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Sphenotus washingtonensis

Bivalvia - Grammysiidae

Taxonomy
Sphenotus washingtonense was named by Girty (1910). Its type specimen is USNM 155899, a shell, and it is a 3D body fossil.

It was corrected as Sphenotus washingtonensis by Pojeta (1969) and Hoare (1993).

Sister species lacking formal opinion data
S. altidorsata, S. solenoi

Synonymy list
YearName and author
1910Sphenotus washingtonense Girty pp. 224 – 225
1969Sphenotus washingtonensis Pojeta pp. 17 – 18 figs. pl. 3 f. 9-11
1993Sphenotus washingtonensis Hoare p. 390 fig. 7.2

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
classBivalvia
—Eubivalvia
RankNameAuthor
subclassAutobranchia(Groblen 1894)
infraclassHeteroconchia(Gray 1854)
—CardiomorphiFerussac 1822
—CardioniFerussac 1822
—CardiidiaFerussac 1822
superfamilyGrammysioideaMiller 1877
familyGrammysiidaeMiller 1877
genusSphenotus
specieswashingtonensis()

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.

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Diagnosis
ReferenceDiagnosis
R. D. Hoare 1993Sphenotus with subparallel dorsal and ventral margins; anterior margin sharply convex; posterior margin doubly truncate, ventral portion sloping anteriorly, dorsal portion sloping posteriorly; escutcheon appears to be present; distinct umbonal carina extends to posteroventral margin; second carina divides posterodorsal area; surface ornamented by fine growth lines, angulated as they cross carinae; internal features not observed.