1212: 1209: 1208: 1204: 1203: 1200: 1199: 1195: 1194: 1191: 1190: 1186: 1185: 1182: 1181: 1177: 1176: 1173: 1172: 1168: 1167: 1164: 1163: 1159: 1158: 1155: 1154: 1150: 1149: 1146: 1145: 1141: 1140: 1137: 1136: 1132: 1131: 1128: 1127: 1123: 1122: 1119: 1118: 1114: 1113: 1110: 1109: 1102: 1099: 1098: 1095: 1094: 1087: 1082: 1080: 1077: 1076: 1073: 1072: 1065: 1060: 1058: 1055: 1054: 1051: 1050: 1041: 1036: 1034: 1031: 1030: 1027: 1026: 1016: 1011: 1009: 1006: 1005: 1002: 1001: 997: 996: 993: 992: 976: 973: 972: 969: 968: 959: 954: 952: 947: 945: 942: 941: 938: 937: 928: 923: 921: 918: 917: 914: 913: 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1500: 1493: 1479:(in Japanese) 1478: 1477: 1471: 1465: 1457: 1456: 1448: 1442: 1440: 1431: 1427: 1423: 1419: 1415: 1411: 1407: 1403: 1399: 1395: 1387: 1385: 1383: 1381: 1379: 1377: 1375: 1370: 1362: 1360: 1359:Megapterygius 1356: 1352: 1351:Megapterygius 1348: 1347: 1342: 1341: 1336: 1332: 1331: 1326: 1325: 1320: 1319: 1314: 1310: 1309: 1304: 1294: 1292: 1291:Megapterygius 1288: 1283: 1282:Megapterygius 1279: 1278: 1273: 1269: 1268:Megapterygius 1265: 1261: 1257: 1253: 1252:Megapterygius 1238: 1237: 1229: 1228: 1220: 1219: 1211: 1210: 1202: 1201: 1193: 1192: 1184: 1183: 1175: 1174: 1166: 1165: 1157: 1156: 1148: 1147: 1139: 1138: 1130: 1129: 1121: 1120: 1112: 1111: 1108: 1107: 1101: 1100: 1097: 1096: 1093: 1092: 1086: 1085: 1079: 1078: 1075: 1074: 1071: 1070: 1064: 1063: 1057: 1056: 1053: 1052: 1049: 1048: 1047: 1040: 1039: 1033: 1032: 1029: 1028: 1025: 1024: 1023:missouriensis 1022: 1015: 1014: 1008: 1007: 1004: 1003: 995: 994: 991: 988: 983: 982: 975: 974: 971: 970: 967: 966: 965: 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1934: 1916:Sarabosaurus 1914: 1909:Ectenosaurus 1907: 1902:Angolasaurus 1900: 1882:Haasiasaurus 1880: 1856: 1849: 1842: 1822: 1815:Halisaurinae 1789: 1782: 1775: 1770:Eremiasaurus 1768: 1761: 1741: 1736:Prognathodon 1734: 1714: 1707: 1700: 1693: 1686: 1679:Globidensini 1666: 1659: 1653: 1652: 1645: 1638: 1631: 1626:Gnathomortis 1624: 1617: 1610: 1605:Amphekepubis 1603: 1596:Mosasaurinae 1506: 1502: 1492: 1481:. Retrieved 1473: 1464: 1453: 1397: 1393: 1358: 1350: 1344: 1338: 1328: 1324:Apiotrigonia 1322: 1316: 1306: 1300: 1297:Paleoecology 1290: 1286: 1281: 1275: 1267: 1251: 1249: 1246:Paleobiology 1105: 1104: 1090: 1089: 1068: 1067: 1044: 1043: 1019: 1018: 986: 979: 978: 962: 961: 932: 931: 930: 907: 906: 876: 875: 861: 860: 832: 831: 801: 800: 783: 782: 727: 726: 712: 711: 687: 686: 665: 664: 643: 642: 621:Eremiasaurus 619: 618: 597: 596: 581:Prognathodon 579: 578: 555: 554: 543:Mosasaurinae 522: 516: 510: 504: 501:sister taxon 497:Mosasauridae 484: 482: 462: 454: 438: 432: 425: 420: 419: 405: 403: 398: 390: 386: 382: 375: 372:generic name 367: 361: 359: 339: 337: 326: 325: 308: 307: 306: 297: 290: 289: 282:Type species 269: 262: 261: 249:Mosasaurinae 236:Mosasauridae 213: 141: 35: 29: 2211:Judeasaurus 2204:Adriosaurus 2188:Pontosaurus 2160:Coniasaurus 2139:Komensaurus 2132:Carsosaurus 2084:Romeosaurus 2029:Tethysaurus 1998:Selmasaurus 1943:Platecarpus 1835:Halisaurini 1791:Plotosaurus 1777:Moanasaurus 1754:Mosasaurini 1633:Jormungandr 1619:Dallasaurus 1301:Fossils of 1046:Plotosaurus 987:Moanasaurus 964:Moanasaurus 557:Dallasaurus 524:Plotosaurus 506:Moanasaurus 489:mosasaurine 416:Description 318:mosasaurine 242:Subfamily: 2350:Categories 2306:Q123766172 2181:Primitivus 2064:Tylosaurus 2050:Kaikaifilu 1851:Halisaurus 1784:Mosasaurus 1688:Carinodens 1668:Stelladens 1640:Kourisodon 1483:2023-12-13 1476:和歌山県立自然博物館 1455:和歌山県立自然博物館 1365:References 1355:squaliform 1335:gastropods 1333:sp.), and 1330:Inoceramus 1021:Mosasaurus 981:Rikisaurus 787:dakotensis 521:spp., and 518:Mosasaurus 512:Rikisaurus 451:dorsal fin 447:delphinoid 427:Tylosaurus 351:Mt. Toyajo 345:specimen, 223:Mosasauria 2174:Kaganaias 1991:Khinjaria 1844:Eonatator 1824:Pluridens 1695:Globidens 1612:Clidastes 1566:Kingdom: 1556:Mosasaurs 1430:266284597 1422:1477-2019 1318:Nanonavis 1303:ammonites 785:Globidens 689:Clidastes 533:cladogram 499:, as the 443:posterior 441:holotype 387:pterygion 365:described 316:genus of 173:Kingdom: 167:Eukaryota 2320:11934700 2300:Wikidata 2268:Category 1716:Xenodens 1586:Squamata 1580:Reptilia 1574:Chordata 1572:Phylum: 1568:Animalia 1327:sp. and 1313:bivalves 1264:proximal 493:squamate 459:rib cage 343:holotype 296:Konishi 268:Konishi 229:Family: 207:Squamata 197:Reptilia 187:Chordata 183:Phylum: 177:Animalia 163:Domain: 140:Size of 51:72  1584:Order: 1578:Class: 1458:. 2023. 1402:Bibcode 535:below: 437:of the 314:extinct 300:., 2023 255:Genus: 203:Order: 193:Class: 120:↓ 2333:483187 1647:Liodon 1428:  1420:  1287:et al. 583:currii 495:clade 393:. The 362:et al. 2315:IRMNG 1450:(PDF) 1426:S2CID 1400:(1). 1321:sp., 487:as a 383:mégas 298:et al 270:et al 214:Clade 1503:地球科学 1418:ISSN 1258:and 433:The 347:WMNH 338:The 274:2023 59:PreꞒ 1511:doi 1410:doi 1311:), 374:, " 353:in 272:., 48:), 2352:: 2330:: 2317:: 2302:: 1507:75 1505:. 1501:. 1472:. 1452:. 1438:^ 1424:. 1416:. 1408:. 1398:21 1396:. 1373:^ 1343:, 515:, 509:, 430:. 216:: 109:Pg 53:Ma 2047:? 1548:e 1541:t 1534:v 1517:. 1513:: 1486:. 1432:. 1412:: 1404:: 1337:( 1315:( 1305:( 989:) 985:( 410:滄 397:" 288:† 259:† 246:† 233:† 220:† 114:N 104:K 99:J 94:T 89:P 84:C 79:D 74:S 69:O 64:Ꞓ 44:( 20:)

Index

Megapterygius wakayamaensis
Late Cretaceous
Maastrichtian
Ma
PreꞒ

O
S
D
C
P
T
J
K
Pg
N

Scientific classification
Edit this classification
Eukaryota
Animalia
Chordata
Reptilia
Squamata
Mosasauria
Mosasauridae
Mosasaurinae
Megapterygius
2023
Type species

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