Family: Frontoventral cirri scattered on forward, mid- and rear areas of ventrum.
Genus: Oral cavity not wide; 2 oval macronuclei; marginal cirri confluent at rear; frontventral cirri not linear; body firm, not laterally flexible (Illustrated Guide, 1985). a large AZM at least 1/2 body length; caudal & transverse cirri present; two ovoid macronuclei (Carey, 1992).
Histriculus sp., well-fed cells, x 400, by Y. Tsukii
Histriculus sp., "dog eats dog", x 200 & x 400, by Y. Tsukii
50 μm 100 μm 150 μm; x 400
Histriculus sp., double-stained with azure C and fastgreen, x 400, by Y. Tsukii
Histriculus sp., a cyst, x 400, by Y. Tsukii