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Prothyris (Prothyris) acuticarinata

Bivalvia - Grammysiidae

Prothyris (Prothyris) acuticarinata was named by Busanus and Hoare (1991) [= Prothyris (Prothyris) acuticarinata BUSANUS, 1974, p. 248, P1. 9, figs. 6, 7. ]. Its type specimen is USNM 452317, a shell (right valve), and it is a 3D body fossil. Its type locality is Interbedded shales & limestones, Reynolds Limestone, Greer Limestone Co. quarry, which is in a Chesterian marine shale/limestone in the Reynolds Limestone Formation of West Virginia.

Sister species lacking formal opinion data

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Synonymy list
YearName and author
1991Prothyris (Prothyris) acuticarinata Busanus and Hoare pp. 474 – 472 figs. 5.16 – 5.17

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EubilateriaAx 1987
subclassAutobranchia(Groblen 1894)
infraclassHeteroconchia(Cox 1960)
CardiomorphiFerussac 1822
CardioniFerussac 1822
CardiidiaFerussac 1822
superfamilyGrammysioideaMiller 1877
familyGrammysiidaeMiller 1877

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.

J. W. Busanus and R. D. Hoare 1991Subrectangular Prothyris (Prothyris) with prominent, angular, umbonal shoulder extending from umbonal area to acutely angular posteroventral margin; posterior margin steeply sloping, nearly straight; anterior margin with small dorsally located, triangular lobe separated from rest of ventral margin by a narrow, shallow sinus, separated from shell body by narrow ridge.

Small, thin-shelled, subrectangular shell with nearly parallel dorsal and ventral margins; posterior margin abrupt, steeply sloping, forming a distinct obtuse angle with dorsal margin and acute angle with ventral margin; anterior margin with small, triangular lobe dorsally, a narrow, shallow sinus below lobe, then curving smoothly into broadly sinuous ventral margin; strong, angular umbonal shoulder extends to angle at posteroventral margin; surface with fine growth lines, some more prominent as ridges; faint lines, or ridges, radiate from umbonal area in anterior portion of shell; internal features unknown.