[Bivalves of the family Tancrediidae have the following characteristics; the] shell [is] small to medium-sized, smooth or with weak radial ornament, equivalve, feebly to moderately inflated, ovate or subtrigonal, more or less elongate, subequilateral to strongly inequilateral, in [the] latter case with [the] anterior end longer; [the] ligament [is] external, opisthodetic, usually short; [the] cardinal teeth [number] fundamentally two in each valve (2, 4b in LV, 3a, 3b in RV), but decreased to [a] single tooth in one or both valves in some forms by [the] extreme reduction of LV posterior (4b), of RV anterior (3a), or of both, (...); [there is a] single posterior lateral (PII) present in LV and received, below [the] dorsal margin of RV, in [a] socket which may lie between two distinct lateral teeth (PIII, PI); [the] anterior laterals, if distinguishable, (...) [consist] of laminar projections from [the] margins; [the] adductor scars [are] small; [the] pallial line [is] simple or (...) [has a] shallow sinus. "U.Trias.-U.Cret." 1, record 1, English, - Tancrediidae
[Les Lamellibranches de la] famille des Tancrediidae (...) [ont une] charnière (...) [comportant] des cardinales et des latérales postérieures. 1, record 1, French, - Tancrediidae
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