5. With frontal cirri 6
No frontal cirri; 2 to 3 rows of Genus _Holosticha_
ventral cirri; anal cirri small
6. Right margin of peristome straight Genus _Oxytricha_
as far as the anterior end; 5 rows
ventral cirri; 5 anal cirri
Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 · 第 70 / 84 题