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Didymoceras stevensoni
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), Kennedy et al. (2000) and Sealey and Lucas (2019).
It was recombined as Didymoceras stevensoni by Cobban (1970), Kennedy and Bilotte (1995), Kennedy and Cobban (1997), Kennedy et al. (2000) and Sealey and Lucas (2019).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1877 | Helicoceras stevensoni Whitfield p. 39 |
| 1970 | Didymoceras stevensoni Cobban p. D72 figs. 1a-f,l,m, 2 |
| 1995 | Didymoceras stevensoni Kennedy and Bilotte p. 366 |
| 1997 | Didymoceras stevensoni Kennedy and Cobban p. 69 figs. 5.6-5.8, 5.13-5.15, 5.18, 5.19, 8.4-8.11 |
| 2000 | Didymoceras stevensoni Kennedy et al. p. 20 |
| 2019 | Didymoceras stevensoni Sealey and Lucas p. 184 figs. 118F-H,L-N |
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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.
†Didymoceras stevensoni Whitfield 1877
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Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Kiessling 2003 | |||||
Age range: Late/Upper Campanian or 83.50000 to 70.60000 Ma
Collections (12 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Campanian | USA (Montana) | Didymoceras stevensoni (88465 213163 213164 213171) | |
| Late/Upper Campanian | USA (Wyoming) | Didymoceras stevensoni (1645 88441) | |
| Late/Upper Campanian | USA (Delaware) | Didymoceras stevensoni (183120) | |
| Late/Upper Campanian | France | Didymoceras stevensoni (82889) | |
| Late/Upper Campanian | USA (Colorado) | Didymoceras stevensoni (88467 88468 88471) | |
| Middle Campanian | USA (Delaware) | Didymoceras stevensoni (35049) |