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Mesenosaurus

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491: 3684: 1468: 111: 3382: 131: 392: 3394: 3717: 3388: 2861: 2866: 514:, due to its lack of cranial similarities to others. It was also the first synapsid described from the Russian area to be considered a “good pelycosaur”, as it possessed upper jaw teeth that were consistent with other known pelycosaurs (slender, recurved, enlarged incisors, single caniniform tooth). Romer and Price hypothesized that 1420:). This evolutionary stasis may be attributed to a conserved niche occupation throughout their temporal and geographical ranges. Further research on postcranial features is required in order to determine if this hypothesis is correct, as we would need to observe a similar degree of stasis throughout the entire skeleton. 490: 435:
First premaxillary tooth smaller than the second and third teeth. (There is a maximum of five teeth on the premaxilla. The first tooth is smaller than the second and third, but larger than the last two. These five teeth are closely spaced, strongly recurved, sharply pointed, and have a sharp, cutting
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They possessed unbent and flattened unguals, suggesting they were diggers. It is uncertain whether their digging unguals were adapted for burrowing or solely digging for food. Many varanopids were arboreal, however the well-developed olecranon(bony prominence of the elbow) of Mesenosaurus indicates
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There is a 20 Myr gap between these two species, which exceeds the temporal range of most extinct tetrapods. Though this gap is questionable, the radioisotopic dating of speleothems, recovered for Richards Spur, used to identify this 20 Myr gap is a reliable technique that has been used to identify
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The Mezen River basin is located in northern Russia and has extensive exposures of Middle Permian sediments along the edges of affluent rivers of the Mezen River. These sediments have produced many skeletal remains of diverse amniotes, but most importantly, a partial skull of “a small synapsid of
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Spindler, Frederik; Werneburg, Ralf; Schneider, Joerg W.; Luthardt, Ludwig; Annacker, Volker; Rößler, Ronny (2018-03-15). "First arboreal 'pelycosaurs' (Synapsida: Varanopidae) from the early Permian Chemnitz Fossil Lagerstätte, SE Germany, with a review of varanopid phylogeny".
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the presence of triceps and anconeus muscle, both of which would provide powerful forearm extension. This forearm extension strength combined with its somewhat small/medium body size supports the idea of a burrowing lifestyle. It is also proposed that
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was a small mobile creature, capable of climbing rocks/trees. Their small size allowed them to occupy and thrive in niches as small faunivores while therapsids dominated most terrestrial environments. It was not until the late Permian when small
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MacDougall, Mark J.; Tabor, Neil J.; Woodhead, Jon; Daoust, Andrew R.; Reisz, Robert R. (June 2017). "The unique preservational environment of the Early Permian (Cisuralian) fossiliferous cave deposits of the Richards Spur locality, Oklahoma".
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Woodhead, Jon; Reisz, Robert; Fox, David; Drysdale, Russell; Hellstrom, John; Maas, Roland; Cheng, Hai; Edwards, R. Lawrence (May 2010). "Speleothem climate records from deep time? Exploring the potential with an example from the Permian".
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from Russia. Some of these shared features include relative size and shape of the temporal fenestra, lateral swelling of the maxilla in the caniniform region and five premaxillary tooth positions (not reported in other mycterosaurines).
561:. Its nearly complete skull and mandible was discovered at Richards Spur locality within a series of infilled karst fissures in the Ordovician Arbuckle limestone in Oklahoma, which is one of the most plentiful sites for early 1416:
other large gaps/long temporal ranges. This gap is significant, as it indicates evolutionary stasis (persisting throughout different environments across Pangea as well as faunal turnovers throughout the Permian-specifically
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share many distinct features, there are four main morphological differences between these specimens that deem a taxonomic distinction at the species level (differences insufficient for distinction above species level):
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Spindler, Frederik; Werneburg, Ralf; Schneider, Jörg W. (2019-01-19). "A new mesenosaurine from the lower Permian of Germany and the postcrania of Mesenosaurus: implications for early amniote comparative osteology".
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are small sized varanopid synapsids. They are characterized by mainly cranial features. Many of the postcranial features of this genus have not been analyzed fully due to a lack of fossil evidence.
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A very prominent, nodular ornamentation is present on the orbital margins of the prefrontal, postorbital, and jugal. (This characteristic is strikingly pronounced in well-preserved skulls of
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Anderson, Jason S.; Reisz, Robert R. (2004-03-25). "Pyozia mesenensis, a new, small varanopid (Synapsida, Eupelycosauria) from Russia: "pelycosaur" diversity in the Middle Permian".
1456:. This is based on the presence of a rearward shift of center of body mass (slender trunks, elongated hindlimbs, and short forelimbs) that is necessary for facultative bipedalism. 2097: 1852:
Modesto, Christian A. Sidor, Bruce, Sean (2001-12-01). "A second varanopseid skull from the Upper Permian of South Africa: implications for Late Permian 'pelycosaur' evolution".
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represents a guild of highly agile subordinate predators in their communities due to their large, slender, curved teeth, which could cause severe wounds when piercing its prey.
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The presence of short dorsal premaxillary processes (that do not extend to either the posterior narial margin or the posterior separation of the premaxillae by the nasals)
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Marginal dentition is composed of strongly recurved, laterally compressed, sharply pointed teeth front and back cutting edges restricted to the distal half of the tooth
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Well-developed depression on the lateral surface of the nasal that extends posteriorly from the narial border to nearly the anterior end of the prefrontal
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Parasphenoid plate is broad and basisphenoidal tubera are wing like and extend far laterally and posteriorly from the base of cultriform process
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Benson, R.J. (2012). "Interrelationships of basal synapsids: cranial and postcranial morphological partitions suggest different topologies".
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Dorsoventral expanded temporal fenestra occupies most of the height of temporal region, resulting in narrow subtemporal bar
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Tabular shrinks in size that become small, narrow elements that contacts medial margin of posterolateral wing of parietal
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romeri, a small varanopseid (Synapsida: Eupelycosauria) from the Upper Permian of the Mezen River Basin, northern Russia
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Absence of medial, occipital flange of posterior margin of squamosal that covers posterior margin of quadrate
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Well-developed premaxillary subnarial shelf whose external surface is broadly rounded in transverse section
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belonged to Varanopseidae. This hypothesis was confirmed in 2001 based on the following synapomorphies:
1521:"A new varanopid synapsid from the early Permian of Oklahoma and the evolutionary stasis in this clade" 1417: 3769: 3550: 3518: 1810: 1713: 1634: 1112: 362:
as a genus. The genus name means “lizard from Mezen” while the specific epithet is given in honor of
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Prominent, nodular ornamentation is present on orbital margins of prefrontal, postorbital, and jugal
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Postorbital cheek region of skull unusually broad and low, with nearly vertical posterior margin
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Dorsal process of premaxilla is long and forms anterior half of dorsal margin of external naris
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Anterior median process of parietal extends into the supraorbital region of skull table
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slender, short, and rod-like, with modestly developed footplate and distally expanded
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Short posterior process of the maxilla fails to reach the level of the postorbital bar
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Savage, Jay M.; Romer, Alfred Sherwood (1957-07-15). "Osteology of the Reptiles".
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Small postfrontal medially borders narrow, posterior process of the frontal
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Slight lateral swelling of the maxilla at the level of the caniniform tooth
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was discovered in 1938 by Ivan Efremov and became the first species of
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ROMER, A. S.; PRICE, L. W. (1940), "Review of the Pelycosauria",
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more closely resembles those in early therapsids of the Permian.)
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forms a narrow, rectangular snout (from dorsal and ventral views)
1991:"A revision of the extensor muscles in the forearm in tetrapods" 3735: 3409: 2881: 2283: 2146: 2108: 342:’s stratigraphic range is the middle to late Guadalupian while 637:
modified from the analysis of Benson, after the exclusion of
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Palatal process of premaxilla is long with long median suture
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appeared and provided competition, leading to a decline in
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is angled slightly anterolaterally from basal articulation.
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was named in honor of Ivan Efremov, who erected the genus.
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Expanded narial shelf that extends almost to the snout tip
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and all varanopseids related more closely to it than to
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Contact between the postorbital and supratemporal bones
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Reisz (2019). 2120: 8: 1886:: CS1 maint: multiple names: authors list ( 445:Posterior edge of transverse flange of the 3732: 3567: 3430: 3419: 3406: 3212: 3115: 2986: 2982: 2895: 2891: 2878: 2768: 2553: 2540: 2340: 2308: 2304: 2293: 2280: 2222: 2195: 2186: 2143: 2127: 2113: 2105: 346:’s stratigraphic range is the Cisuralian. 109: 20: 2002: 1965: 1733: 1544: 2090:"Main Groups of Non-Mammalian Synapsida" 390: 1498: 402:The cranial features that characterize 295:. This genus includes two species: the 2100:from the original on December 3, 2023. 1879: 1903: 1901: 1899: 1897: 7: 1604:28 : Review of the Pelycosauria 1570: 1568: 1566: 1564: 1514: 1512: 1510: 1508: 1506: 1504: 1502: 611:Fewer tooth positions on the maxilla 557:The second species of this genus is 1670:Journal of Systematic Palaeontology 1280: 1256: 1197: 1173: 1166: 1085: 1061: 1051: 1027: 1003: 931: 907: 883: 873: 809: 785: 763: 756: 702: 695: 651: 644: 1803:Journal of Vertebrate Paleontology 608:More posteriorly extensive maxilla 14: 2074:"Mesenosaurus (cast of skeleton)" 439:Single, median vomerine tooth row 3716: 3715: 3682: 3392: 3386: 3380: 2864: 2859: 1466: 129: 354:Famous Russian paleontologist, 302:from the middle Permian (upper 1: 3885:Fossil taxa described in 1938 3880:Fossils of the United States 1682:10.1080/14772019.2011.631042 1647:10.1016/j.palaeo.2017.02.019 1012:Archaeovenator hamiltonensis 3890:Taxa named by Ivan Yefremov 3855:Prehistoric synapsid genera 291:. It belongs to the family 3906: 1960:. 84(Pt 1) (Pt 1): 13–29. 1866:10.1080/002411601753292971 1525:Royal Society Open Science 958:Stereophallodon ciscoensis 584:shares more features with 16:Extinct genus of synapsids 3695: 3680: 3433: 3418: 3405: 3378: 3215: 3118: 2989: 2985: 2894: 2890: 2877: 2857: 2767: 2556: 2311: 2307: 2292: 2279: 2225: 2198: 2185: 2142: 2094:Mikko's Phylogeny Archive 1997:. 73(2) (Pt 1): 211–233. 1923:10.1007/s12542-018-0439-z 1772:10.1007/s12542-018-0405-9 1575:Reisz, Robert R. (2001). 1531:(10): Article ID 191297. 1302: 1285: 1278: 1261: 1254: 1219: 1202: 1195: 1178: 1171: 1164: 1126: 1109: 1090: 1083: 1066: 1059: 1049: 1032: 1025: 1008: 1001: 954: 936: 929: 916:Varanosaurus acutirostris 912: 905: 888: 881: 871: 829: 814: 807: 790: 783: 768: 761: 754: 725: 707: 700: 693: 673: 656: 649: 502:varanopseid affinities”, 254: 249: 233: 226: 126:Scientific classification 124: 117: 108: 23: 568:In terms of classifying 459:process. (The stapes of 269:Maho, Gee et Reisz, 2019 1265:Ruthiromia elcobriensis 1095:Elliotsmithia longiceps 1070:Mycterosaurus longiceps 892:Archaeothyris florensis 574:Mycterosaurus longiceps 1450:facultative bipedalism 1306:Aerosaurus greenleorum 498: 399: 3875:Permian United States 3822:Paleobiology Database 1989:Haines, R.W. (1939). 1952:Haines, R.W. (1950). 1182:Varanops brevirostris 729:Protorothyris archeri 559:Mesenosaurus efremovi 552:Mesenosaurus efremovi 493: 394: 370:Mesenosaurus efremovi 316:Mesenosaurus efremovi 1113:Heleosaurus scholtzi 1815:2004JVPal..24..173A 1718:2010Geo....38..455W 1639:2017PPP...475....1M 1537:10.1098/rsos.191297 1482:List of pelycosaurs 1474:Paleontology portal 1130:Mesenosaurus romeri 794:Ianthodon schultzei 677:Limnoscelis paludis 504:Mesenosaurus romeri 495:Mesenosaurus romeri 485:Mesenosaurus romeri 396:Mesenosaurus romeri 300:Mesenosaurus romeri 239:Mesenosaurus romeri 119:Mesenosaurus romeri 1995:Journal of Anatomy 1958:Journal of Anatomy 1487:List of varanopids 1289:Aerosaurus wellesi 565:tetrapod fossils. 499: 400: 398:skull illustration 310:Basin of northern 3870:Fossils of Russia 3860:Permian synapsids 3837: 3836: 3809:Open Tree of Life 3738:Taxon identifiers 3729: 3728: 3691: 3690: 3678: 3677: 3674: 3673: 3625: 3624: 3401: 3400: 3376: 3375: 3372: 3371: 3368: 3367: 3364: 3363: 3208:Sphenacodontoidea 3181:Palaeohatteriidae 3103: 3102: 2970: 2969: 2873: 2872: 2855: 2854: 2851: 2850: 2847: 2846: 2763: 2762: 2739: 2738: 2528: 2527: 2524: 2523: 2275: 2274: 2271: 2270: 2267: 2266: 2263: 2262: 2084:on March 4, 2016. 1407: 1406: 1398: 1397: 1389: 1388: 1380: 1379: 1371: 1370: 1362: 1361: 1353: 1352: 1344: 1343: 1335: 1334: 1326: 1325: 1317: 1316: 1243: 1242: 1234: 1233: 1150: 1149: 1141: 1140: 1036:Pyozia mesenensis 987: 986: 978: 977: 969: 968: 860: 859: 851: 850: 842: 841: 740: 739: 276: 275: 270: 262: 222: 3897: 3830: 3829: 3817: 3816: 3804: 3803: 3791: 3790: 3778: 3777: 3765: 3764: 3763: 3733: 3719: 3718: 3686: 3662: 3652: 3642: 3573: 3568: 3538: 3506: 3480: 3454: 3439: 3431: 3420: 3407: 3396: 3390: 3384: 3238:Sphenacodontidae 3236: 3221: 3213: 3179: 3164: 3154: 3144: 3134: 3124: 3116: 3020: 3005: 2995: 2987: 2983: 2977:Haptodontiformes 2901: 2896: 2892: 2879: 2868: 2863: 2837:Protoclepsydrops 2834: 2824: 2814: 2804: 2794: 2784: 2769: 2554: 2546: 2541: 2480:Lalieudorhynchus 2341: 2333: 2317: 2309: 2305: 2294: 2281: 2223: 2196: 2187: 2180: 2179: 2144: 2129: 2122: 2115: 2106: 2101: 2085: 2080:. Archived from 2078:Fossils.valdosta 2060: 2059: 2023: 2017: 2016: 2006: 1986: 1980: 1979: 1969: 1949: 1943: 1942: 1905: 1892: 1891: 1885: 1877: 1849: 1843: 1842: 1798: 1792: 1791: 1754: 1748: 1747: 1737: 1726:10.1130/g30354.1 1700: 1694: 1693: 1665: 1659: 1658: 1621: 1615: 1614: 1612:10.1130/spe28-p1 1599: 1593: 1592: 1572: 1559: 1558: 1548: 1516: 1476: 1471: 1470: 1469: 1411:Paleoenvironment 1281: 1257: 1223:Varanodon agilis 1198: 1174: 1167: 1086: 1062: 1052: 1028: 1004: 932: 908: 884: 874: 810: 786: 764: 757: 703: 696: 652: 645: 578:Varanodon agilis 268: 260: 236: 220: 213: 200: 187: 134: 133: 113: 103: 40: 29:Temporal range: 21: 3905: 3904: 3900: 3899: 3898: 3896: 3895: 3894: 3840: 3839: 3838: 3833: 3825: 3820: 3812: 3807: 3799: 3794: 3786: 3781: 3773: 3768: 3759: 3758: 3753: 3740: 3730: 3725: 3687: 3670: 3621: 3592: 3557: 3531: 3499: 3473: 3447: 3427: 3414: 3397: 3360: 3340: 3304:Secodontosaurus 3229: 3202: 3172: 3147:Hypselohaptodus 3112: 3099: 3087:Remigiomontanus 3013: 2979: 2966: 2947:Stereophallodon 2903:Ophiacodontidae 2886: 2869: 2843: 2759: 2735: 2672: 2617: 2537: 2520: 2381: 2326: 2301: 2288: 2259: 2239: 2212: 2206:Tetrapodomorpha 2191:Tetrapodomorpha 2181: 2149: 2148: 2138: 2133: 2088: 2072: 2069: 2064: 2063: 2040:10.2307/1439431 2025: 2024: 2020: 1988: 1987: 1983: 1951: 1950: 1946: 1907: 1906: 1895: 1878: 1851: 1850: 1846: 1823:10.1671/1940-13 1800: 1799: 1795: 1756: 1755: 1751: 1702: 1701: 1697: 1667: 1666: 1662: 1623: 1622: 1618: 1601: 1600: 1596: 1574: 1573: 1562: 1518: 1517: 1500: 1495: 1472: 1467: 1465: 1462: 1426: 1413: 1408: 1399: 1390: 1381: 1372: 1363: 1354: 1345: 1336: 1327: 1318: 1244: 1235: 1206:Watongia meieri 1151: 1142: 1056:Mycterosaurinae 988: 979: 970: 878:Ophiacodontidae 861: 852: 843: 741: 631: 555: 488: 481: 389: 378: 352: 318:from the early 245: 242: 219: 211: 202:Mycterosaurinae 198: 185: 128: 104: 102: 101: 96: 91: 86: 81: 76: 71: 66: 61: 56: 51: 46: 35: 34: 27: 17: 12: 11: 5: 3903: 3901: 3893: 3892: 3887: 3882: 3877: 3872: 3867: 3865:Permian Russia 3862: 3857: 3852: 3842: 3841: 3835: 3834: 3832: 3831: 3818: 3805: 3792: 3779: 3766: 3750: 3748: 3742: 3741: 3736: 3727: 3726: 3724: 3723: 3713: 3708: 3703: 3696: 3693: 3692: 3689: 3688: 3681: 3679: 3676: 3675: 3672: 3671: 3669: 3668: 3658: 3648: 3637: 3635: 3632:Incertae sedis 3627: 3626: 3623: 3622: 3620: 3619: 3618: 3617: 3611: 3602: 3600: 3594: 3593: 3591: 3590: 3589: 3588: 3579: 3577: 3565: 3563:Eutheriodontia 3559: 3558: 3556: 3555: 3554: 3553: 3544: 3542: 3533: 3532: 3530: 3529: 3528: 3527: 3521: 3512: 3510: 3501: 3500: 3498: 3497: 3496: 3495: 3486: 3484: 3475: 3474: 3472: 3471: 3470: 3469: 3460: 3458: 3449: 3448: 3446: 3445: 3434: 3428: 3423: 3416: 3415: 3410: 3403: 3402: 3399: 3398: 3379: 3377: 3374: 3373: 3370: 3369: 3366: 3365: 3362: 3361: 3359: 3358: 3357: 3356: 3350: 3348: 3342: 3341: 3339: 3338: 3330: 3322: 3314: 3307: 3300: 3293: 3286: 3279: 3272: 3264: 3261:Ctenospondylus 3257: 3250: 3242: 3240: 3231: 3230: 3228: 3227: 3216: 3210: 3204: 3203: 3201: 3200: 3193: 3190:Palaeohatteria 3185: 3183: 3174: 3173: 3171: 3170: 3160: 3150: 3140: 3130: 3119: 3113: 3110:Sphenacodontia 3108: 3105: 3104: 3101: 3100: 3098: 3097: 3090: 3083: 3076: 3073:Melanedaphodon 3069: 3062: 3055: 3048: 3041: 3034: 3031:Bohemiclavulus 3026: 3024: 3022:Edaphosauridae 3015: 3014: 3012: 3011: 3001: 2990: 2980: 2975: 2972: 2971: 2968: 2967: 2965: 2964: 2957: 2950: 2943: 2936: 2929: 2922: 2915: 2907: 2905: 2888: 2887: 2882: 2875: 2874: 2871: 2870: 2858: 2856: 2853: 2852: 2849: 2848: 2845: 2844: 2842: 2841: 2830: 2820: 2810: 2800: 2790: 2779: 2777: 2774:Incertae sedis 2765: 2764: 2761: 2760: 2758: 2757: 2756: 2755: 2749: 2747: 2741: 2740: 2737: 2736: 2734: 2733: 2726: 2719: 2712: 2705: 2698: 2690: 2682: 2680: 2678:Varanodontinae 2674: 2673: 2671: 2670: 2663: 2656: 2649: 2642: 2635: 2627: 2625: 2623:Mesenosaurinae 2619: 2618: 2616: 2615: 2612:Thrausmosaurus 2608: 2601: 2593: 2586: 2579: 2572: 2569:Archaeovenator 2565: 2557: 2551: 2538: 2535:Eupelycosauria 2533: 2530: 2529: 2526: 2525: 2522: 2521: 2519: 2518: 2511: 2504: 2497: 2490: 2483: 2476: 2469: 2462: 2455: 2448: 2445:Cotylorhynchus 2441: 2434: 2427: 2420: 2413: 2406: 2399: 2391: 2389: 2383: 2382: 2380: 2379: 2372: 2365: 2358: 2349: 2347: 2338: 2328: 2327: 2325: 2324: 2320:Diadectomorpha 2312: 2302: 2297: 2290: 2289: 2284: 2277: 2276: 2273: 2272: 2269: 2268: 2265: 2264: 2261: 2260: 2258: 2257: 2256: 2255: 2249: 2247: 2241: 2240: 2238: 2237: 2236: 2235: 2233:Reptiliomorpha 2226: 2220: 2218:Reptiliomorpha 2214: 2213: 2211: 2210: 2209: 2208: 2199: 2193: 2183: 2182: 2178: 2177: 2168: 2162: 2156: 2147: 2140: 2139: 2134: 2132: 2131: 2124: 2117: 2109: 2103: 2102: 2086: 2068: 2067:External links 2065: 2062: 2061: 2018: 1981: 1944: 1917:(2): 303–344. 1893: 1860:(4): 249–259. 1844: 1809:(1): 173–179. 1793: 1766:(2): 315–364. 1749: 1735:1959.13/931960 1712:(5): 455–458. 1695: 1676:(4): 601–624. 1660: 1616: 1594: 1560: 1497: 1496: 1494: 1491: 1490: 1489: 1484: 1478: 1477: 1461: 1458: 1425: 1422: 1412: 1409: 1405: 1404: 1401: 1400: 1396: 1395: 1392: 1391: 1387: 1386: 1383: 1382: 1378: 1377: 1374: 1373: 1369: 1368: 1365: 1364: 1360: 1359: 1356: 1355: 1351: 1350: 1347: 1346: 1342: 1341: 1338: 1337: 1333: 1332: 1329: 1328: 1324: 1323: 1320: 1319: 1315: 1314: 1311: 1310: 1301: 1298: 1297: 1294: 1293: 1284: 1279: 1277: 1274: 1273: 1270: 1269: 1260: 1255: 1253: 1250: 1249: 1246: 1245: 1241: 1240: 1237: 1236: 1232: 1231: 1228: 1227: 1218: 1215: 1214: 1211: 1210: 1201: 1196: 1194: 1191: 1190: 1187: 1186: 1177: 1172: 1170: 1165: 1163: 1157: 1156: 1153: 1152: 1148: 1147: 1144: 1143: 1139: 1138: 1135: 1134: 1125: 1122: 1121: 1118: 1117: 1108: 1105: 1104: 1101: 1100: 1089: 1084: 1082: 1079: 1078: 1075: 1074: 1065: 1060: 1058: 1050: 1048: 1045: 1044: 1041: 1040: 1031: 1026: 1024: 1021: 1020: 1017: 1016: 1007: 1002: 1000: 994: 993: 990: 989: 985: 984: 981: 980: 976: 975: 972: 971: 967: 966: 963: 962: 953: 950: 949: 946: 945: 935: 930: 928: 925: 924: 921: 920: 911: 906: 904: 901: 900: 897: 896: 887: 882: 880: 872: 870: 867: 866: 863: 862: 858: 857: 854: 853: 849: 848: 845: 844: 840: 839: 836: 835: 832:Sphenacodontia 828: 825: 824: 821: 820: 817:Edaphosauridae 813: 808: 806: 803: 802: 799: 798: 789: 784: 782: 779: 778: 775: 774: 767: 762: 760: 755: 753: 747: 746: 743: 742: 738: 737: 734: 733: 724: 721: 720: 717: 716: 706: 701: 699: 694: 692: 686: 685: 682: 681: 672: 669: 668: 665: 664: 660:Tseajaia campi 655: 650: 648: 643: 630: 627: 616: 615: 612: 609: 606: 554: 549: 548: 547: 544: 541: 538: 535: 532: 529: 526: 523: 487: 482: 480: 477: 476: 475: 464: 450: 443: 440: 437: 433: 430: 427: 424: 421: 418: 415: 388: 385: 377: 374: 358:, established 351: 348: 283:is an extinct 274: 273: 272: 271: 263: 252: 251: 247: 246: 243: 231: 230: 224: 223: 209: 205: 204: 196: 192: 191: 183: 179: 178: 173: 166: 165: 160: 156: 155: 150: 146: 145: 140: 136: 135: 122: 121: 115: 114: 106: 105: 97: 92: 87: 82: 77: 72: 67: 62: 57: 52: 47: 42: 41: 28: 15: 13: 10: 9: 6: 4: 3: 2: 3902: 3891: 3888: 3886: 3883: 3881: 3878: 3876: 3873: 3871: 3868: 3866: 3863: 3861: 3858: 3856: 3853: 3851: 3848: 3847: 3845: 3828: 3823: 3819: 3815: 3810: 3806: 3802: 3797: 3793: 3789: 3784: 3780: 3776: 3771: 3767: 3762: 3756: 3752: 3751: 3749: 3747: 3743: 3739: 3734: 3722: 3714: 3712: 3709: 3707: 3706:Phthinosuchia 3704: 3702: 3698: 3697: 3694: 3685: 3667: 3666: 3659: 3657: 3656: 3649: 3647: 3646: 3639: 3638: 3636: 3634: 3633: 3628: 3616: 3612: 3610: 3606: 3605: 3604: 3603: 3601: 3599: 3595: 3587: 3586:Therocephalia 3583: 3582: 3581: 3580: 3578: 3576: 3575:Therocephalia 3569: 3566: 3564: 3560: 3552: 3548: 3547: 3546: 3545: 3543: 3541: 3534: 3526: 3522: 3520: 3516: 3515: 3514: 3513: 3511: 3509: 3502: 3494: 3490: 3489: 3488: 3487: 3485: 3483: 3476: 3468: 3464: 3463: 3462: 3461: 3459: 3457: 3450: 3444: 3443: 3436: 3435: 3432: 3429: 3426: 3421: 3417: 3413: 3408: 3404: 3395: 3391: 3389: 3383: 3354: 3353: 3352: 3351: 3349: 3347: 3343: 3336: 3335: 3334:Tetraceratops 3331: 3328: 3327: 3326:Tappenosaurus 3323: 3320: 3319: 3315: 3313: 3312: 3308: 3306: 3305: 3301: 3299: 3298: 3294: 3292: 3291: 3287: 3285: 3284: 3280: 3278: 3277: 3273: 3270: 3269: 3265: 3263: 3262: 3258: 3256: 3255: 3251: 3249: 3248: 3247:Cryptovenator 3244: 3243: 3241: 3239: 3232: 3226: 3225: 3218: 3217: 3214: 3211: 3209: 3205: 3199: 3198: 3197:Pantelosaurus 3194: 3192: 3191: 3187: 3186: 3184: 3182: 3175: 3169: 3168: 3167:Tetraceratops 3161: 3159: 3158: 3157:Kenomagnathus 3151: 3149: 3148: 3141: 3139: 3138: 3131: 3129: 3128: 3121: 3120: 3117: 3114: 3111: 3106: 3096: 3095: 3094:Xyrospondylus 3091: 3089: 3088: 3084: 3082: 3081: 3077: 3075: 3074: 3070: 3068: 3067: 3063: 3061: 3060: 3056: 3054: 3053: 3049: 3047: 3046: 3042: 3040: 3039: 3035: 3033: 3032: 3028: 3027: 3025: 3023: 3016: 3010: 3009: 3002: 3000: 2999: 2992: 2991: 2988: 2984: 2981: 2978: 2973: 2963: 2962: 2958: 2956: 2955: 2954:Stereorhachis 2951: 2949: 2948: 2944: 2942: 2941: 2937: 2935: 2934: 2930: 2928: 2927: 2923: 2921: 2920: 2916: 2914: 2913: 2912:Archaeothyris 2909: 2908: 2906: 2904: 2897: 2893: 2889: 2885: 2880: 2876: 2867: 2862: 2839: 2838: 2831: 2829: 2828: 2821: 2819: 2818: 2811: 2809: 2808: 2801: 2799: 2798: 2791: 2789: 2788: 2781: 2780: 2778: 2776: 2775: 2770: 2766: 2753: 2752: 2751: 2750: 2748: 2746: 2742: 2732: 2731: 2727: 2725: 2724: 2720: 2718: 2717: 2713: 2711: 2710: 2709:Tambacarnifex 2706: 2704: 2703: 2699: 2696: 2695: 2694:Mycterosaurus 2691: 2689: 2688: 2684: 2683: 2681: 2679: 2675: 2669: 2668: 2667:Microvaranops 2664: 2662: 2661: 2657: 2655: 2654: 2650: 2648: 2647: 2646:Elliotsmithia 2643: 2641: 2640: 2636: 2634: 2633: 2629: 2628: 2626: 2624: 2620: 2614: 2613: 2609: 2607: 2606: 2602: 2599: 2598: 2594: 2592: 2591: 2587: 2585: 2584: 2580: 2578: 2577: 2573: 2571: 2570: 2566: 2564: 2563: 2559: 2558: 2555: 2552: 2549: 2542: 2539: 2536: 2531: 2517: 2516: 2512: 2510: 2509: 2508:Ruthenosaurus 2505: 2503: 2502: 2501:Phreatophasma 2498: 2496: 2495: 2491: 2489: 2488: 2484: 2482: 2481: 2477: 2475: 2474: 2470: 2468: 2467: 2463: 2461: 2460: 2456: 2454: 2453: 2449: 2447: 2446: 2442: 2440: 2439: 2435: 2433: 2432: 2428: 2426: 2425: 2421: 2419: 2418: 2417:Callibrachion 2414: 2412: 2411: 2407: 2405: 2404: 2400: 2398: 2397: 2393: 2392: 2390: 2388: 2384: 2378: 2377: 2373: 2371: 2370: 2366: 2364: 2363: 2359: 2356: 2355: 2351: 2350: 2348: 2346: 2342: 2339: 2336: 2329: 2322: 2321: 2314: 2313: 2310: 2306: 2303: 2300: 2295: 2291: 2287: 2282: 2278: 2253: 2252: 2251: 2250: 2248: 2246: 2242: 2234: 2230: 2229: 2228: 2227: 2224: 2221: 2219: 2215: 2207: 2203: 2202: 2201: 2200: 2197: 2194: 2192: 2188: 2184: 2176: 2172: 2169: 2167: 2163: 2161: 2157: 2155: 2151: 2150: 2145: 2141: 2137: 2130: 2125: 2123: 2118: 2116: 2111: 2110: 2107: 2099: 2095: 2091: 2087: 2083: 2079: 2075: 2071: 2070: 2066: 2057: 2053: 2049: 2045: 2041: 2037: 2033: 2029: 2022: 2019: 2014: 2010: 2005: 2000: 1996: 1992: 1985: 1982: 1977: 1973: 1968: 1963: 1959: 1955: 1948: 1945: 1940: 1936: 1932: 1928: 1924: 1920: 1916: 1912: 1904: 1902: 1900: 1898: 1894: 1889: 1883: 1875: 1871: 1867: 1863: 1859: 1855: 1848: 1845: 1840: 1836: 1832: 1828: 1824: 1820: 1816: 1812: 1808: 1804: 1797: 1794: 1789: 1785: 1781: 1777: 1773: 1769: 1765: 1761: 1753: 1750: 1745: 1741: 1736: 1731: 1727: 1723: 1719: 1715: 1711: 1707: 1699: 1696: 1691: 1687: 1683: 1679: 1675: 1671: 1664: 1661: 1656: 1652: 1648: 1644: 1640: 1636: 1632: 1628: 1620: 1617: 1613: 1609: 1605: 1598: 1595: 1590: 1586: 1582: 1578: 1577:The skull of 1571: 1569: 1567: 1565: 1561: 1556: 1552: 1547: 1542: 1538: 1534: 1530: 1526: 1522: 1515: 1513: 1511: 1509: 1507: 1505: 1503: 1499: 1492: 1488: 1485: 1483: 1480: 1479: 1475: 1464: 1459: 1457: 1455: 1451: 1445: 1443: 1439: 1435: 1430: 1423: 1421: 1419: 1410: 1403: 1402: 1394: 1393: 1385: 1384: 1376: 1375: 1367: 1366: 1358: 1357: 1349: 1348: 1340: 1339: 1331: 1330: 1322: 1321: 1313: 1312: 1309: 1308: 1307: 1300: 1299: 1296: 1295: 1292: 1291: 1290: 1283: 1282: 1276: 1275: 1272: 1271: 1268: 1267: 1266: 1259: 1258: 1252: 1251: 1248: 1247: 1239: 1238: 1230: 1229: 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697: 691: 688: 687: 684: 683: 680: 679: 678: 671: 670: 667: 666: 663: 662: 661: 654: 653: 647: 646: 642: 640: 636: 628: 626: 624: 620: 613: 610: 607: 604: 603: 602: 599: 595: 590: 587: 583: 579: 575: 571: 566: 564: 560: 553: 550: 545: 542: 539: 536: 533: 530: 527: 524: 521: 520: 519: 517: 513: 509: 505: 496: 492: 486: 483: 478: 473: 469: 465: 462: 458: 454: 451: 448: 444: 441: 438: 434: 431: 428: 425: 422: 419: 416: 413: 409: 408: 407: 405: 397: 393: 386: 384: 382: 375: 373: 371: 367: 365: 361: 357: 349: 347: 345: 341: 337: 336:United States 333: 329: 328:Richards Spur 325: 321: 317: 313: 309: 305: 301: 298: 294: 290: 286: 282: 281: 267: 264: 261:Efremov, 1938 259: 256: 255: 253: 248: 244:Efremov, 1938 241: 240: 232: 229: 225: 221:Efremov, 1938 218: 217: 210: 207: 206: 203: 197: 194: 193: 190: 184: 181: 180: 177: 174: 171: 168: 167: 164: 161: 158: 157: 154: 151: 148: 147: 144: 141: 138: 137: 132: 127: 123: 120: 116: 112: 107: 100: 95: 90: 85: 80: 75: 70: 65: 60: 55: 50: 45: 39: 36:289–265  32: 26: 22: 19: 3746:Mesenosaurus 3745: 3711:Theriodontia 3701:Pelycosauria 3665:Niaftasuchus 3663: 3653: 3643: 3630: 3493:Dinocephalia 3482:Dinocephalia 3467:Biarmosuchia 3456:Biarmosuchia 3440: 3385: 3332: 3324: 3318:Steppesaurus 3316: 3309: 3302: 3295: 3288: 3281: 3274: 3266: 3259: 3254:Ctenorhachis 3252: 3245: 3222: 3195: 3188: 3165: 3155: 3145: 3135: 3125: 3092: 3085: 3078: 3071: 3064: 3059:Ianthasaurus 3057: 3050: 3045:Glaucosaurus 3043: 3038:Edaphosaurus 3036: 3029: 3006: 2996: 2961:Varanosaurus 2959: 2952: 2945: 2938: 2933:Echinerpeton 2931: 2924: 2917: 2910: 2835: 2825: 2815: 2805: 2795: 2785: 2772: 2728: 2721: 2714: 2707: 2700: 2692: 2685: 2665: 2660:Mesenosaurus 2659: 2658: 2651: 2644: 2637: 2630: 2610: 2603: 2595: 2588: 2581: 2576:Ascendonanus 2574: 2567: 2560: 2515:Trichasaurus 2513: 2506: 2499: 2492: 2485: 2478: 2471: 2464: 2459:Ennatosaurus 2457: 2452:Datheosaurus 2450: 2443: 2436: 2429: 2422: 2415: 2410:Arisierpeton 2408: 2403:Angelosaurus 2401: 2396:Alierasaurus 2394: 2374: 2367: 2360: 2352: 2345:Eothyrididae 2318: 2170: 2164:Superclass: 2093: 2082:the original 2077: 2031: 2027: 2021: 1994: 1984: 1957: 1947: 1914: 1910: 1882:cite journal 1857: 1853: 1847: 1806: 1802: 1796: 1763: 1759: 1752: 1709: 1705: 1698: 1673: 1669: 1663: 1630: 1626: 1619: 1603: 1597: 1580: 1579:Mesenosaurus 1576: 1528: 1524: 1454:Mesenosaurus 1453: 1452:occurred in 1446: 1442:Mesenosaurus 1441: 1438:Mesenosaurus 1437: 1429:Mesenosaurus 1428: 1427: 1424:Paleobiology 1414: 1304: 1303: 1287: 1286: 1263: 1262: 1221: 1220: 1204: 1203: 1180: 1179: 1129: 1128: 1127: 1111: 1110: 1098:(BP/1/5678) 1093: 1091: 1068: 1067: 1055: 1034: 1033: 1010: 1009: 956: 955: 938: 937: 914: 913: 890: 889: 830: 815: 792: 791: 769: 727: 726: 709: 708: 675: 674: 658: 657: 639:Basicranodon 638: 632: 622: 618: 617: 597: 593: 591: 585: 581: 577: 573: 569: 567: 558: 556: 551: 515: 512:Mesenosaurus 511: 507: 503: 500: 494: 484: 472:Mesenosaurus 471: 468:Mesenosaurus 467: 461:Mesenosaurus 460: 404:Mesenosaurus 403: 401: 395: 381:Mesenosaurus 380: 379: 369: 368: 364:Alfred Romer 360:Mesenosaurus 359: 356:Ivan Efremov 353: 343: 339: 315: 299: 297:type species 280:Mesenosaurus 279: 278: 277: 265: 257: 238: 237: 228:Type species 216:Mesenosaurus 215: 214: 169: 118: 25:Mesenosaurus 24: 18: 3551:Gorgonopsia 3540:Gorgonopsia 3525:dicynodonts 3519:Anomodontia 3508:Anomodontia 3311:Sphenacodon 3290:Macromerion 3080:Ramodendron 3066:Lupeosaurus 2926:Clepsydrops 2919:Baldwinonus 2884:Metopophora 2827:Mastersonia 2817:Knoxosaurus 2745:Metopophora 2653:Heleosaurus 2548:Varanopidae 2376:Vaughnictis 2354:Asaphestera 2335:Caseasauria 1418:Olson’s gap 1161:Varanopinae 998:Varanopidae 771:Caseasauria 711:Captorhinus 633:Below is a 619:M. efremovi 594:M. efremovi 582:M. efremovi 570:M. efremovi 376:Description 344:M. efremovi 308:Mezen River 293:Varanopidae 266:M. efremovi 195:Subfamily: 189:Varanopidae 3850:Varanopids 3844:Categories 3699:See also: 3655:Kamagorgon 3645:Dinosaurus 3609:Cynodontia 3598:Cynodontia 3425:Therapsida 3412:Therapsida 3355:see below↓ 3346:Therapsida 3276:Dimetrodon 3224:Shashajaia 3008:Milosaurus 2940:Ophiacodon 2787:Dimacrodon 2754:see below↓ 2702:Ruthiromia 2687:Aerosaurus 2597:Nitosaurus 2590:Dendromaia 2562:Apsisaurus 2487:Martensius 2473:Euromycter 2254:see below↓ 2034:(2): 162. 1493:References 940:Ophiacodon 412:premaxilla 330:locality ( 324:Artinskian 3613:includes 3523:includes 3442:Raranimus 3297:Neosaurus 2998:Ianthodon 2723:Varanodon 2583:Eoscansor 2494:Oromycter 2438:Caseopsis 2431:Caseoides 2369:Oedaleops 2299:Synapsida 2286:Synapsida 2245:Synapsida 2166:Tetrapoda 2152:Kingdom: 2136:Synapsida 2048:0045-8511 1931:0031-0220 1874:0024-1164 1831:0272-4634 1788:133846070 1780:0031-0220 1744:1943-2682 1655:0031-0182 1589:633882190 751:Synapsida 635:cladogram 629:Phylogeny 623:M. romeri 598:M. romeri 586:M. romeri 516:M. romeri 508:M. romeri 479:Discovery 447:pterygoid 350:Etymology 340:M. romeri 258:M. romeri 176:Synapsida 149:Kingdom: 143:Eukaryota 3775:10670041 3761:Q3278592 3755:Wikidata 3721:Category 3283:Eosyodon 3268:Cutleria 3137:Haptodus 3127:Cutleria 3052:Gordodon 2807:Gorgodon 2797:Driveria 2730:Watongia 2716:Varanops 2639:Cabarzia 2632:Anningia 2387:Caseidae 2362:Eothyris 2160:Chordata 2158:Phylum: 2154:Animalia 2098:Archived 2013:17105089 1976:17105089 1939:91871872 1839:59023934 1690:84706899 1633:: 1–11. 1555:31824730 1460:See also 1434:diapsids 497:skeleton 457:quadrate 410:Slender 332:Oklahoma 304:Kazanian 250:Species 182:Family: 163:Chordata 159:Phylum: 153:Animalia 139:Domain: 3814:4128063 3801:1255093 3788:4819442 3615:mammals 2466:Eocasea 2175:Amniota 2056:1439431 2004:1273351 1967:1273351 1854:Lethaia 1811:Bibcode 1714:Bibcode 1706:Geology 1635:Bibcode 1546:6837192 690:Amniota 592:Though 563:Permian 320:Permian 289:amniote 208:Genus: 31:Permian 2605:Pyozia 2054:  2046:  2028:Copeia 2011:  2001:  1974:  1964:  1937:  1929:  1872:  1837:  1829:  1786:  1778:  1742:  1688:  1653:  1587:  1553:  1543:  453:Stapes 314:, and 312:Russia 3827:37777 3796:IRMNG 2424:Casea 2171:Clade 2052:JSTOR 1935:S2CID 1835:S2CID 1784:S2CID 1686:S2CID 943:spp. 714:spp. 406:are: 387:Skull 285:genus 170:Clade 3783:GBIF 3607:see 3584:see 3549:see 3517:see 3491:see 3465:see 2231:see 2204:see 2044:ISSN 2032:1957 2009:PMID 1972:PMID 1927:ISSN 1911:PalZ 1888:link 1870:ISSN 1827:ISSN 1776:ISSN 1760:PalZ 1740:ISSN 1651:ISSN 1585:OCLC 1551:PMID 596:and 44:Preęž’ 3770:EoL 2036:doi 1999:PMC 1962:PMC 1919:doi 1862:doi 1819:doi 1768:doi 1730:hdl 1722:doi 1678:doi 1643:doi 1631:475 1608:doi 1541:PMC 1533:doi 338:). 287:of 3846:: 3824:: 3811:: 3798:: 3785:: 3772:: 3757:: 2173:: 2096:. 2092:. 2076:. 2050:. 2042:. 2030:. 2007:. 1993:. 1970:. 1956:. 1933:. 1925:. 1915:93 1913:. 1896:^ 1884:}} 1880:{{ 1868:. 1858:34 1856:. 1833:. 1825:. 1817:. 1807:24 1805:. 1782:. 1774:. 1764:92 1762:. 1738:. 1728:. 1720:. 1710:38 1708:. 1684:. 1674:10 1672:. 1649:. 1641:. 1629:. 1583:. 1563:^ 1549:. 1539:. 1527:. 1523:. 1501:^ 1440:. 641:: 625:. 506:. 366:. 334:, 326:) 306:) 172:: 94:Pg 38:Ma 33:, 3661:† 3651:† 3641:† 3572:† 3537:† 3505:† 3479:† 3453:† 3438:† 3337:? 3329:? 3321:? 3271:? 3235:† 3220:† 3178:† 3163:† 3153:† 3143:† 3133:† 3123:† 3019:† 3004:† 2994:† 2900:† 2840:? 2833:† 2823:† 2813:† 2803:† 2793:† 2783:† 2697:? 2600:? 2550:? 2545:† 2357:? 2337:? 2332:† 2323:? 2316:† 2128:e 2121:t 2114:v 2058:. 2038:: 2015:. 1978:. 1941:. 1921:: 1890:) 1876:. 1864:: 1841:. 1821:: 1813:: 1790:. 1770:: 1746:. 1732:: 1724:: 1716:: 1692:. 1680:: 1657:. 1645:: 1637:: 1610:: 1591:. 1557:. 1535:: 1529:6 1092:? 322:( 235:† 212:† 199:† 186:† 99:N 89:K 84:J 79:T 74:P 69:C 64:D 59:S 54:O 49:ęž’

Index

Permian
Ma
Preęž’
ęž’
O
S
D
C
P
T
J
K
Pg
N

Scientific classification
Edit this classification
Eukaryota
Animalia
Chordata
Synapsida
Varanopidae
Mycterosaurinae
Mesenosaurus
Type species
genus
amniote
Varanopidae
type species
Kazanian

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