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Ambocardia delta
Taxonomy
Isocardia delta was named by Popenoe (1937). Its type specimen is CIT (IP) 3436 and is a 3D body fossil. Its type locality is CIT loc. 1164, Santiago Canyon, Santa Ana Mountains, which is in a Turonian marine horizon in the Ladd Formation of California.
It was recombined as Glossus delta by Sundberg (1980); it was recombined as Ambocardia delta by Saul (1996).
It was recombined as Glossus delta by Sundberg (1980); it was recombined as Ambocardia delta by Saul (1996).
Synonymy list
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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.
†Ambocardia delta Popenoe 1937
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| W. P. Popenoe 1937 | Shell of medium size, thin, fragile, greatly inflated; beaks very high, prominent, distant, spirally coiled, prosogyrous; anterior dorsal margin deeply concave below the beaks; anterior extremity obtuse and rounded; ventral margin broadly curved; posterior extremity meeting the ventral margin at an abrupt angle and merging with the dorsal posterior border in a sweeping curve; dorsal posterior slope and lateral face of the shell meeting along a rounded curving angulation extending from the beaks to the ventral posterior border; ligament narrow, rather short, external; lunule and escutcheon undefined; pallial line unknown. Dentition of the right valve consists of two curved laminar teeth arranged parallel to the hinge-line, situated one above the other, separated by a groove hat receives the ventral cardinal tooth of the left valve; left valve also with two laminar horizontal cardinal teeth, the posterior and dorsal tooth extending from the hinge-line posteroven trally; anterior and ventral cardinal parallel to the hinge border below the beaks, separated from the hinge border by a narrow groove, excavated on the ventral surface; lateral teeth apparently absent. |