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Alleinacin
Taxonomy
Alleinacin was named by Squires and Ritterbush (1981) [Sepkoski's age data: K u Sepkoski's reference number: ZR81]. Its type is Astarte sulcata.
It was assigned to Astartidae by Squires and Ritterbush (1981); and to Veneroida by Sepkoski (2002).
It was assigned to Astartidae by Squires and Ritterbush (1981); and to Veneroida by Sepkoski (2002).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1981 | Alleinacin Squires and Ritterbush p. 896 |
| 2002 | Alleinacin 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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. L. Squires and L. Ritterbush 1981 | Shell small, trigonal to subtrapezoidal with 11 to 12 regularly-spaced, heavy concentric ribs. Lunule and escutcheon well-defined, long and smooth. Lunule wider oAns-right valve, escutcheon wider on left valve. Beaks slightly anterior of center, prosogyrate; ligament groove short, narrow, and submerged. Dentition of right valve, a single strong cardinal and an elongate posterior lateral socket. Dentition of left valve, a single strong cardinal and an elongate anterior lateral socket. Into these sockets fit the raised beveled shell margins. |