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Didymoceras stevensoni

Cephalopoda - Ammonitida - Nostoceratidae

Taxonomy
Helicoceras stevensoni was named by Whitfield (1877). It is a compression fossil.

It was recombined as Didymoceras stevensoni by Cobban (1970), Kennedy and Bilotte (1995), Kennedy and Cobban (1997) and Kennedy et al. (2000).

Sister species lacking formal opinion data
D. abyssinus, D. indicum

Synonymy list
YearName and author
1877Helicoceras stevensoni Whitfield p. 39
1970Didymoceras stevensoni Cobban p. D72 figs. 1a-f,l,m, 2
1995Didymoceras stevensoni Kennedy and Bilotte p. 366
1997Didymoceras stevensoni Kennedy and Cobban p. 69 figs. 5.6-5.8, 5.13-5.15, 5.18, 5.19, 8.4-8.11
2000Didymoceras stevensoni Kennedy et al. p. 20

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
classCephalopodaCuvier 1797
RankNameAuthor
subclassAmmonoidea()
orderAmmonitida
suborderAncyloceratinaWiedmann 1966
superfamilyTurrilitoidea(Gill 1871)
familyNostoceratidaeHyatt 1894
genusDidymocerasHyatt 1900
speciesstevensoni(Whitfield 1877)

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.

†Didymoceras stevensoni Whitfield 1877
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Diagnosis
No diagnoses are available