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Polyptychoceras (Polyptychoceras) obstrictum
Taxonomy
Hamites obstrictus was named by Jimbo (1894).
It was recombined as Diplomoceras obstrictum by Anderson (1958); it was recombined as Polyptychoceras obstrictum by Matsumoto (1959); it was recombined as Polyptychoceras (Polyptychoceras) obstrictum by Wright et al. (1996).
It was recombined as Diplomoceras obstrictum by Anderson (1958); it was recombined as Polyptychoceras obstrictum by Matsumoto (1959); it was recombined as Polyptychoceras (Polyptychoceras) obstrictum by Wright et al. (1996).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1894 | Hamites obstrictus Jimbo p. 38 figs. Pl. VIII [XXIV], Fig. 1, 1a, 1b |
| 1958 | Diplomoceras obstrictum Anderson p. 199 |
| 1959 | Polyptychoceras obstrictum Matsumoto p. 165 |
| 1996 | Polyptychoceras (Polyptychoceras) obstrictum Wright et al. p. 253 figs. Fig. 197, 3e |
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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.
†Polyptychoceras (Polyptychoceras) obstrictum Jimbo 1894
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Diagnosis
No diagnoses are available