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Crassatella gamma
Taxonomy
Crassatella gamma was named by Popenoe (1937). Its type specimen is CIT (IP) 3433 and is a 3D body fossil. Its type locality is LACMIP loc. 8198, Santa Ana Mountains, which is in a Turonian delta front siltstone/shale in the Ladd Formation of California.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1937 | Crassatella gamma Popenoe p. 388 figs. Plate 46, figures 13-15; plate 47, figure 1 |
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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.
†Crassatella gamma Popenoe 1937
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. P. Popenoe 1937 | Shell of moderate size, rather high, short, compressed, angular in outline; beaks not very prominent, slightly anterior to the middle of the shell, prosogyrate; lunule depressed, long, narrow, about two-thirds the length of the anterior dorsal border; anterior dorsal border nearly straight; anterior portion of ventral border rounded; posterior half of ventral border nearly straight; posterior end abruptly truncate nearly at right angles to the ventral posterior border; posterior dorsal slope comparatively broad, plane, bounded below by an abrupt umbonal angula tion; escutcheon long, narrow; sculpture of fine concentric close-set rather irregular ridges. Dentition of right valve: one strong trigonal posterior cardinal tooth directly beneath the beak bounded anteriorly by a narrow oblique socket and posteriorly by a rather deep triangular socket; anterior cardinal tooth nearly obsolete; ligament pit a triangular depression in the dorsal half of the hinge plate immediately behind the posterior cardinal tooth; anterior dorsal border bears a shallow lateral socket situated below the forward part of the lunule; posterior lateral tooth long, narrow, straight. Dentition of the left valve: anterior cardinal tooth narrow and oblique; posterior cardinal tooth rather short and thick, bounded above by the chondrophore; anterior lateral tooth short and narrow, situated below the anterior end of the Iunule; posterior lateral socket long, narrow, extending nearly the full length of the escutcheon. |