Family [Gonatozygaceae]: Cell body cylindrical, slightly swelled at both ends, loosely attached with each other to form a filament; cell wall consists of a single partition, two layers, with small pores, covered with dots, granules or short spines; chloroplast ribbon-like, with many aligned pyrenoids.
Genus: Two chloroplasts plate-like or slightly spiralled; a nucleus centrally located between the chloroplasts; mostly unicells, filaments rare (Illustrations of The Japanese Fresh-water Algae, 1977).

G. pilosum var. echinatum 2 clips 80 x 5.5 μm L/W= 14.5 Hiroshima, 1998

G. kinahani 2 clips 134 x 12 μm L/W= 11.2 Hiroshima, 1998

G. kinahani 2 clips 134 x 12 μm L/W= 11.2 Hiroshima, 1998