C. abnormis, C. acutus, C. aequistriatus, C. amblyxiphias, C. angulatus, C. angustus, C. burlingtonensis, C. buttersi, C. chemungensis, C. clarkii, C. cliftonensis, C. compressus (syn. C. clarki), C. costatus, C. coxianus, C. crenatus, C. crenulatus, C. cylindricus, C. decussatus, C. denticulatus, C. depressus, C. elegans, C. excavatus, C. fallax, C. formosus, C. furcicarinatus, C. gemmatus, C. gracillimus, C. gradocostatus, C. gurleyi, C. keokuk, C. laevis, C. littoni, C. major (syn. C. tenuistriatus, C. varians, C. spectabilis, C. harrisoni, C. salopiensis, C. deflexus, C. maximus), C. marshii, C. mayi, C. minor, C. mutabilis, C. obscuracostatus, C. ornatus, C. pellensis, C. pugiunculus, C. pustulatus, C. randalli, C. sculptus, C. similis, C. speciosus, C. triangularis, C. venustus, C. vetustus, C. wrighti, C. xiphias

C. gondwanus