Macrostomida, Ordo
Malacostraca, Classis
Malagazziidae, Familia
Margelopsidae, Familia
Margelopsis, Genus
Maxillopoda, Classis
Meganyctiphanes, Genus
Melicertidae, Familia
Melicertum, Genus
Mesogastropoda, Ordo
Mesopodopsis, Genus
Metaconchoecia, Genus
Meterythrops, Genus
Michtheimysis, Genus
Microstomidae, Familia
Mikroconchoecia, Genus
Mitrocomella, Genus
Mitrocomidae, Familia
Mitrocomoidea, Superfamilia
Modeeria, Genus
Mollusca, Phylum
Muggiaea, Genus
Munnopsidae, Familia
Munnopsis, Genus
Myodocopida, Ordo
Myodocopina, Subordo
Myopsida, Subordo
Mysidacea, Ordo
Mysidae, Familia
Mysideis, Genus
Mysidetes, Genus
Mysidopsis, Genus
Mysini, Subfamilia