There are approximately 3 species and subspecies in this genus: H. altiformis · H. multicamerata · H. rotundimargo
There are approximately 352 species and subspecies in this genus. Here are just 100 of them: C. actinocyclus · C. adumbaratus · C. aeginensis · C. alboranii · C. alpha · C. angstii · C. anomalus · C. antarcticus · C. antimomos · C. antiquus · C. apiculatus var. ambiguus · C. apollinis · C. arafuraensis · C. aralensis · C. argus · C. asteroides · C. asteromphallus · C. asteromphalus · C. asteromphalus asteromphalu · C. asteromphalus var. hybrida · C. asymmetricus · C. atlanticus · C. australiensis · C. australis · C. barkleyi · C. belgicae · C. bellum · C. bengalensis · C. beta · C. biangulatus · C. biconfusus · C. bifrons · C. binoculus · C. bipartitus · C. biradiatus · C. bisculatus · C. bisinuatus · C. bouvet · C. brockmanni · C. bullatus · C. bulliens · C. capensis · C. castracanei · C. caudatus · C. centralis · C. centranthus · C. centrolineatus · C. chromoradiatus · C. chunii · C. cinctus · C. circumdatus · C. circumscriptus · C. commutatus · C. compressus · C. comptus · C. concavus · C. concinniformis · C. concinnoides · C. concinnus · C. confertus · C. confusus · C. contendens · C. convergens · C. convexus · C. coscinnus · C. craspedodiscus · C. crassus · C. cristatus · C. cuneistriatus · C. curvatalus · C. curvatulus · C. curvulatus · C. cycloteres · C. debilis · C. decipiens · C. decrescens · C. delta · C. demergitus · C. denarius · C. denticulatus · C. devius · C. difficilis · C. dissoniformis · C. dissonus · C. distinctus · C. divisus · C. dubiosus · C. ebulliens · C. eccentric · C. eccentricus var. decipiens · C. eccetric · C. egregius · C. elegans · C. elegantulus · C. ellipticus · C. elliptipora · C. elongatus · C. endoi · C. entoleion · C. eta
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