• Corymorpha nutans
• Coryne eximia
• Coryne producta
• Coryne prolifera
• Cosmetira pilosella
• Cosmonotus genkaiae Genkai-kosumogani
  
• Cosmonotus grayii Kosumogani
  
• Crangon allmanni
• Crangon crangon
• Criocarcinus superciliosus Kudame-tsunogani
  
• Crossotonotus taketomiensis Hime-àshibuto-ítoashigani
  
• Cryptocheles pygmaea
• Cryptochirus coralliodytes Kebuka-sango-yadori-gani
  
• Cryptochirus planus Wakayama-kebuka-sango-yadori-gani
  
• Cryptocnemus kamekii Kameki-úsuheri-kobushi
  
• Cryptocnemus obolus Usuheri-kobushi
  
• Cryptocnemus pentagonus Gokaku-úsuheri-kobushi
  
• Cryptodromia coronata Korona-kaikamuri
  
• Cryptodromia fallax Mizo-kaikamuri
  
• Cryptodromia fukuii Fukui-kamuri
  
• Cryptodromia mariae Newguinea-kamuri
  
• Cryptodromia nipponensis Nihon-kaikamuri
  
• Cryptodromia stearnsi Ives-kaikamuri
  
• Cryptodromia tuberculata Ibo-kaikamuri
  
• Cryptodromia tumida bispinosa Futaha-íso-kaikamuri
  
• Cryptodromia tumida trispinosa Mitsuha-íso-kaikamuri
  
• Cryptodromia tumida tumida Iso-kaikamuri
  
• Cryptodromiopsis bullifera Tsuno-kaikamuri
  
• Cryptodromiopsis unidentata Kinuge-kamuri
  
• Cryptopodia fornicata Marumi-kawari-hishigani
  
• Cumella pygmaea
• Cumopsis goodsiri
• Cyanea capillata
• Cyanea lamarckii
• Cyclaspis longicaudata
• Cyclax spinicinctus Toge-nokogiri-gani
  
• Cyclax suborbicularis Marumi-nokogiri-gani
  
• Cyclocanna welshi
• Cyclocoeloma tuberculata Mimizuku-gani
  
• Cycloes granulosa Calappa-modoki
  
• Cyclograpsus integer Minami-ákaiso-gani
  
• Cyclograpsus intermedius Akaisogani
  
• Cyclograpsus longipes Ashinaga-ákaiso-gani
  
• Cycloxanthops truncatus Togari-ohgigani
  
• Cymo andreossyi Hime-saimon-gani
  
• Cymo melanodactylus Saimon-gani
  
• Cymo quadrilobatus Awahada-saimon-gani
  
• Cymo sp Saimon-gani sp.
  
• Cymonomus andamanicus Indo-tunodashi-heike
  
• Cymonomus curvirostris Tsunonashi-mameheike