Lumpy Claw Crab 
Lupocyclus philippinensis 
Lysmatella Shrimp 
Madagascan Land Crab 
Madagascar Blue Crayfish 
Madagascar Freshwater Crayfish 
Magnificent Anemone Shrimp 
Maja squinado 
Mangrove root crab 
Mangrove tree crab 
Manipontonia psamathe 
Marbled rock crab 
McLane’s Cave Crayfish 
Mediterranean Slipper Lobster 
Miami cave crayfish 
Moon crab 
Mosaic reef crab 
Mottled Crab 
Mottled Shore Crab 
Mudflat Fiddler Crab 
Munidopsis polymorpha 
Mushroom coral shrimp 
Natal river crab 
Naxia tumida