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Plesiacanthoceras
Taxonomy
Plesiacanthoceras was named by Haas (1964) [Sepkoski's age data: K Ceno-m K Ceno-u Sepkoski's reference number: 901]. Its type is Metoicoceras wyomingensis.
It was reranked as Dunveganoceras (Plesiacanthoceras) by Wright et al. (1996).
It was assigned to Acanthoceratinae by Kennedy and Cobban (1990); to Dunveganoceras by Wright et al. (1996); to Mammitinae by Cooper (1998); and to Ammonoidea by Sepkoski (2002).
It was reranked as Dunveganoceras (Plesiacanthoceras) by Wright et al. (1996).
It was assigned to Acanthoceratinae by Kennedy and Cobban (1990); to Dunveganoceras by Wright et al. (1996); to Mammitinae by Cooper (1998); and to Ammonoidea by Sepkoski (2002).
Synonymy list
| Year | Name and author |
|---|---|
| 1964 | Plesiacanthoceras Haas p. 610 |
| 1990 | Plesiacanthoceras Kennedy and Cobban p. 402 |
| 1996 | Dunveganoceras (Plesiacanthoceras) Wright et al. p. 156 |
| 1998 | Plesiacanthoceras Cooper |
| 2002 | Plesiacanthoceras Sepkoski |
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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. †Plesiacanthoceras Haas 1964
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†Dunveganoceras (Plesiacanthoceras) wyomingense Reagan 1924
†Plesiacanthoceras bellsanum Stephenson 1953
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. W. Wright et al. 1996 | Differs from Acanthoceras only in early loss of siphonal tubercles, asymmetry of tubercles in side view, and exaggerated ventrolateral horns on last whorl. |