Genus: Ovoid, firm; dorsal side convex, ventral side flattened; dorsal surface ridged;
adoral zone reduced or rudimentary; macronucleus U-shaped or in two rounded parts (Kudo, 1966).
Species: Ovoid, 50 μm long; dorsal surface with four ribs, the second from left of which carries a sharp backwardly curving thorn; 7 frontoventral, 5-6 transverse cirri; macronucleus horseshoe-shaped (Carey, 1992). |
Aspidisca sp. (aculeata ?), dorsal surface is ridged,
cell body 50 μm long,
x 200 & x 400, Japan, 1997 by Y. Tsukii
50 μm
100 μm
150 μm; x 400
