Macromysis inermis – synonym of Praunus inermis
Macromysis neglecta – synonym of Praunus neglectus
Macromysis nigra – synonym of Praunus neglectus
Macropsis slabberi – synonym of Mesopodopsis slabberi
Many other synonyms also. – synonym of Phialella quadrata
Many other synonyms, see Van der Spoel et al., 1997. – synonym of Janthina janthina
Many other synonyms. – synonym of Clytia hemisphaerica
Margelis nordgaardi – synonym of Bougainvillia muscoides
Margelis pricipis – synonym of Bougainvillia principis
Margelis zygonema – synonym of Bougainvillia britannica
Medusa aequorea – synonym of Aequorea forskalea
Medusa hemispaerica – synonym of Clytia hemisphaerica
Medusa pileata – synonym of Neoturris pileata
Medusa proboscidea – synonym of Sarsia tubulosa
Megalocranchia megalopsÊ – synonym of Teuthowenia megalops
Meganyctiphanes calmani – synonym of Meganyctiphanes norvegica
Meiosquilla desmaresti – synonym of Rissoides desmaresti
Melicerum campanula – synonym of Melicertum octocostatum
Mesomysis helleri – synonym of Paramysis helleri
Metoecus medusarum – synonym of Hyperoche medusarum
Mitrocoma cruciata – synonym of Mitrocomella polydiademata
Mitrocomella fulva – synonym of Mitrocomella polydiademata
Mitrocomella polydiadema – synonym of Mitrocomella polydiademata
More synonyms and references in Monod, 1926 – synonym of Gnathia maxillaris
More synonyms and references in Monod, 1926 – synonym of Gnathia oxyuraea
More synonyms and references in Monod, 1926 – synonym of Gnathia vorax
More synonyms and references in Monod, 1926 – synonym of Paragnathia formica
More synonyms and references in Tattersall and Tattersall, 1951, p. 378. – synonym of Praunus flexuosus
More synonyms in Bigelow, 1911 – synonym of Apolemia uvaria
More synonymy in Sars, 1900 – synonym of Iphinoe trispinosa
Moschites cirrosaÊ – synonym of Eledone cirrhosa
Muggiaea spiralis – synonym of Eudoxoides spiralis
Murex adversus – synonym of Cheirodonta pallescens
Mysideis (?) farrani – synonym of Mysidetes farrani
Mysidopsis hibernica – synonym of Mysideis insignis
Mysidopsis hispida – synonym of Leptomysis gracilis
Mysis arctica – synonym of Boreomysis arctica
Mysis arenosa – synonym of Paramysis arenosa
Mysis chamoeleon – synonym of Praunus flexuosus
Mysis cornuta – synonym of Praunus inermis
Mysis erythrophtalma – synonym of Erythrops erythrophthalma
Mysis flexuosa – synonym of Praunus flexuosus
Mysis gracilis – synonym of Leptomysis gracilis
Mysis griffithsiae – synonym of Siriella armata
Mysis helleri – synonym of Paramysis helleri
Mysis inermis – synonym of Praunus inermis
Mysis kervillei – synonym of Schistomysis kervillei
Mysis lamornae – synonym of Hemimysis lamornae
Mysis leachii – synonym of Praunus flexuosus
Mysis lingvura – synonym of Leptomysis lingvura
Mysis longicornis – synonym of Acanthomysis longicornis
Mysis mixta – synonym of Michtheimysis mixta
Mysis neglecta – synonym of Praunus neglectus
Mysis ornata – synonym of Schistomysis ornata
Mysis productus – synonym of Siriella armata
Mysis rostrata – synonym of Siriella armata
Mysis sancta – synonym of Gastrosaccus sanctus
Mysis scoticus – synonym of Neomysis integer
Mysis serraticauda – synonym of Mysidopsis angusta
Mysis slabberi – synonym of Mesopodopsis slabberi
Mysis spinifera – synonym of Gastrosaccus spinifer
Mysis spinulosus – synonym of Praunus flexuosus
Mysis spiritus – synonym of Schistomysis spiritus
Mysis truncatula – synonym of Praunus inermis
Mysis vulgaris – synonym of Neomysis integer