Operculum thin and horny, with numerous spiral lines.
There are approximately 175 species and subspecies in this genus. Here are just 100 of them: C. africatena · C. albanyensis · C. albinus · C. aloysi · C. aloysii · C. anus · C. araonis · C. ater · C. atricatena · C. atricatenata · C. atropurpurcus · C. atropurpureus · C. baccatus · C. bathyraphe · C. beaui · C. bertheloti · C. bertheloti dOrb · C. berthelotii · C. berthelotti · C. bicarinatus · C. bicrenatus · C. blandus · C. bronni · C. brunneus · C. callicoccus · C. capensis · C. cariniferus · C. ceylanicus · C. clanculoides · C. C. · C. clanguloides · C. clangulus · C. clanzulus · C. clippertonensis · C. comarilis · C. concamerata · C. concavus · C. consobrinus · C. consorbinus · C. consorbrinus · C. coralbinus · C. corallinus · C. couturii · C. crassilabrum · C. cruciatus · C. curciatus (Yellow Garden Eel) · C. debilis · C. dentaculatus · C. denticulata · C. denticulatus · C. dunkeri · C. eruciatus · C. erythraeus · C. eucarinatus · C. euchelioides · C. euchiloides · C. exacua · C. exquisita · C. flagellatus · C. flavidus · C. floridus · C. flosculus · C. fratercululs (Cape Hagfish) · C. gatliffi · C. gemmatus · C. gemmulifer · C. gemmulifer pallidus · C. gemmuliferus · C. gemmuliferus pallidus · C. gennesi · C. godeffroyi · C. granifer · C. granosus · C. granti · C. granulata · C. guincensis · C. guineensis · C. guinensis · C. guiniensis · C. hizenensis · C. hizenensis fraterculus · C. hizensis (Balsas Catfish) · C. jessieni · C. jissieni · C. johnstoni · C. jucundus · C. jussieni · C. jussieui · C. kochii · C. korkosi · C. kraussi · C. largillierti · C. leucomphalus · C. limbatus · C. mangeri · C. margaritaceus · C. margaritarius · C. margaritarius margaritarius · C. margaritarius multiplicatus · C. margaritius (Red Squirrel)
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