Two-segmented, very characteristic shell. Cephalis very small, spherical, hyaline. Thorax conical proximally, flaring rapidly outward distally and, in complete specimens, ending in a gently curved brim. Diameter of fully-grown shells: up to 1 mm.
Ref.: Benson (1966), Petrushevskaya (1971a).
Kingdom Protoctista Phylum Actinopoda Subphylum Sarcodina Class Polycystina Order Nassellaria Family Theoperidae Genus Litharachnium Species Litharachnium tentorium