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Tarrantoceras (Sumitomoceras)
Taxonomy
Sumitomoceras was named by Matsumoto (1969). Its type is Sumitomoceras faustum.
It was synonymized subjectively with Tarrantoceras by Cooper (1978); it was reranked as Tarrantoceras (Sumitomoceras) by Wright and Kennedy (1981), Wright et al. (1996) and Gale et al. (2019).
It was assigned to Acanthoceratidae by Cobban (1988); to Acanthoceratinae by Kennedy and Cobban (1990); and to Tarrantoceras by Wright and Kennedy (1981), Wright et al. (1996) and Gale et al. (2019).
It was synonymized subjectively with Tarrantoceras by Cooper (1978); it was reranked as Tarrantoceras (Sumitomoceras) by Wright and Kennedy (1981), Wright et al. (1996) and Gale et al. (2019).
It was assigned to Acanthoceratidae by Cobban (1988); to Acanthoceratinae by Kennedy and Cobban (1990); and to Tarrantoceras by Wright and Kennedy (1981), Wright et al. (1996) and Gale et al. (2019).
Synonymy list
| Year | Name and author |
|---|---|
| 1969 | Sumitomoceras Matsumoto p. 280 |
| 1981 | Tarrantoceras (Sumitomoceras) Wright and Kennedy |
| 1988 | Sumitomoceras Cobban p. 14 |
| 1990 | Sumitomoceras Kennedy and Cobban p. 395 |
| 1996 | Tarrantoceras (Sumitomoceras) Wright et al. p. 158 |
| 2019 | Tarrantoceras (Sumitomoceras) Gale et al. p. 260 |
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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.
Subg. †Tarrantoceras (Sumitomoceras) Matsumoto 1969
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†Sumitomoceras bentonianum Cragin 1893
†Sumitomoceras conlini Wright and Kennedy 1981
†Tarrantoceras (Sumitomoceras) faustum Matsumoto 1969
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. W. Wright et al. 1996 | Siphonal tubercles disappearing early, then ventrolaterals; on body chamber ribs crossing arched venter without weakening; interspaces between some long ribs are deeper than the rest, forming shallow constrictions |