Macomona deltoidalis (triangular tellin)

Macquariella kingensis (King Island winkle)

Macroschisma producta (elongated keyhole-limpet)

Macroschisma tasmaniae (Tasmanian keyhole-limpet)

Macteola anomala (anomalous false-turrid)

Mactra antecedens (oval trough-shell)

Mactra australis (southern trough-shell)

Mactra contraria (contrary trough-shell)

Mactra jacksonensis (Port Jackson trough-shell)

Mactra pura (white trough-shell)

Mactra pusilla (flea-like trough-shell)

Mactra rufescens (reddish trough-shell)

Madrella sanguinea (blood-red sea-slug)

Malluvium devotus (devoted bonnet-limpet)

Maoricolpus roseus (New Zealand screw-shell)

Maoricrypta immersa (common slipper-limpet)

Marikellia solida (solid lepton)

Marinula parva (small air-breather)

Marinula xanthostoma (delicate air-breather)

Marioniopsis platyctenea (flat-combed sea-slug)

Marita bella (pretty false-turrid)

Marita compta (margin-like false-turrid)

Marita fallaciosa (deceptive false-turrid)

Marita schoutenensis (Schouten false-turrid)

Melanella cunaeformis (nest-shaped urchin-snail)

Melanella inflata (swollen seastar-snail)

Melanella legrandi (Legrand’s urchin-snail)

Melanella mamilla (nipple urchin-snail)

Melanella mayi (May’s urchin-snail)

Melanella orthopleura (orthopleura urchin-snail)

Melanella schoutanica (Schouten Island urchin-snail)

Melanella tenisoni (Tenison’s urchin-snail)

Melanella tryoni (Tryon’s urchin-snail)

Melanochlamys hendrecki (Hendreck’s sea-slug)

Melanochlamys queritor (indignant sea-slug)

Melibe australis (austral sea-slug)

Melibe maugeana (Maugean sea-slug)

Melliteryx acupuncta (pierced lepton)

Merelina cancellata (latticed rice-shell)

Merelina cheilostoma (lipped rice-shell)

Merelina hirta (hairy rice-shell)

Merisca margaritina (pearly tellin)

Mesoginella altilabra (high-lipped margin-shell)

Mesoginella caducocincta (fading-girdle margin-shell)

Mesoginella consobrina (cousin margin-shell)

Mesoginella gabrieli (Gabriel’s margin-shell)

Mesoginella inconspicua (inconspicuous margin-shell)

Mesoginella olivella (olive margin-shell)

Mesoginella pygmaeoides (pygmy margin-shell)

Mesoginella schoutanica (Schouten Island margin-shell)

Mesoginella strangei (Strange’s margin-shell)

Mesoginella translucida (translucent margin-shell)

Mesoginella turbinata (top-shaped margin-shell)

Mesoginella victoriae (Victorian margin-shell)

Mesonychoteuthis hamiltoni (colossal squid)

Mesopeplum anguineum (serpent scallop)

Mesopeplum fenestratum (windowed scallop)

Metaxia protolineata (protolined dextral-creeper)

Microcolus dunkeri (Dunker’s tulip-shell)

Microdiscula charopa (bluish orbitestellid)

Microdryas iravadioides (irawaddy-like false rice-shell)

Microdryas janjucensis (Jan Juc false rice-shell)

Microgenia edwini (Edwin’s false-turrid)

Micromytilus crenatuliferus (scalloped micromussel)

Microvoluta australis (southern volute-mitre)

Midorigai australis (common sea-slug)

Mimachlamys asperrima (doughboy scallop)

Miralda suprasculpta (etched pyramid-shell)

Mitra badia (dark brown mitre)

Mitra glabra (smooth mitre)

Mitrella austrina (southern dove-shell)

Mitrella axiaerata (axiaerate dove-shell)

Mitrella irrorata (bathed dove-shell)

Mitrella leucostoma (white-mouthed dove-shell)

Mitrella lincolnensis (Port Lincoln dove-shell)

Mitrella menkeana (pointed dove-shell)

Mitrella semiconvexa (semiconvex dove-shell)

Mitrella tayloriana (Taylor’s dove-shell)

Mitrella tenuis (white-based dove-shell)

Mitromorpha alba (white false-turrid)

Mitromorpha angusta (narrow false-turrid)

Mitromorpha bassiana (Bassian false-turrid)

Mitromorpha columnaria (columnar false-turrid)

Mitromorpha costifera (ribbed false-turrid)

Mitromorpha macphersonae (Macpherson’s false-turrid)

Mitromorpha multicostata (many-ribbed false-turrid)

Modiolus albicostatus (white-sided horse-mussel)

Modiolus areolatus (bearded horse-mussel)

Monophorus angasi (Angas’ sinistral-creeper)

Monophorus nigrofuscus (blackish sinistral-creeper)

Montfortula rugosa (rough notch-limpet)

Moroteuthis ingens (enormous squid)

Moroteuthis robsoni (Robson’s squid)

Mucrosquama verconis (Verco’s chiton)

Munditia hedleyi (Hedley’s liotia)

Munditia mayana (May’s liotia)

Munditia subquadrata (squared liotia)

Munditia tasmanica (Tasmanian liotia)

Muricopsis umbilicatus (umbilicated murex)

Musculista senhousia (Asian bag-mussel)

Musculus alganus (seaweed mussel)

Musculus impactus (nesting mussel)

Musculus nanus (Pauluccia’s mussel)

Myadora albida (whitened myadora)

Myadora brevis (short myadora)

Myadora complexa (complex myadora)

Myadora elongata (elongate myadora)

Myadora pandoriformis (pandora-like myadora)

Myadora pervalida (pervalid myadora)

Myadora rotundata (Tasmanian myadora)

Myllita auriculata (eared myllita)

Myllita deshayesi (Deshayes’ myllita)

Myllita tasmanica (Tasmanian myllita)

Myochama anomioides (saddle myochama)

Myochama tasmanica (Tasmanian myochama)

Myrtea botanica (Botany Bay lucine)

Myrtea mayi (May’s lucine)

Mysella angasiana (Angas’ lepton)

Mysella anomala (unusual lepton)

Mysella donaciformis (wedge-shaped lepton)

Mysella dromanaensis (Dromana lepton)

Mysella lactea (milky lepton)

Mysella ovata (ovate lepton)

Mysticoncha wilsoni (Wilson’s ear-cowrie)

Mytilus galloprovincialis planulatus (blue mussel)