Species
The following species within this genus have been described: • C. advena (Grant, 1976) • C. affinis Girty, 1909 • C. apheles Cooper and Grant, 1976 • C. apsidata Cooper and Grant, 1976 • C. bamberi Shi and Waterhouse, 1996 • C. biforma Yang, 1991 • C. bucculenta Cooper and Grant, 1976 • C. costata Cooper and Grant, 1976 • C. cracens Cooper and Grant, 1976 • C. crassa Cooper and Grant, 1976 • C. depressa Sun, 1991 • C. discina Cooper and Grant, 1976 • C. elongata Dunbar and Condra, 1932 • C. emarginata (Girty, 1909) • C. enormis Cooper and Grant, 1976 • C. girtyi Raymond, 1911 • C. grandis Cooper, 1953 • C. hapsida Stehli and Grant, 1970 • C. huagongensis Liao, 1979 • C. idahoensis Butts, 2007 • C. imbricata Cooper and Grant, 1976 • C. indosinensis (Mansuy, 1914) • C. insulcata Zeng et al., 1995 • C. jogensis Yanagida & Nishikawa, 1984 • C. magnicarina Campbell, 1961 • C. mexicana (Hall, 1857) • C. minuscula Chronic, 1949 • C. mira (Girty, 1899) • C. misriensis (Reed, 1944) • C. nucella Cooper and Grant, 1976 • C. ovata (Mather, 1915) • C. parasulcata Cooper and Grant, 1976 • C. pilula Cooper and Grant, 1976 • C. plana Yancey, 1978 • C. prospera Cooper and Grant, 1976 • C. pyriformis Cooper and Grant, 1976 • C. quadrirotunda (Lee and Su, 1980) • C. quantilla Cooper and Grant, 1976 • C. rotunda Snider, 1915 • C. sigma Gordon, 1975 • C. stalagmium Cooper and Grant, 1976 • C. strongyle Cooper and Grant, 1976 • C. subcircularis Brill, 1940 • C. subquadrata (Hall, 1858) • C. subtilita (Hall, 1852) • C. tareica Chernyak, 1963 • C. tetralobata Hoare, 1960 • C. tobaensis Wang, 1985 • C. trinuclea (Hall, 1956) == References ==