Species
• C. aquilonia Stehli and Grant, 1971 • C. arcuata Girty, 1910 • C. calendae Johnson 1971 • C. clannyana King 1848 • C. expansa Dunbar and Condra, 1932 • C. extumida Jin and Ye, 1979 • C. inflata Schnur, 1853 • C. longa Liao, 1980 • C. longirostris Cooper and Grant, 1976 • C. longtanica Jin and Hu, 1978 • C. muliensis Xu, 1978 • C. opalinus Termier and Termier, 1977 • C. parva Weller 1899 • C. planoconvexa Shumard, 1855 • C. sulcata Stehli, 1954 • C. tianshengqiaoensis Feng, 1978 • C. uralica Stepanov and Kalashnikov, 1998 • C. urei Fleming, 1828 • C. wampensis Mills and Langenheim Jr., 1987 == References ==