Transennella puella
Similar to Transennella conradina. Transennella puella is distinguishable by its more ovate shape, deeper pallial sinus and rounded margins.
Similar to Transennella cubaniana. Transennella puella is more elongate anterio-posteriorly, is more ovate in shape, and reaches a larger overall size.
The overall shape is ovate. The anterior dorsal margin is straight and posterior dorsal margin is subconvex. The valves are equal in size and shape (equivalve), and there is no gape when they are closed. Sculpture consists of growth lines and very fine comarginal ribs anteriorly and posteriorly. The lunule extends 1/2 of the anterior dorsal margin and is defined by a very fine shallow groove. The commissural margin is slightly raised at the center of the lunule, but does not extend above the shell flank. The umbo is slightly anterior and the beaks point slightly to the anterior. The escutcheon is not well defined.
The exterior is white or light tan, and there may be brown blotches or tent marks. The exterior of the flank may also be a light tan color. The lunule may be marked by brown pigmentation. The interior is white and there is typically dark purple coloration concentrated in the adductor muscle scars, pallial sinus and along the pallial line. If the interior has purple coloration, there may be an area lacking color, forming a ray of white at the posterior. The purple coloration may descend from the umbonal cavity.
The ligament is external, extends 1/3 of the posterior dorsal margin and is supported by nymphal ridges. On the left valve, there are three cardinal teeth (2a, 2b, 4b), none of which are bifid. The posterior tooth (4b) is fused with the nymph. The anterior (2a) and central (2b) teeth meet dorsally to form an inverted "V" shape. There is also one anterior lateral tooth (A2) on the left valve. There are three cardinal teeth on the right valve: the anterior (3a) and central (1) teeth are not bifid, and the posterior tooth (3b) is lightly bifid. There are also two anterior lateral teeth (A1, A3) on the right valve. There are elongate, oblique crenulations along the ventral and anterior margins. The anterior and posterior adductor muscle scars are similar in size, but the posterior is slightly rounder. The pallial sinus is rounded and extends to the center of the hinge plate in length.