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Pakicetidae

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147: 1881: 514: 538:, are present in pakicetids. Pakicetid cervical vertebrae are longer than in late Eocene whales, the thoracic vertebrae increase in size from the neck backwards, and the lumbar and caudal vertebrae are longer than in modern cetaceans (but still shorter than in some extinct cetaceans with undulating spines.) Motion in the spine of pakicetids was further reduced by the 127: 560:
are absent in the long and slender humeri like in cursorial animals but unlike other Eocene cetaceans. Pakicetid elbows are rigid hinge joints like in running mammals and the forearms are not flattened like in truly aquatic cetaceans. In the pakicetid pelvis, the innominates are large and the ischia
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Pakicetids have been found in or near river deposits in northern Pakistan and northwestern India, a region which was probably arid with only temporary streams when these animals lived there. No pakicetids have been found in marine deposits, and they were apparently terrestrial or freshwater animals.
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morphology and microstructural features suggest that pakicetids were adapted to an aquatic lifestyle which included bottom wading, paddling, and undulatory swimming, but probably not sustained running. Isotopic evidence indicate Pakicetids spent a considerable part of their life in freshwater and
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in 1981. During the following two decades, more research resulted in additional pakicetid cranial material and by 2001 postcranial material for the family had been described. Though all parts of pakicetid postcrania are known, no complete skeleton from a single individual has been recovered. The
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is small and comparable in size to those of extant land mammals and the acoustic mandibular fat pad characteristic of later whales was obviously not present. The lateral wall of the mandible is also relatively thick in pakicetids, further preventing sound transmission through the jaw. The
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where fossils from all three genera have been found. However, this site is so littered with bones that identifying bones from a single individual is impossible, and pakicetid skeletons are consequently composites of bones from several individuals.
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Their long limbs and small hands and feet also indicate they were poor swimmers. Their bones are heavy and compact and were probably used as ballast; they clearly indicate pakicetids were not fast runners notwithstanding their otherwise
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which is firmly attached to the skull leaving no space for isolating air sinuses, effectively preventing directional hearing in water. Pakicetids most likely used bone conduction for hearing in water.
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Gingerich, Philip D. (2003). "Land-to-sea transition in early whales: evolution of Eocene Archaeoceti (Cetacea) in relation to skeletal proportions and locomotion of living semiaquatic mammals".
319:. Robert West was the first to identify pakicetids as cetaceans in 1980 and, after discovering a braincase, Phillip Gingerich and Donald Russell described the genus 1984: 339:
morphology. Most likely, pakicetids lived in or near bodies of freshwater and their diet could have included both land animals and aquatic organisms. During the
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In 2001, it was concluded by Thiwissen et al. that "pakicetids were terrestrial mammals, no more amphibious than a tapir." According to them, none of the
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Paläontologische und geologische Untersuchungen im Tertiär von Pakistan. 2. Die mitteleocänen Säugetiere von Ganda Kas bei Basal in Nordwest-Pakistan
1971: 1320: 2063: 484:, etcetera) similar to those in living land mammals and most likely used normal land mammal hearing in air. In the pakicetid mandible, the 1078:; Hussain, S. T. (1998). "Systematic review of the Pakicetidae, Early and middle Eocene Cetacea (Mammalia) from Pakistan and India". 2053: 1106: 493:
in pakicetid ears is similar to those in all cetaceans, with a relatively thin lateral wall and thickened medial part known as the
1174: 831:; Hussain, S. T. (2009). "New middle Eocene archaeocetes (Cetacea: Mammalia) from the Kuldana Formation of northern Pakistan". 556:
et al., the pakicetid scapulae have large supraspinous fossae with small acromions, in contrast to other cetaceans. The
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West, Robert M (1980). "Middle Eocene large mammal assemblage with Tethyan affinities, Ganda Kas region, Pakistan".
549:. The sacral vertebrae are fused and the sacroiliac joints present like in land mammals and amphibious cetaceans. 1313: 906: 469: 982: 803: 936:, A New Archaeocete (Mammalia, Cetacea) from the Early-Middle Eocene Kuldana Formation of Kohat (Pakistan)" 1901: 711: 931: 2010: 809: 315:, but at the time they did not recognize it as a cetacean, identifying it, instead, it as a fish-eating 2048: 1958: 1884: 1306: 1249: 1189: 1128: 840: 425: 565:. Hindlimb features that all more reminiscent of running and jumping animals than swimming animals. 557: 376: 562: 351:
land mass and therefore an ideal habitat for the evolution and diversification of the Pakicetids.
1278: 1221: 1129:"The Early Radiations of Cetacea (Mammalia): Evolutionary Pattern and Developmental Correlations" 994: 918: 864: 527: 485: 386: 362: 141: 2015: 1012:"Sound transmission in archaic and modern whales: Anatomical adaptations for underwater hearing" 1997: 1444: 1286: 1213: 1205: 1151: 1112: 1102: 1033: 986: 950: 910: 881: 856: 327: 2025: 2002: 1989: 1939: 1147: 1257: 1197: 1143: 1061: 1023: 978: 902: 848: 380: 283: 1481: 1261: 1253: 1193: 844: 1797: 1698: 1501: 1170: 1124: 1091: 1075: 1045: 1007: 828: 553: 539: 531: 490: 417: 298:. Unlike modern cetaceans, they had well developed limbs and were capable of walking. 2042: 1563: 1552: 1524: 1453: 1433: 1410: 1399: 969:
Madar, S. I. (2007). "The postcranial skeleton of early Eocene pakicetid cetaceans".
596: 502: 498: 481: 446: 434: 311: 269: 77: 998: 922: 868: 1831: 1806: 1730: 1707: 1606: 1592: 1583: 1538: 1531: 1492: 1460: 1225: 1175:"Skeletons of terrestrial cetaceans and the relationship of whales to artiodactyls" 542: 535: 523:
Interpretations of pakicetid habitat and locomotion behaviour varies considerably:
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cheek teeth adapted for shearing with reentrant grooves on the anterior surfaces
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are longer than the ilia. The pakicetid tibiae are long with a short
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Contributions from the Museum of Paleontology, the Museum of Michigan
406: 340: 188: 168: 39: 1895: 1050:"From Land to Water: the Origin of Whales, Dolphins, and Porpoises" 512: 473: 1963: 1899: 1302: 1048:; Cooper, Lisa Noelle; George, John C.; Bajpai, Sunil (2009). 776: 907:
10.1666/0094-8373(2003)029<0429:ltiewe>2.0.co;2
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pakicetid goldmine is the "H-GSP Locality 62" site in the
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10.1666/0022-3360(2007)81[176:TPSOEE]2.0.CO;2
1010:; Bajpai, Sunil; Hussain, Taseer; Kumar, Kishor (2007). 361:
traits (derived traits shared by several taxa) found in
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Dehm, Richard; Oettingen-Spielberg, Therese zu (1958).
611: 601: 306: 1173:; Williams, E. M.; Roe, L. J.; Hussain, S. T. (2001). 689: 679: 347:
was an island-continent off the coastal region of the
242: 1908: 1830: 1796: 1706: 1697: 1582: 1562: 1500: 1491: 1443: 1409: 1375: 391:long and gracile limbs featuring "double-pulleyed" 455:narrow elongated postorbital (behind eyes) cranium 930:Gingerich, Philip D.; Russell, Donald E. (1981). 752: 1240:Uhen, Mark D (2010). "The Origin(s) of Whales". 659: 649: 635: 625: 530:found in the oldest obligate aquatic cetaceans, 368:Traits linking pakicetids to cetaceans include: 880:. Abhandlungen / Neue Folge, 91. Munich: Beck. 787: 785: 748: 746: 497:. However, in contrast to later cetaceans, the 452:incisors and canines aligned to the cheek teeth 1314: 1242:Annual Review of Earth and Planetary Sciences 1099:, an Eocene cetacean (Mammalia) from Pakistan 8: 733: 731: 729: 727: 1896: 1703: 1497: 1321: 1307: 1299: 416:a pachyosteosclerotic (thick, heavy bone) 125: 31: 1065: 1027: 568: 1148:10.1146/annurev.ecolsys.33.020602.095426 1136:Annual Review of Ecology and Systematics 445:basins and upper molars with very small 353: 723: 1094:; Madar, S.I.; Hussain, S.T. (1996). 572: 290:(early whales) that lived during the 7: 737: 690:Cooper, Thewissen & Hussain 2009 680:Cooper, Thewissen & Hussain 2009 669: 1262:10.1146/annurev-earth-040809-152453 612:Dehm & Oettingen-Spielberg 1958 602:Dehm & Oettingen-Spielberg 1958 307:Dehm & Oettingen-Spielberg 1958 282:("Pakistani whales") is an extinct 243:Thewissen, Madar & Hussain 1996 833:Journal of Vertebrate Paleontology 25: 1054:Evolution: Education and Outreach 1880: 1879: 145: 1080:Bulletin of the Carnegie Museum 571:disagreed and got support from 309:described the first pakicetid, 812:. Retrieved February 24, 2013. 580:probably ate freshwater prey. 1: 753:Thewissen & Williams 2002 660:Gingerich & Russell 1981 650:Gingerich & Russell 1981 636:Thewissen & Hussain 1998 626:Thewissen & Hussain 1998 2064:Prehistoric mammal families 2080: 552:Furthermore, according to 1875: 1337: 1127:; Williams, E.M. (2002). 1067:10.1007/s12052-009-0135-2 254: 249: 142:Scientific classification 140: 133: 124: 34: 2054:Eocene first appearances 470:external auditory meatus 1271:Journal of Paleontology 779:, Pakicetids, pp. 722–3 501:makes contact with the 472:and ear ossicles (i.e. 712:Evolution of cetaceans 520: 468:Pakicetid ears had an 2011:Paleobiology Database 1016:The Anatomical Record 827:Cooper, Lisa Noelle; 810:Paleobiology Database 792:Thewissen et al. 2001 765:Thewissen et al. 2009 608:Ichtyolestes pinfoldi 516: 357:Pakicetids have many 853:10.1671/039.029.0423 558:deltopectoral crests 1254:2010AREPS..38..189U 1194:2001Natur.413..277T 1171:Thewissen, J. G. M. 1076:Thewissen, J. G. M. 1046:Thewissen, J. G. M. 845:2009JVPal..29.1289C 829:Thewissen, J. G. M. 777:Nummela et al. 2007 632:Nalacetus ratimitus 528:aquatic adaptations 377:mandibular foramina 2059:Eocene extinctions 1097:Ambulocetus natans 740:, pp. 199–201 521: 486:mandibular foramen 387:cervical vertebrae 2036: 2035: 1998:Open Tree of Life 1902:Taxon identifiers 1893: 1892: 1871: 1870: 1693: 1692: 1445:Remingtonocetidae 1125:Thewissen, J.G.M. 1092:Thewissen, J.G.M. 1008:Thewissen, J.G.M. 934:Pakicetus inachus 686:Pakicetus chittas 666:Pakicetus attocki 656:Pakicetus inachus 518:Pakicetus attocki 461: 460: 328:Kala Chitta Hills 277: 276: 245: 27:Family of mammals 16:(Redirected from 2071: 2029: 2028: 2019: 2018: 2006: 2005: 1993: 1992: 1980: 1979: 1967: 1966: 1954: 1953: 1944: 1943: 1942: 1929: 1928: 1927: 1897: 1883: 1882: 1704: 1498: 1332:genera by family 1323: 1316: 1309: 1300: 1294: 1265: 1236: 1234: 1232: 1202:10.1038/35095005 1188:(6853): 277–81. 1179: 1166: 1164: 1162: 1133: 1120: 1087: 1071: 1069: 1041: 1031: 1029:10.1002/ar.20528 1006:Nummela, Sirpa; 1002: 965: 963: 961: 940: 926: 889: 872: 813: 801: 795: 794:, pp. 277–8 789: 780: 774: 768: 762: 756: 750: 741: 735: 676:Pakicetus calcis 354: 241: 236: 223: 150: 149: 129: 119: 49: 38:Temporal range: 32: 21: 2079: 2078: 2074: 2073: 2072: 2070: 2069: 2068: 2039: 2038: 2037: 2032: 2024: 2022: 2014: 2009: 2001: 1996: 1988: 1983: 1975: 1970: 1962: 1957: 1949: 1947: 1938: 1937: 1932: 1923: 1922: 1917: 1904: 1894: 1889: 1867: 1826: 1792: 1689: 1578: 1558: 1487: 1482:Remingtonocetus 1439: 1405: 1371: 1333: 1327: 1297: 1268: 1239: 1230: 1228: 1177: 1169: 1160: 1158: 1131: 1123: 1109: 1090: 1074: 1044: 1005: 968: 959: 957: 938: 929: 892: 875: 826: 822: 817: 816: 802: 798: 790: 783: 775: 771: 763: 759: 755:, pp. 75–8 751: 744: 736: 725: 720: 703: 586: 511: 466: 426:sigmoid process 304: 267: 261: 240: 234: 221: 144: 120: 118: 117: 116: 115: 110: 105: 100: 95: 90: 85: 80: 75: 70: 65: 60: 55: 44: 43: 36: 28: 23: 22: 15: 12: 11: 5: 2077: 2075: 2067: 2066: 2061: 2056: 2051: 2041: 2040: 2034: 2033: 2031: 2030: 2020: 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977:(1): 176–200. 966: 927: 890: 873: 839:(4): 1289–99. 823: 821: 818: 815: 814: 796: 781: 769: 757: 742: 722: 721: 719: 716: 715: 714: 709: 702: 699: 698: 697: 696: 695: 694: 693: 683: 673: 663: 641: 640: 639: 617: 616: 615: 585: 582: 569:Gingerich 2003 510: 507: 491:tympanic bulla 465: 462: 459: 458: 457: 456: 453: 450: 431: 428: 418:auditory bulla 412: 411: 410: 403: 396: 389: 383: 370: 369: 366: 303: 300: 275: 274: 252: 251: 247: 246: 232: 228: 227: 219: 216:Informal group 212: 211: 206: 202: 201: 196: 192: 191: 186: 182: 181: 176: 172: 171: 166: 162: 161: 156: 152: 151: 138: 137: 131: 130: 122: 121: 113: 112: 111: 106: 101: 96: 91: 86: 81: 76: 71: 66: 61: 56: 51: 50: 37: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2076: 2065: 2062: 2060: 2057: 2055: 2052: 2050: 2047: 2046: 2044: 2027: 2021: 2017: 2012: 2008: 2004: 1999: 1995: 1991: 1986: 1982: 1978: 1973: 1969: 1965: 1960: 1956: 1952: 1946: 1941: 1935: 1931: 1926: 1920: 1916: 1915: 1913: 1911: 1907: 1903: 1898: 1886: 1878: 1877: 1874: 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1469: 1465: 1463: 1462: 1458: 1456: 1455: 1454:Andrewsiphius 1451: 1450: 1448: 1446: 1442: 1436: 1435: 1434:Himalayacetus 1431: 1429: 1428: 1424: 1422: 1421: 1417: 1416: 1414: 1412: 1411:Ambulocetidae 1408: 1402: 1401: 1400:Ichthyolestes 1397: 1395: 1394: 1390: 1388: 1387: 1383: 1382: 1380: 1378: 1374: 1368: 1364: 1362: 1358: 1356: 1352: 1350: 1346: 1344: 1340: 1339: 1336: 1331: 1324: 1319: 1317: 1312: 1310: 1305: 1304: 1301: 1292: 1288: 1284: 1280: 1276: 1272: 1267: 1263: 1259: 1255: 1251: 1247: 1243: 1238: 1227: 1223: 1219: 1215: 1211: 1207: 1203: 1199: 1195: 1191: 1187: 1183: 1176: 1172: 1168: 1157: 1153: 1149: 1145: 1141: 1137: 1130: 1126: 1122: 1118: 1114: 1110: 1108:9783929907322 1104: 1100: 1096: 1093: 1089: 1085: 1081: 1077: 1073: 1068: 1063: 1059: 1055: 1051: 1047: 1043: 1039: 1035: 1030: 1025: 1022:(6): 716–33. 1021: 1017: 1013: 1009: 1004: 1000: 996: 992: 988: 984: 980: 976: 972: 967: 956: 952: 948: 944: 937: 935: 928: 924: 920: 916: 912: 908: 904: 901:(3): 429–54. 900: 896: 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Index

Pakicetids
Early Eocene
Ma
PreꞒ

O
S
D
C
P
T
J
K
Pg
N

Scientific classification
Edit this classification
Eukaryota
Animalia
Chordata
Mammalia
Artiodactyla
Cetacea
Archaeoceti
Pakicetidae
Thewissen, Madar & Hussain 1996
Pakicetus
Nalacetus
Ichthyolestes

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