|L. E. Popov and L. R. M. Cocks 2014|| Shell gently concavoconvex, about two thirds as long as wide. Radial ornament parvicostellate with 5–7 parvicostellae between accentuated ribs and 12–14 parvicostellae per mm. Ventral interior with a small, bilobed strongly impressed muscle field and well-defined subperipheral rim, accentuated by a row of radially arranged pustules. Dorsal interior with high, subtriangular median septum. Lophophore platform bounded by a high diaphragm almost orthogonal to the valve surface. Subperipheral rim strong, ridge-like, at about half the distance between the platform and the shell margin.
Shell gently concavoconvex to almost planoconvex, transverse and semioval in outline, about twothirds as long as wide, with maximum width at hinge line. Cardinal extremities slightly acute to almost rectangular. Anterior commissure rectimarginate. Ventral valve evenly convex with low apsacline interarea and a narrow delthyrium completely covered by a convex pseudodeltidium. Dorsal valve weakly concave to almost flat, with an anacline, linear interarea and discrete chilidial plates. Radial ornament weakly parvicostellate, with 5–7 parvicostellae between accentuated ribs and 12–14 parvicostellae per mm at the anterior margin of mature specimens. Ventral interior with small teeth lacking dental plates. Small, bilobed, ventral muscle field strongly impressed, bisected by prominent median ridge. Adductor scars small, located in the umbonal area and completely enclosed by the diductors. Two prominent swellings in front of the hinge line at about halfway between the umbo and cardinal extremities. Ventral subperipheral rim well defined, accentuated by a row of small radially arranged pustules. Ventral mantle canals saccate with long, divergent vascula media . Dorsal interior with trifid, undercut cardinal process and short, slightly curved socket ridges almost parallel to the hinge line. Median septum strong, high, subtriangular. Lophophore platform semicircular in outline, between two-thirds and three-quarters as long as wide and about 70% as long as the valve, bounded by a high diaphragm almost orthogonal to the almost orthogonal to the valve surface. Posterolateral terminations of diaphragm merge with thick swellings situated approximately opposite to those in the ventral valve. Strong, ridge-like subperipheral rim at about half the distance between the platform and the shell margin.