• Caphyra minabensis Minabe-tosaka-gazami
  
• Caphyra rotundifrons Turtle-weed crab
  Maru-tosaka-gazami
  
• Caphyra yookadai Tosaka-gazami
  
• Carcinoplax eburnea Ogasawara-énkougani
  
• Carcinoplax longimanus Enkougani
  
• Carcinoplax longipes Kebuka-énkougani-modoki
  
• Carcinoplax longispinosa Chen-énkougani
  
• Carcinoplax meridionalis Rathbun-énkougani
  
• Carcinoplax microphthalmus Richer-énkougani
  
• Carcinoplax purpurea Murasaki-énkougani
  
• Carcinoplax surugensis Hime-énkougani
  
• Carcinoplax tomentosa Ohkebuka-énkougani
  
• Carcinoplax vestita Kebuka-énkougani
  
• Cardisoma carnifex Minami-ósagani
  
• Caridion gordoni
• Caridion steveni
• Carinaria lamarckii
• Carpilius convexus Yumongani
  
• Carpilius maculatus Seven-eleven crab
  Akamongani
  
• Carupa ohashii Ohhashi-carupa-gazami
  
• Carupa tenuipes Carupa-gazami
  
• Catablema vesicarium
• Cateios frontalis Portmolle-ébaria
  
• Catoptrus nitidus Haigazami
  
• Ceratocarcinus longimanus Tenaga-komachigani
  
• Ceratocarcinus trilobatus Mitsuha-komachigani
  
• Ceratoplax ciliata Tesch-kushiha-gani
  
• Ceratoplax sagamiensis Kushiha-gani
  
• Ceratoplax truncatifrons Philippines-kushiha-gani
  
• Cerianthus lloydii
• Chaceon granulatus Oh-énkougani
  
• Chaceon manningi Manning-énkougani
  
• Chalaroachaeus curvipes Kubinashi-ákeus
  
• Charybdis acuta Beni-íshigani
  
• Charybdis acutifrons Togari-madara-íshigani
  
• Charybdis affinis Leene-íshigani
  
• Charybdis amboinensis Amboina-íshigani
  
• Charybdis anisodon Anbon-íshigani
  
• Charybdis annulata Shima-áka-íshigani
  
• Charybdis bimaculata Futahoshi-íshigani
  
• Charybdis callianassa Bishin-íshigani
  
• Charybdis erythrodactyla Rainbow swimming crab
  Madara-íshigani
  
• Charybdis feriatus Shima-íshigani
  
• Charybdis granulata Tsubu-watari-íshigani
  
• Charybdis hellerii Indo-Pacific swimming crab
  Newcaledonia-íshigani
  
• Charybdis hongkongensis
• Charybdis japonica Ishigani
  
• Charybdis lucifera Montsuki-íshigani
  
• Charybdis miles Aka-íshigani
  
• Charybdis natator Watari-íshigani