Mosaic reef crab 
Mottled Crab 
Mottled Shore Crab 
Mudflat Fiddler Crab 
Munidopsis polymorpha 
Mushroom coral shrimp 
Natal river crab 
Naxia tumida 
Neomysis integer 
Neopetrolisthes maculatus 
Neostylodactylus litoralis 
Nimble spray crab 
Northern cleaner shrimp 
Northern lame crab 
Norway Lobster 
Nosy Pill Woodlouse 
Ocellated Tozeuma Shrimp 
ocypode brevicornis 
Oklahoma cave crayfish 
Olivar's Squat Lobster 
Orang-utan crab 
Orchestia gammarellus 
Oregonia gracilis 
Ornamental Spider Crab