• Michtheimysis mixta
• Micippa cristata Ohwatakuzu-gani
  
• Micippa margaritifera Mawata-kuzugani
  
• Micippa parca Alcock-watakuzu-gani
  
• Micippa philyra Ko-watakuzu-gani
  
• Micippa platipes Hira-watakuzu-gani
  
• Micippa thalia Watakuzu-gani
  
• Micippoides angustifrons Kebuka-togari-gani
  
• Mictyris brevidactylus Minami-kometsuki-gani
  
• Miersiella cavifrons Amami-shin-ohgigani
  
• Miersiella haswelli Haswell-shin-ohgigani
  
• Mikroconchoecia curta
• Mikroconchoecia echinulata
• Mitrocomella brownei
• Mitrocomella polydiademata
• Modeeria rotunda
• Moloha acutispina Tunonaga-ohhomora
  
• Moloha majora Ibote-ohhomora
  
• Mortensenella forceps Thai-àriake-modoki
  
• Muggiaea atlantica
• Munnopsis typica
• Mursia armata Kinsen-modoki
  
• Mursia australiensis Gohsyu-kinsen-modoki
  
• Mursia cf aspera Oh-kinsen-modoki
  
• Mursia danigoi Galil-kinsen-modoki
  
• Mursia microspina Minami-kinsen-modoki
  
• Mursia trispinosa Mitsuha-kinsen-modoki
  
• Myomenippe hardwicki Stone crab
  Grey-hizumegani
  
• Myra affinis Tenaga-kobushi-modoki
  
• Myra celeris Tenaga-kobushi
  
• Mysideis insignis
• Mysidetes farrani
• Mysidopsis angusta
• Mysidopsis didelphys
• Mysidopsis gibbosa
• Nanhaipotamon globosum Okinawa-yamagani
  
• Nannastacus unguiculatus
• Nanocassiope alcocki Sagami-himeohgigani
  
• Nanomia cara
• Nanopilumnus coralliophilus Chibi-kebukagani
  
• Nanopilumnus hondai Honda-kebukagani
  
• Nanopilumnus rouxi Roux-kebukagani
  
• Nanosesarma gordoni Hime-benkeigani
  
• Nanosesarma minutum Jakarta-hime-benkeigani
  
• Natatolana borealis
• Nausithoe atlantica
• Naxioides hirta Ibo-éda-tsunogani
  
• Naxioides robillardi Eda-tsunogani
  
• Naxioides taurus Koéda-tsunogani
  
• Nectopyramis diomedeae