Family: Unicellular or Colonial; cell body spherical, with one or more spiny projections; 
a single cup-shaped chloroplast with a pyrenoid; asexual reproduction by zoospore or autospore; 
sexual reproduction by fertilization between egg and sperm.
Genus: Colonial; cell body with 2 or more spiny hairs 
(Illustrations of The Japanese Fresh-water Algae, 1977). 
Species: