Family: Frontal cirri differ in size and/or pattern from ventral ones of files;
"collar" extends short distance along right edge of body; oral area not U-shaped
(Illustrated Guide, 1985).
Genus: Many species; usually ovoid or elongate in shape; AZM 1/4 of the body length; two rows of ventral cirri; frontal cirri present (Carey, 1992). Frontventral cirri in zig-zag files; rear rounded, body oval to long (Illustrated Guide, 1985).
Holosticha sp., strain A, protargol-stained by A. Kihara, x 400, x 640, May-June 1999 by Y. Tsukii
Holosticha sp., x 400, x 640, October 1999, Saitama Pref., stained by A. Kihara, photo by Y. Tsukii
H. diademata (Rees, 1884) Kahl, 1930-5: Elongate,
140 μm long;
a long AZM occupying 1/3 body length; 7 long & stout frontal cirri;
two ovoid macronuclei (Carey, 1992).
H. kessleri (Wrzesnioski, 1877) Kahl, 1930-5: Elongate, anterior rounded, but posterior truncated; 150 μm long; AZM 1/4 body length; two groups (?) of ovoid macronuclei (Carey, 1992).