Macrocoeloma nummifer – synonym of Entomonyx spinosus
Macrophthalmus (Euplax) bosci – synonym of Macrophthalmus boscii
Macrophthalmus (Macrophthalmus) brevis – synonym of Macrophthalmus brevis
Macrophthalmus (Macrophthalmus) cf. verreauxi – synonym of Macrophthalmus serenei
Macrophthalmus (Macrophthalmus) dilatatum – synonym of Macrophthalmus abbreviatus
Macrophthalmus (Macrophthalmus) dilatatus – synonym of Macrophthalmus abbreviatus
Macrophthalmus (Macrophthalmus) dilatatus dilatatus – synonym of Macrophthalmus abbreviatus
Macrophthalmus (Macrophthalmus) kempi – synonym of Macrophthalmus serenei
Macrophthalmus (Macrophthalmus) telescopicus – synonym of Macrophthalmus serenei
Macrophthalmus (Macrophthalmus) telescopicus – synonym of Macrophthalmus telescopicus
Macrophthalmus (Macrophthalmus) verreauxi – synonym of Macrophthalmus serenei
Macrophthalmus (Mareotis) holthuisi – synonym of Macrophthalmus boteltobagoe
Macrophthalmus (Mareotis) japonicus frequens – synonym of Macrophthalmus japonicus
Macrophthalmus (Mareotis) japonicus japonicus – synonym of Macrophthalmus banzai
Macrophthalmus (Mopsocarcinus) bosci – synonym of Macrophthalmus boscii
Macrophthalmus (Mopsocarcinus) franchettii – synonym of Macrophthalmus boscii
Macrophthalmus Bosci – synonym of Macrophthalmus boscii
Macrophthalmus carinimanus – synonym of Macrophthalmus brevis
Macrophthalmus compressipes – synonym of Macrophthalmus telescopicus
Macrophthalmus Desmaresti – synonym of Macrophthalmus latreillei
Macrophthalmus dilatatum – synonym of Macrophthalmus abbreviatus
Macrophthalmus dilatatus – synonym of Macrophthalmus abbreviatus
Macrophthalmus dilatatus carens – synonym of Macrophthalmus brevis
Macrophthalmus eratus – synonym of Macrophthalmus erato
Macrophthalmus Franchettii – synonym of Macrophthalmus boscii
Macrophthalmus granulosus – synonym of Macrophthalmus latreillei
Macrophthalmus inermis – synonym of Macrophthalmus convexus
Macrophthalmus japonicus "Form L" – synonym of Macrophthalmus banzai
Macrophthalmus laniger – synonym of Macrophthalmus latreillei
Macrophthalmus latreillii – synonym of Macrophthalmus latreillei
Macrophthalmus podophthalmus – synonym of Macrophthalmus telescopicus
Macrophthalmus Polleni – synonym of Macrophthalmus latreillei
Macrophthalmus serratus – synonym of Macrophthalmus latreillei
Macrophthalmus simdentatus – synonym of Macrophthalmus brevis
Macrophthalmus travancorensis – synonym of Macrophthalmus brevis
Macrophthalmus Verreauxi – synonym of Macrophthalmus serenei
Macrophthalmus verreauxi – synonym of Macrophthalmus telescopicus
Macropipus corrugatus – synonym of Liocarcinus corrugatus
Maia gibba – synonym of Maja gibba
Maia Miersii – synonym of Maja miersii
Maia spinigera – synonym of Maja spinigera
Maja (Chorinus) longispina – synonym of Thacanophrys longispinus
Maja (Dione) affinis – synonym of Schizophrys aspera
Maja (Huenia) elongata – synonym of Huenia heraldica
Maja (Huenia) heraldica – synonym of Huenia heraldica
Maja (Huenia) proteus – synonym of Huenia heraldica
Maja (Maja) spinigera – synonym of Maja spinigera
Maja (Mithrax) dichotoma – synonym of Schizophrys aspera
Maja (Nicippe) Thalia – synonym of Micippa thalia
Maja (Paramaja) spinigera – synonym of Maja spinigera
Maja (Paramithrax) Edwardsii – synonym of Leptomithrax edwardsi
Maja kaempferi – synonym of Macrocheira kaempferi
Maja miersi – synonym of Maja miersii
Maja nipponensis – synonym of Maja japonica
Majacea, Taka ashi gani – synonym of Macrocheira kaempferi
Majia miersii – synonym of Maja miersii
Maldivia galapagensis – synonym of Jonesius triunguiculatus
Maldivia gardineri – synonym of Jonesius triunguiculatus
Maldivia palmyrensis – synonym of Palmyria palmyrensis
Maldivia triunguiculata – synonym of Jonesius triunguiculatus
Matuta appendiculata – synonym of Matuta planipes
Matuta banksi – synonym of Ashtoret lunaris
Matuta banksi var. picta – synonym of Ashtoret picta
Matuta banksii – synonym of Ashtoret lunaris
Matuta crebrepunctata – synonym of Matuta victor
Matuta crebripunctata – synonym of Matuta victor
Matuta curtispina – synonym of Izanami curtispina
Matuta distinguenda – synonym of Ashtoret picta
Matuta flagra – synonym of Matuta planipes
Matuta laevidactyla – synonym of Matuta planipes
Matuta lessueri – synonym of Ashtoret lunaris
Matuta lesueri – synonym of Matuta victor
Matuta lesuerii – synonym of Matuta victor
Matuta lineifera – synonym of Matuta planipes
Matuta lunaris – synonym of Ashtoret lunaris
Matuta maculata – synonym of Ashtoret maculata
Matuta miersi – synonym of Ashtoret miersii
Matuta miersii – synonym of Ashtoret miersii
Matuta peronii – synonym of Matuta victor
Matuta picta – synonym of Ashtoret picta
Matuta rubrolineata – synonym of Matuta planipes
Matuta victor var. d – synonym of Matuta planipes
Matuta victrix – synonym of Matuta victor
Matuta victrix var. crebrepunctata – synonym of Matuta victor
Maxillothrix actaeiformis – synonym of Dynomene pilumnoides
Medaeus distinguendus – synonym of Macromedaeus distinguendus
Medaeus granulosus – synonym of Medaeops granulosus
Medaeus haswelli – synonym of Miersiella haswelli
Medaeus nodosus – synonym of Halimede fragifer
Medaeus nodulosus – synonym of Halimede fragifer
Medaeus noelensis – synonym of Paramedaeus noelensis
Medaeus planifrons – synonym of Paramedaeus planifrons
Medaeus rouxi – synonym of Nanopilumnus rouxi
Medaeus simplex – synonym of Paramedaeus simplex
Megaesthesius sp. – synonym of Megaesthesius yokoyai
Megametope sulcatus – synonym of Neoxanthops cavatus
Melia (= Lybia) tessellata – synonym of Lybia tessellata
Melia caesifer – synonym of Lybia caestifera
Melia caestifer – synonym of Lybia caestifera
Melia tesselata – synonym of Lybia tessellata
Melia tessellata – synonym of Lybia tessellata
Melissa mammillata – synonym of Euxanthus exsculptus
Melissa nitida – synonym of Euxanthus exsculptus
Menaethius angustus – synonym of Menaethius monoceros
Menaethius areolatus – synonym of Menaethius monoceros
Menaethius dentatus – synonym of Menaethius monoceros
Menaethius depressus – synonym of Menaethius monoceros
Menaethius inornatus – synonym of Menaethius monoceros
Menaethius monoceros var. angusta – synonym of Menaethius monoceros
Menaethius porcellus – synonym of Menaethius monoceros
Menaethius rugosus – synonym of Menaethius monoceros
Menaethius subserratus – synonym of Menaethius monoceros
Menaethius tuberculatus – synonym of Menaethius monoceros
Menippe (Myomenippe) granulosa – synonym of Myomenippe hardwicki
Menippe bellangeri – synonym of Menippe rumphii
Menippe convexa – synonym of Sphaerozius nitidus
Menippe ortmanni – synonym of Sphaerozius nitidus
Metagrapsus indicus – synonym of Neosarmatium indicum
Metagrapsus punctatus – synonym of Neosarmatium punctatum
Metaplax crassipes – synonym of Metaplax elegans
Metaplax takahasii – synonym of Metaplax takahashii
Metasesarma granularis – synonym of Metasesarma rousseauxi
Metasesarma Rousseauxii – synonym of Metasesarma rousseauxi
Metopograpsus eydouxi – synonym of Metopograpsus thukuhar
Metopograpsus maculatus – synonym of Metopograpsus latifrons
Metopograpsus messor var. thukuhar – synonym of Metopograpsus thukuhar
Metopograpsus pictus – synonym of Metopograpsus latifrons
Micippa aculeata – synonym of Micippa thalia
Micippa biarinata – synonym of Micippa platipes
Micippa bicarinata – synonym of Micippa platipes
Micippa haani – synonym of Micippa thalia
Micippa hirtipes – synonym of Micippa platipes
Micippa margaritifera var. parca – synonym of Micippa parca
Micippa mascarenica – synonym of Micippa philyra
Micippa mascarenica var. nodulifera – synonym of Micippa philyra
Micippa miliaris – synonym of Micippa thalia
Micippa philyra var. latifrons – synonym of Micippa platipes
Micippa philyra var. mascarenica – synonym of Micippa philyra
Micippa philyra var. platipes – synonym of Micippa platipes
Micippa pusilla – synonym of Micippa thalia
Micippa spatulifrons – synonym of Micippa platipes
Micippa superciliosa – synonym of Micippa philyra
Micippe cristata – synonym of Micippa cristata
Micippe margaritifera – synonym of Micippa margaritifera
Micippe margaritifera var. parca – synonym of Micippa parca
Micippe philyra – synonym of Micippa philyra
Micippe philyra var. mascarenica – synonym of Micippa philyra
Micippe phylira – synonym of Micippa philyra
Micippe platipes – synonym of Micippa platipes
Microcassiope orientalis – synonym of Macromedaeus orientalis
Micropanope alcocki – synonym of Nanocassiope alcocki
Micropanope granulipes – synonym of Nanocassiope alcocki
Micropanope obtusidens – synonym of Paraxanthodes obtusidens
Microphrys styx – synonym of Tylocarcinus styx
Microrhynchus (Inachus) tuberculatus – synonym of Pyromaia tuberculata
Mimulus cristatus – synonym of Sargassocarcinus sublimis
Mithrax (Schizophrys) affinis – synonym of Schizophrys aspera
Mithrax (Schizophrys) triangularis – synonym of Schizophrys aspera
Mithrax (Schizophrys) triangularis var. africanus – synonym of Schizophrys aspera
Mithrax (Schizophrys) triangularis var. asper – synonym of Schizophrys aspera
Mithrax (Schizophrys) triangularis var. indica – synonym of Schizophrys aspera
Mithrax asper – synonym of Schizophrys aspera
Mithrax spinifrons – synonym of Schizophrys aspera
Mithrax suborbicularis – synonym of Cyclax suborbicularis
Moloha alcocki – synonym of Moloha majora
Monomia argentata – synonym of Portunus argentatus
Monomia gladiator – synonym of Portunus haani
Mursia armata trispinosa – synonym of Mursia trispinosa
Mursia armata typica – synonym of Mursia armata
Mursia curtispina trispinosa – synonym of Mursia trispinosa
Myctiris brevidactylus – synonym of Mictyris brevidactylus
Myctiris longicarpus brevidactylus – synonym of Mictyris brevidactylus
Myomenippe duplicidens – synonym of Myomenippe hardwicki
Myomenippe hardwickii – synonym of Myomenippe hardwicki
Myra sp. – synonym of Myra celeris