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Didymoceras
Taxonomy
Didymoceras was named by Hyatt (1900) [Sepkoski's age data: K Sant-u K Maes-l Sepkoski's reference number: 971].
It was reranked as Nostoceras (Didymoceras) by Wright et al. (1996).
It was assigned to Nostoceratinae by Wright (1979); to Turrilitidae by Zaborski (1985); to Nostoceras by Wright et al. (1996); to Ammonoidea by Sepkoski (2002); and to Nostoceratidae by Reyment (1955), Atabekyan and Khakimov (1976), Morozumi (1985), Kennedy and Cobban (1993), Kennedy and Cobban (1994), Kennedy and Bilotte (1995), Kennedy and Cobban (1997), Kennedy and Summesberger (1999), Kennedy (2000), Kennedy et al. (2000), Kennedy et al. (2000), Ifrim et al. (2015) and Shigeta (2016).
It was reranked as Nostoceras (Didymoceras) by Wright et al. (1996).
It was assigned to Nostoceratinae by Wright (1979); to Turrilitidae by Zaborski (1985); to Nostoceras by Wright et al. (1996); to Ammonoidea by Sepkoski (2002); and to Nostoceratidae by Reyment (1955), Atabekyan and Khakimov (1976), Morozumi (1985), Kennedy and Cobban (1993), Kennedy and Cobban (1994), Kennedy and Bilotte (1995), Kennedy and Cobban (1997), Kennedy and Summesberger (1999), Kennedy (2000), Kennedy et al. (2000), Kennedy et al. (2000), Ifrim et al. (2015) and Shigeta (2016).
Species
D. angulatum, D. aurarium, D. awajiense, D. binodosum, D. californicum, D. cheyenense, D. cheyennense, D. cochleatus, D. donezianum, D. draconis, D. hidakense, D. hornbyense, D. nebrascense (syn. Emperoceras beecheri, Emperoceras simplicostatum), D. newtoni, D. nicolletii, D. platycostatum, D. stevensoni, D. subtuberculatum, D. tenuicostatus, D. tortus, D. tricostatus, D. umbilicatus, D. uncus, D. vancouverensis (syn. D. fresnoense), D. vespertinus, D. whiteavesi, Emperoceras cooperii, Nostoceras (Didymoceras) attenuatum, Nostoceras (Didymoceras) densecostatum, Nostoceras (Didymoceras) obtusum, Nostoceras (Didymoceras) postremum, Nostoceras (Didymoceras) varium
Species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1894 | Emperoceras Hyatt p. 575 |
| 1900 | Didymoceras Hyatt |
| 1955 | Didymoceras Reyment p. 13 |
| 1976 | Didymoceras Atabekyan and Khakimov p. 43 |
| 1979 | Didymoceras Wright p. 294 |
| 1985 | Didymoceras Morozumi p. 34 |
| 1985 | Didymoceras Zaborski p. 14 |
| 1993 | Didymoceratoides Kennedy and Cobban p. 90 |
| 1993 | Didymoceras Kennedy and Cobban p. 421 |
| 1994 | Didymoceras Kennedy and Cobban p. 1290 |
| 1995 | Didymoceras Kennedy and Bilotte p. 364 |
| 1996 | Nostoceras (Didymoceras) Wright et al. p. 247 |
| 1997 | Didymoceras Kennedy and Cobban p. 67 |
| 1999 | Didymoceras Kennedy and Summesberger p. 26 |
| 2000 | Didymoceras Kennedy p. 469 |
| 2000 | Didymoceras Kennedy et al. p. 9 |
| 2000 | Didymoceras Kennedy et al. p. 6 |
| 2002 | Didymoceras Sepkoski |
| 2002 | Emperoceras Sepkoski |
| 2015 | Didymoceras Ifrim et al. p. 246 |
| 2016 | Didymoceras Shigeta p. 345 |
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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. †Didymoceras Hyatt 1900
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†Didymoceras angulatum Meek and Hayden 1860
†Didymoceras aurarium Kennedy et al. 2000
†Didymoceras awajiense Yabe 1901
†Didymoceras binodosum Kennedy and Cobban 1993
†Didymoceras californicum Anderson 1958
†Didymoceras cheyenense Meek and Hayden 1856
†Didymoceras cheyennense Meek and Hayden 1856
†Didymoceras cochleatus Meek and Hayden 1858
†Didymoceras donezianum Michailov 1951
†Didymoceras draconis Stephenson 1941
†Didymoceras hidakense Shigeta 2016
†Didymoceras hornbyense Whiteaves 1876
†Didymoceras nebrascense Meek and Hayden 1856
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Invalid names: Emperoceras beecheri Hyatt 1894 [synonym], Emperoceras simplicostatum Whitfield 1902 [synonym]
†Didymoceras newtoni Whitfield 1877
†Didymoceras nicolletii Hall and Meek 1855
†Didymoceras platycostatum Kennedy and Cobban 1993
†Didymoceras stevensoni Whitfield 1877
†Didymoceras subtuberculatum Howarth 1965
†Didymoceras tenuicostatus Meek and Hayden 1858
†Didymoceras tortus Meek and Hayden 1858
†Didymoceras tricostatus Whitfield 1897
†Didymoceras umbilicatus Meek and Hayden 1858
†Didymoceras uncus Meek and Hayden 1858
†Didymoceras vancouverensis Gabb 1864
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Invalid names: Didymoceras fresnoense Anderson 1958 [synonym]
†Didymoceras vespertinus Conrad 1874
†Didymoceras whiteavesi Anderson 1958
†Nostoceras (Didymoceras) attenuatum Brunnschweiler 1966
†Nostoceras (Didymoceras) densecostatum Wiedmann 1962
†Nostoceras (Didymoceras) obtusum Howarth 1965
†Nostoceras (Didymoceras) postremum Blaszkiewicz 1980
†Nostoceras (Didymoceras) varium Blaszkiewicz 1980
Invalid names: Didymoceratoides Kennedy and Cobban 1993 [synonym], Emperoceras Hyatt 1894 [synonym]
Diagnosis
No diagnoses are available