Genus Sphaerastrum Greeff, 1875, emend. Mikrjukov, 1996

Diagnosis: Centrohelid heliozoa with the cell body covered by a mucous coat and a thick jacket of mainly tangential organic spicules. Siliceous elements in the cell envelope are absent.
One species: S. fockii (Archer, 1869), emend. Mikrjukov, 1996

Recent posts

Difflugia acuminate tests

Acuminate tests Tests with one or more spines or bud-like or conical protuberances or just a pointed fundus D. acuminata D. congolensis D. ventricosa D.

Read More »

Difflugia subaequalis

Difflugia subaequalis, from Penard, 1910 Difflugia subaequalis  Penard, 1910 Diagnosis: Test almost spherical, slightly elongated, with a wide pseudostome, almost as wide as the test

Read More »

Difflugia spherical tests

 Difflugia ampullula, after Playfair, 1918  Difflugia ampullula  Playfair, 1918 Diagnosis: Test broadly ovate, with hemispherical fundus, and sides gradually converging in almost straight lines to

Read More »

Difflugia stepaneki

Difflugia stepaneki, from Hager and Haagerova, 1970 Difflugia stepaneki  Hager and Haagerova, 1970 Diagnosis: Test broad elliptical, circular in cross-section, with a short neck that

Read More »