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Meekoceras
Taxonomy
Meekoceras was named by Hyatt (1879) [Sepkoski's age data: Tr Olen-l Sepkoski's reference number: 302]. It is the type genus of Meekocerataceae.
It was assigned to Ptychitinae by von Mojsisovics (1882); to Pinacoceratidae by Kittl (1903); to Meekoceratinae by Nakazawa and Bando (1968); to Meekoceratidae by Diener (1897), Spath (1934), Tozer (1994); to Ceratitida by Sepkoski (2002); and to Prionitidae by Brayard et al. (2013).
It was assigned to Ptychitinae by von Mojsisovics (1882); to Pinacoceratidae by Kittl (1903); to Meekoceratinae by Nakazawa and Bando (1968); to Meekoceratidae by Diener (1897), Spath (1934), Tozer (1994); to Ceratitida by Sepkoski (2002); and to Prionitidae by Brayard et al. (2013).
Species
M. bittneri, M. bonnevillense, M. boreale, M. cadoricum, M. caprilense, M. caucasium, M. corvarense, M. cristatum, M. darvazicum, M. davisi, M. dubium, M. fulguratum, M. gracilitatis (syn. Clypeoceras pusillum, Dagnoceras bridgesi, M. sylvanum, M. radiosus), M. haydeni, M. infrequens, M. japonicum, M. kraffti, M. luchnikovi, M. marginale, M. millardense, M. mushbachanum, M. nakazawai, M. olivieri, M. orientale, M. pusillum, M. rota, M. solitarium, M. tardum
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1879 | Meekoceras Hyatt |
| 1882 | Meekoceras von Mojsisovics |
| 1897 | Meekoceras Diener |
| 1903 | Meekoceras Kittl |
| 1934 | Meekoceras Spath |
| 1968 | Meekoceras Nakazawa and Bando |
| 1994 | Meekoceras Tozer p. 70 |
| 2002 | Meekoceras Sepkoski |
| 2013 | Meekoceras Brayard et al. p. 200 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Meekoceras Hyatt 1879
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†Meekoceras bittneri Shevyrev 1990
†Meekoceras bonnevillense Smith 1932
†Meekoceras boreale Diener 1895
†Meekoceras cadoricum von Mojsisovics 1869
†Meekoceras caprilense von Mojsisovics 1878
†Meekoceras caucasium Shevyrev 1995
†Meekoceras corvarense Laube 1869
†Meekoceras cristatum Smith 1932
†Meekoceras darvazicum Shevyrev 1990
†Meekoceras davisi Smith 1932
†Meekoceras dubium Krafft 1909
†Meekoceras fulguratum Waagen 1895
†Meekoceras gracilitatis White 1879
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Invalid names: Clypeoceras pusillum Shevyrev 1990 [synonym], Dagnoceras bridgesi Smith 1932 [synonym], Meekoceras radiosus Smith 1932 [synonym], Meekoceras sylvanum Smith 1932 [synonym]
†Meekoceras haydeni Smith 1932
†Meekoceras infrequens Krafft 1909
†Meekoceras japonicum Shimizu and Jimbo 1933
†Meekoceras kraffti Shevyrev 1990
†Meekoceras luchnikovi Shevyrev 1990
†Meekoceras marginale Arthaber 1908
†Meekoceras millardense Brayard et al. 2013
†Meekoceras mushbachanum White 1879
†Meekoceras nakazawai Bando 1968
†Meekoceras olivieri Brayard et al. 2013
†Meekoceras orientale Shimizu and Jimbo 1933
†Meekoceras pusillum Shevyrev 1990
†Meekoceras rota Waagen 1895
†Meekoceras solitarium von Krafft 1909
†Meekoceras tardum Waagen 1895
Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 139 | 33.6 | 6.80 | 88.4 | 37.2 | 15.5 | |
| shell diameter | 139 | 62.1 | 14.4 | 192.0 | 67.4 | 31.0 | |
| shell inflation | 139 | 10.0 | 2.10 | 54.0 | 11.0 | 8.16 |
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Kiessling 2003 | |||||
Age range: base of the Griesbachian to the top of the Ladinian or 251.90200 to 237.00000 Ma
Collections (145 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Griesbachian | India | M. boreale (85463) M. plicatilis, M. sp. (44019) | |
| Induan | Nepal (Byans) | M. sp. (214668) | |
| Induan | India | M. boreale (211001) | |
| Induan | Iran | M. sp. (118295) | |
| Early/Lower Triassic | USA (Nevada) | M. gracilitatis, M. mushbachanum (33313) | |
| Early/Lower Triassic | USA (Idaho) | M. gracilitatis, Dagnoceras haydeni, M. sylvanum, Dagnoceras bridgesi, M. mushbachanum, M. cristatum (33286) M. gracilitatis, M. sylvanum, Dagnoceras bridgesi, M. cristatum (33285) | |
| Early/Lower Triassic | USA (Utah) | M. davisi (33315) | |
| Dienerian - Spathian | China | M. lingyunense, M. kwangsianum, M. smithi (44006) | |
| Smithian | USA (Idaho) | M. gracilitatis (120985 120986) M. gracilitatis, Dagnoceras haydeni, M. sylvanum, M. mushbachanum, M. cristatum (33293) M. gracilitatis, M. mushbachanum (33292) M. gracilitatis, M. sylvanum, M. cristatum, Dagnoceras bonnevillense (33288) | |
| Smithian | China (Xizang) | M. sp. (229760 229761) | |
| Smithian | China (Gunagxi) | M. densistratum, M. smithi, M. tsotengense, M. multiplicatum (44014) | |
| Smithian | Japan | M. gracilitatus (115247) M. sp. A, M. sp. B (101745) M. sp., M. japonicum, M. orientale (101735) | |
| Smithian | China (Guangxi) | M. infrequense (44015) M. kaowaiense (44016) | |
| Smithian | Canada (Nunavut) | M. gracilitatis (43848 61943 61947 98562 98564 105192 137945) | |
| Smithian | Indonesia (Timor) | M. infrequens (204266) M. mushbachanum (205630) | |
| Smithian | Canada (British Columbia) | M. haydeni (105193 141720) | |
| Smithian | USA (Utah) | M. gracilitatis (156011 156014 156019 156021 156040 156041 156043 156044 156045 156049 156051 156052 156057 156059 156067 156068 156074) M. millardense (156039) M. olivieri (156038) | |
| Smithian | Pakistan | M. fulguratum (143641) M. gracilitatis (102322 139145 139165 139166 139167 139168 139169 139428) M. rota (143629 143630) M. sp. A (102306 102307 102314 102324 102326) M. tardum (143639) | |
| Smithian | Russian Federation | M. gracilitatis (107043 177009 177010) M. gracilitatis, M. caucasium (99538) | |
| Smithian | Timor-Leste | M. sp., M. nakazawai (213495) | |
| Smithian | Madagascar | M. sp. (213433) | |
| Smithian | Afghanistan | M. gracilitatis (41669) | |
| Smithian | China (Qinghai) | M. gracilitatis (103151 103152 103153) | |
| Smithian | USA (California) | M. gracilitatis, Clypeoceras pusillum (33298) | |
| Smithian | India (Kashmir) | M. gracilitatis (115381) M. sp. (115382) | |
| Smithian | USA (Nevada) | M. gracilitatis (97117 97118 97119 97120 97121) M. gracilitatus (61515 62096 62097 62098) | |
| Smithian | Tajikistan | M. bittneri (97869) M. bittneri, M. kraffti (97868) M. bittneri, M. kraffti, M. darvazicum (97867) M. pusillum, M. luchnikovi (97866) | |
| Smithian | China (Anhui) | M. sp. (95655 95656 95657 111493 149182 149184 149188 149189 149191) | |
| Smithian | USA (Alaska) | M. gracilitatis (44394 44415) | |
| Smithian | Afghanistan (Pakhtia) | M. gracilitatis (44121) | |
| Smithian | Russian Federation (Primorye) | M. boreale (47207 47210 47215 47216 47220 47264 47265 47267 47268) M. gracilitatis (47217 47233 47257) M. sp. (47211 47232 47241 47246 47269 47272 47275) | |
| Smithian | Oman | M. sp. (127394) | |
| Olenekian | Italy (South Tyrol) | M. caprilense (212348) | |
| Olenekian | Italy (Belluno) | M. caprilense (212349) | |
| Olenekian | Italy (Bergamo) | M. caprilense (212347) | |
| Olenekian | Russian Federation | M. boreale (61959 61961) | |
| Olenekian | Afghanistan (Pakhtia) | Meekoceras indet. (44131) | |
| Olenekian | Svalbard and Jan Mayen (Barentsøya) | M. corrugatum (212890) | |
| Spathian | Indonesia | M. sp. (111020) | |
| Spathian | Greece | M. gracilitatis (112609) | |
| Spathian | India | M. fulguratum (210994) | |
| Spathian | China (Gunagxi) | M. sp. (44003) | |
| Spathian | Russian Federation | M. sp. (212505) | |
| Spathian | Albania | M. marginale (97000) | |
| Anisian | Italy | M. cadoricum (136960) | |
| Anisian | Italy (Belluno) | M. cadoricum (211760) | |
| Ladinian | Italy (South Tyrol) | M. corvarense (205129 212343) |