Genus: cell body flat, constricted at the center; semicell ellipsoidal or subtriangular, central area of the apex slightly elevated,
cells connected with each other at their central area of apex forming filament.
Spondylosium sp. similar to S. pulchellum W. Archer (or Cosmarium ?),
cell body 14 μm long, 11 μm wide,
x 640, Kayoicho-ike (pond), Kasuya town, Fukuoka Pref., Japan, October 2001 by Y. Tsukii
94 μm; x 640