(1) Adult shells of both C. syringothyriformis and species of Regelia are large with alate cardinal extremities and large nearly catacline ventral interareas.(2) Medium-sized, alate , subequally biconvex shells with deflected anterior margins in later growth stages.(3) Ventral valve most strongly convex posteriorly, ventral deflection beginning at about 6 mm from beak, becoming slightly alate , but not preserved on anterior portion of valve.(4) Note that valve diameters do not include the alate longitudinal ridges.(5) Some possess wide u2018wings,u2019 or alate lamellae, while in other species the lamellae fold into delicate spines.
