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Retroceramus (Fractoceramus)
Taxonomy
Fractoceramus was named as a genus. It is not extant.
It was reranked as Retroceramus (Fractoceramus) by Cox et al. (1969).
It was assigned to Retroceramus by Cox et al. (1969); and to Pterioida by Sepkoski (2002).
It was reranked as Retroceramus (Fractoceramus) by Cox et al. (1969).
It was assigned to Retroceramus by Cox et al. (1969); and to Pterioida by Sepkoski (2002).
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1969 | Retroceramus (Fractoceramus) Cox et al. p. N320 |
| 2002 | Fractoceramus 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.
Subg. †Retroceramus (Fractoceramus)
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Diagnosis
No diagnoses are available