|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Strophomenata - Strophomenida - Rafinesquinidae
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|L. E. Popov and L. R. M. Cocks 2014||Shell strongly concavoconvex, transverse and suboval in outline, with maximum width at or immediately anterior to the hinge line. Cardinal extremities slightly acute to almost rectangular. Anterior commissure rectimarginate, broadly rounded. Ventral valve gently and evenly concave, with an apsacline interarea and a triangular delthyrium completely covered by a convex pseudodeltidium. Lateral profile of dorsal valve strongly convex with maximum height slightly posterior to mid-length and flattened posterior slope. Dorsal interarea low, planar, apsacline; chilidial plates obscure. Radial ornament finely and almost evenly multicostellate with 4–6 ribs per 2 mm along the posterior margin of mature specimens, with irregular oblique rugellae along the dorsal posterior margin. Ventral interior with small teeth supported by low and divergent dental plates continuing as evenly rounded muscle-bounding ridges almost completely enclosing the ventral muscle field, with a narrow gap in the middle. Adductor scars lenticular, bisected throughout their entire length by a narrow median ridge which completely separates the diductor scars. Mantle canal impressions very poorly impressed, apart from the slightly divergent proximal parts of the vascula media. Prominent subperipheral rim near the lateral and anterior valve margins. Dorsal interior with delicate bilobed cardinal process, and straight, widely divergent socket plates. A pair of prominent side septa extends to the mid-valve, but median and outer side septa are absent.|