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Birostrina
Taxonomy
Birostrina was named by De Luc and Sowerby (1821) [Sepkoski's age data: K Nc K Ceno-m
From Crampton (1996) - First appeared in the Lower Albian and ranges into the early/middle Cenomanian]. It is not extant.
It was synonymized objectively with Actinoceramus by Crampton (1996).
It was assigned to Inoceramidae by Elder and Box (1992); and to Pterioida by Sepkoski (2002).
It was synonymized objectively with Actinoceramus by Crampton (1996).
It was assigned to Inoceramidae by Elder and Box (1992); and to Pterioida by Sepkoski (2002).
Species
Species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1821 | Birostrina De Luc and Sowerby p. 184 |
| 1864 | Actinoceramus Meek p. 32 |
| 1960 | Inoceramus (Actinoceramus) Jones p. 157 |
| 1992 | Birostrina Elder and Box p. 11 |
| 2002 | Birostrina Sepkoski |
| 2003 | Actinoceramus Kiessling |
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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. †Birostrina De Luc and Sowerby 1821
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†Birostrina coptensis Casey 1961
†Birostrina tamurai Matsumoto and Noda 1986
Invalid names: Actinoceramus Meek 1864 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. P. Elder and S. E. Box 1992 | Small, thin-shelled, inequivalve inoceramid with inflated left valve having prominent prosogyrous beak; right valve weakly inflated with poorly differentiated beak; hinge line short, thin and narrow, with or without posterior auricle; surface ornamentation of fine concentric growth lines, with or without concentric rugae or microrugae; radial folds and sulcae mayor may not be present (after Matsumoto and Noda, 1986). |