Bivalvia - Arcida - Arcidae

Alternative combinations: Limopsis declivis, Pectunculus declivis, Trigonarca declivis, Trinacria declivis

Belongs to Halonanus according to J. Gardner 1945

See also Harris 1919

Sister taxon: Halonanus pulchrus

Distribution: found only at Sta. 4593 - Deearadeaux [Barnwell Sand] (Eocene of South Carolina)

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Specimen images are retrieved through the ePANDDA API.