Morphologic Description: Like Bairdia but each valve with short series of transverse teeth and sockets in antero- and posterodorsal positions, in selvage of RV and selvage groove of LV. Surface smooth with abundant very tiny pits. Lateral outline of LV with broadly arched dorsal margin, broadly and obliquely rounded anterior margin, produced caudate posterior termination, straight anterodorsal segment and concave posterodorsal segment; RV with obscurely angulate tripartitie dorsal margin, anterodorsal and posterodorsal segments straight or slightly concave, posterior distinctly caudate, ventral margin slightly indented. Hinge- proper simple and usually quite thin, median bar of right valve or equal thickness throughout; muscle-scar pattern consists of 8 subcircular to subquadrate scars arranged in three horizontal rows tending to be divided for a total of 10 scars. [Bairdoppilata martyni Coryell, Sample and Jennings, 1935] (Treatise, Q205, fig. 139: 3).
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