Public domain: Species accounts (122 / 1910)

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Species Synonym
Macrobrachium rosenbergii  
Macrocystis pyrifera  
Macromedaeus voeltzkowi  
Macrophthalmus (Macrophthalmus) indicus  
Macrorhynchia philippina  
Mactra lilacea  
Mactra olorina  
Maeotias marginata  
Magallana angulata Crassostrea angulata
Magallana gigas Crassostrea angulata (Lamarck, 1819)
Crassostrea gigas (Thunberg, 1793)
Gryphaea angulata (Lamarck, 1819)
Ostrea gigas (Thunberg, 1793)
Ostrea laperousii (Schrenk,1861)
Ostrea talienwhanensis (Crosse, 1862)
Magelona mirabilis  
Malleus regula Malvufundus regula (Forsskål in Niebuhr, 1775)
Mantoniella squamata  
Marenzelleria arctia  
Marenzelleria neglecta  
Marenzelleria viridis  
Marenzelleria wireni  
Maritigrella fuscopunctata  
Marivagia stellata  
Marphysa sanguinea Nereis sanguinea
Marphysa victori  
Marteilia refringens  
Martesia striata  
Mastocarpus stellatus  
Matuta victor  
Mawia benovici  
Medeiothamnion lyallii  
Mediomastus capensis  
Mediopyxis helysia  
Megabalanus coccopoma  
Megabalanus tintinnabulum  
Megabalanus tulipiformis  
Melanella orientalis  
Melanochlamys diomedea Aglaja diomedea (Bergh, 1894)
Aglaja nana Steinberg & M. L. Jones, 1960
Doridium diomedeum Bergh, 1894
Melanochlamys nana (Steinberg & M. L. Jones, 1960)
Melanothamnus harveyi Neosiphonia harveyi
Polysiphonia argentinica (Taylor WR, 1939)
Polysiphonia harveyi (Bailey JW, 1848)
Polysiphonia insidiosa (J.Agardh)(Crouan PL & Crouan HM, 186
Melanothamnus japonicus Neosiphonia japonica
Polysiphonia japonica
Melibe viridis  
Melita nitida  
Melithaea erythraea  
Membranipora membranacea Coffin Box Bryozoan
Menaethius monoceros  
Menippe mercenaria  
Mercenaria mercenaria Mercenaria cancellata (Gabb, 1860)
Mercenaria fulgurans (Tryon, 1865)
Mercenaria rutila (Sternheimer, 1957)
Mercenaria rutila rarilineata (Sternheimer, 1957)
Venus mercenaria (Linnaeus, 1758)
Mesanthura romulea  
Mesocalanus tenuicornis  
Metacalanus acutioperculum  
Metacarcinus novaezelandiae Cancer novaezelandiae
Metapenaeopsis aegyptia  
Metapenaeopsis mogiensis consobrina  
Metapenaeus monoceros  
Metapenaeus stebbingi  
Metasychis gotoi  
Metaxia bacillum  
Micippa thalia  
Microcirce consternans  
Microcosmus exasperatus  
Microcosmus squamiger  
Micromesistius poutassou  
Microphthalmus similis  
Micropogonias undulatus  
Microporella ciliata  
Microporella coronata  
Microporella harmeri  
Micropterus dolomieu  
Micropterus salmoides  
Miliolinella fichteliana  
Millerigobius macrocephalus Gobius macrocephalus Kolombatovic, 1891
Mimachlamys sanguinea  
Mitrella psilla Columbella japix (Duclos, 1848)
Columbella psilla (Duclos, 1846) (basionym)
Mizuhopecten yessoensis Patinopecten yessoensis
Mnemiopsis leidyi Mnemiopsis gardeni (Agassiz L, 1860)
Mnemiopsis mccradyi (Mayer, 1900)
Mnestia girardi  
Modiolus auriculatus  
Moerisia inkermanica  
Molgula manhattensis  
Molgula plana  
Molva sp.  
Monocorophium acherusicum Corophium acherusicum
Monocorophium insidiosum Corophium insidiosum
Monocorophium sextonae Corophium sextonae Crawford, 1937 (basionym)
Monocorophium uenoi  
Monodacna colorata  
Monophorus perversus  
Monopylephorus limosus  
Monosporus indicus  
Monotygma lauta  
Monotygma watsoni  
Monstrilla grandis  
Monstrilla helgolandica Monstrilla canadensis McMurrich, 1917
Monstrilla longicornis Monstrilla clavata Sars G.O., 1921
Morone saxatilis  
Morula aspera  
Muceddina multispinosa  
Mucropetraliella thenardii  
Mugil soiuy  
Mulinia lateralis  
Muraenesox cinereus Muraena arabicus Bloch & Schneider, 1801
Muraena cinerea Forsskål, 1775
Muraenesox arabicus (Bloch & Schneider, 1801)
Muraenesox cinerius (Forsskål, 1775)
Muraenosox cinereus (Forsskål, 1775)
Murchisonella mediterranea  
Murchisonella sp.  
Murex brandardis Bolinus brandardis
Murex forskoehlii  
Musculus coenobitus  
Mya arenaria Mya acuta (Say, 1822)
Mya acuta mercenaria (Say, 1822)
Mycale (Carmia) micracanthoxea  
Mycale (Carmia) senegalensis  
Mycale macginitei  
Mycteroperca fusca Serranus emarginatus (Valenciennes, 1843)
Serranus fuscus (Lowe, 1838)
Serranus simonyi (Steindachner, 1891)
Myicola ostreae  
Myra subgranulata  
Myriactula rivulariae  
Myrianida convoluta  
Myrionema strangulans  
Mytilaster lineatus  
Mytilaster minimus  
Mytilicola intestinalis  
Mytilicola orientalis  
Mytilopsis leucophaeata Mytilus conchleatus (Nyst, 1835) Congeria Conchleata (Wolff)
Mytilus leucophaetus (Conrad, 1831)
Mytilopsis sallei  
Mytilus edulis  
Mytilus galloprovincialis  
Mytilus trossulus  
Myxicola infundibulum