Haeckel, 1887
Shell thick-walled, ellipsoidal, surface covered with circular aspinal pits with kidney-shaped aspinal pores, edges of pits protruding, forming sheaths reaching 1/2 spicule length. Sheaths with longitudinal ribs ending in large spines at sheath margin. Sheath on secondary spicules less developed. Size of shell (excluding spicules): 0.16 by 0.14 mm; length of equatorial spicules: 0.15 mm, polar: 0.13 mm, secondary: 0.1 mm; length of sheaths on main spicules: 0.02-0.04 mm, on secondary: 0.01 mm.