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Taxonomy
Brachidontes bifurcatus was named by Popenoe (1937). Its type specimen is CIT (IP) 3425 and is a 3D body fossil. Its type locality is CIT loc. 974, Aliso-Santiago Creek Divide, which is in a Campanian coastal sandstone in the Williams Formation of California.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1937 | Brachidontes bifurcatus Popenoe p. 383 figs. Plate 46, figure 2 |
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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.
†Brachidontes bifurcatus Popenoe 1937
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. P. Popenoe 1937 | Shell small, thin, inflated; beaks low, incurved, markedly anterior; anterior end narrow, inflated, rounded; dorsal margin straight, two-thirds the length of the entire shell; posterior margin gently convex, obliquely truncate; ventral margin slightly emarginate; posterior umbonal ridge sharply angular near the beaks, becoming progressively lower and more broadly rounded toward the posteroventral border; sculpture consisting of numerous close-set radiating flat-topped ribs, separated by interspaces as wide as the ribs, strongly developed on the posterodorsal slope of the shell and on the umbonal ridge, where they bifurcate in some individuals; radial sculpture abruptly disappears slightly in advance of the umbonal angulation; sculpure on the anterior portion of the shell usually of growth lines only, or with very minute radial striae in addition; internal shell border crenate; dentition unknown. |