Vasticardium papuanum was named by Vidal (1996) [Shell medium to large-sized, ovoid and symmetrical to asymmetncal and posteriorly expanded, obliquely or not, "winged" or truncated Variably but moderately elongated and inflated Mean rib number small to medium, range 30-42, exceptionally 45 Hinge line moderately angled Cardinal teeth in right valve separated or merely touching at their base and never connected by a high and narrow dorsal saddle In juvenile median and anterior parts, ribs becoming quickly high, square sided and fully ornamented, directly following millimetric smooth very primitive shell In PQ, ribs always high and square-sided in juvenile shells, always simple, not divided into two parts, top scales or nodules always arranged in a single row along the apex In other quarters of adult shells, ribs generally high, often squared and overhanging interstices, rarely triangular, often beaning scales or tubercles in MPQ with crenulated margins, cross-bars in antenor half Interstices rather deep and wide, with a flat bottom, smooth or finely stnated independently from flanks of ribs, never notched or hollowed.]. It is extant.