Family:
Genus: Greater part of axopodia and cell body covered by a thick gelatinous mantle (Kudo, 1966).

Sphaerastrum sp. 10 clips USA, 1998

Sphaerastrum sp. 3 clips USA, 1998

Sphaerastrum sp. 16 clips Torinome-Kasen p. Nasu-shiobara Tochigi, 1998