Shell small, solid, equivalve, inequilateral. Outline obliquely oval, with beaks well in front of the midline. Posterior part expanded and roundly angulated. Sculpture of about 35-40 strong ribs, bearing thin scales, which become longer on posterior part of shell.
external shell whitish, yellow, orange or red, whith reddish brown markings (Bosch et al., 1995).
common size :
10-11 mm (Bosch et al., 1995). The Mediterranean specimen 9 mm long (Bogi and Galil, 1999).
Even juveniles of this species can be easily distinguished from all Parvicardium species not only by a much greater number of ribs but also by alternating strong and weak ribs. Close similarity with Parvicardium exiguum from which it differs mainly because it has about 35-40 radial ribs (20-22 in P. exiguum), ornamented by small and thick lamellae (tubercules in P. exiguum) and its anterior edge is more rostrated. Very similar also to P. trapezium from which it can be distinguished by its larger size (3.4 mm in P. trapezium), number of ribs (24-28 in P. trapezium) and sculpture.
BIOLOGY / ECOLOGY
Representatives of the family are known as actively mobile, suspension feeders (Todd, 2002).
sands, offshore; at Haifa port at 15 m.