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Tarrantoceras
Taxonomy
Tarrantoceras was named by Stephenson (1955) [Sepkoski's age data: K Ceno-m K Ceno-u Sepkoski's reference number: 901]. Its type is Mantelliceras sellardsi.
It was assigned to Acanthoceratidae by Cobban (1988); to Acanthoceratinae by Cooper (1978), Kennedy et al. (1988), Kennedy and Cobban (1990) and Wright et al. (1996); and to Ammonoidea by Sepkoski (2002).
It was assigned to Acanthoceratidae by Cobban (1988); to Acanthoceratinae by Cooper (1978), Kennedy et al. (1988), Kennedy and Cobban (1990) and Wright et al. (1996); and to Ammonoidea by Sepkoski (2002).
Synonymy list
| Year | Name and author |
|---|---|
| 1955 | Tarrantoceras Stephenson p. 59 |
| 1978 | Tarrantoceras Cooper p. 92 |
| 1988 | Tarrantoceras Cobban p. 2 |
| 1988 | Tarrantoceras Kennedy et al. p. 40 |
| 1990 | Tarrantoceras Kennedy and Cobban p. 391 |
| 1996 | Tarrantoceras Wright et al. p. 158 |
| 2002 | Tarrantoceras 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. †Tarrantoceras Stephenson 1955
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Subg. †Tarrantoceras (Sumitomoceras) Matsumoto 1969
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†Sumitomoceras bentonianum Cragin 1893
†Sumitomoceras conlini Wright and Kennedy 1981
†Tarrantoceras (Sumitomoceras) faustum Matsumoto 1969
Subg. †Tarrantoceras (Tarrantoceras) Stephenson 1955
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†Tarrantoceras (Tarrantoceras) sellardsi Adkins 1928
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Invalid names: Tarrantoceras lillianense Stephenson 1955 [synonym], Tarrantoceras multicostatum Stephenson 1955 [synonym], Tarrantoceras rotatile Stephenson 1955 [synonym], Tarrantoceras stantoni Stephenson 1955 [synonym]
†Tarrantoceras cuspidum Stephenson 1953
†Tarrantoceras exile Kennedy and Cobban 1990
†Tarrantoceras flexicostatum Cobban 1988
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. W. Wright et al. 1996 | Small, compressed, and evolute; with ribs close to distant, rectiradiate, straight or slightly sinuous, branching from umbilical tubercles or long and short, and transverse across arched or flat venter; early whorls with umbilical bullae, inner and close outer ventrolateral tubercles, and slight siphonal tubercles. Suture with short, broad, and rather simple saddles, the second lateral commonly projecting beyond the rest. |