Haeckel, 1887
Mantle of double cone compressed, thick walled, with elliptical transverse section; its contour straight; surface with six stronger and numerous smaller straight ribs and six marginal denticulate incisions. Central shell nearly spherical. Diameter of mouth one-third as long as whole shell and somewhat smaller than equatorial diameter. Larger equatorial spicules about twice as long as sheath, pyramidal, with emarginate point and six wings. Smaller equatorial spicules short and strong, pyramidal. Sixteen other spicules thin, straight, conical. Length of shell 0.3 mm; equatorial breadth 0.11 mm, polar breadth 0.1 mm.