Earlpackardia, COOPER, 2015

Halligan, William Keith, 2023, Washington State (USA) trigoniids (Bivalvia) from the conglomerate of Patterson Lake (Early Cretaceous), PaleoBios 40 (8), pp. 1-15 : 11-12

EARLPACKARDIA COOPER, 2015 B

Diagnosis— Small to moderately large, posteriorly produced and oblong, with prominent umbones, subparallel ventral and posterodorsal margins and broadly-rounded respiratory margin; prominent/conspicuous marginal carina/angulation persisting into middle growth; flank costae fine to coarse, wavy, subno- date, irregular anteriorly and sometimes discontinuous, becoming subcommarginal to nearly horizontal by mid-flank where they fade and are replaced by fine growth lines posteriorly. Area and escutcheon in some species may be costellate in early growth but are otherwise flat and unornamented except for fine growth lines. Neocomian – Turonian (Emended from Cooper 2015b)

Referred Species— E. jacksonensis ( Packard, 1921) , p. 18, Plate 4, fig. 1. E. yeharai ( Kobayashi, 1954) , p. 77; Tashiro 1990, p. 12, plate 1, fig. 3-6, text-fig. 7. E. amagensis ( Kobayashi, 1957a) p. 360, plate 3, fig. 2; Hayami 1968, p. 178, plate 21, fig. 6.

Occurrence— Cordilleran, Oriental, and Sinian provinces ( Cooper 2015b).