Abra (semele-clams)
Abraliopsis (squid)
Abranda (tellins)
Acanthochitona (chitons)
Acanthodoris (sea-slugs)
Acesta (file-shells)
Aclophoropsis (sinistral-creepers)
Acremodontina (false top-shells)
Acrosterigma (cockles)
Acteon (acteons)
Adamnestia (peanut-shells)
Adelphotectonica (sundial-shells)
Aegires (sea-slugs)
Aeolidiella (sea-slugs)
Aesopus (dove-shells)
Afrolittorina (australwinks)
Agnewia (rock-shells)
Alaba (alabas)
Alaginella (margin-shells)
Alcyna (kelp-shells)
Alloiodoris (sea-lemons)
Alvania (rice-shells)
Amalda (olive-shells)
Amblychilepas (keyhole-limpets)
Amoria (volutes)
Amphithalamus (false rice-shells)
Amphitretus (octopuses)
Amygdalum (mussels)
Anabathron (false rice-shells)
Anachis (dove-shells)
Anadara (ark-shells)
Anapella (triangle-clams)
Anatoma (slit-shells)
Anatrophon (trophon-shells)
Anisodonta (anisodonta-clams)
Anomia (jingle-shells)
Antiguraleus (turrid-cone-shells)
Antisabia (bonnet-limpets)
Aphelodoris (sea-lemons)
Apicalia (seastar-snails)
Apixystus (trophon-shells)
Aplysia (sea-hares)
Archidoris (sea-lemons)
Archiminolia (top-shells)
Architeuthis (squid)
Argalista (argalista-shells)
Argobuccinum (tritons)
Argonauta (nautiluses)
Armina (sea-slugs)
Arthritica (lepton-clams)
Ascobulla (bubble-shells)
Ascorhis (hydrobiid-shells)
Asperdaphne (turrid-cone-shells)
Astele (top-shells)
Asteracmea (limpets)
Astralium (star-shells)
Atagema (sea-lemons)
Ataxocerithium (false-creepers)
Atrina (pen-shells)
Attenuata (rice-shells)
Austraeolis (sea-slugs)
Austrocardiella (condyl-clams)
Austrocarina (turrid-shells)
Austrocochlea (top-shells)
Austrocylichna (peanut-shells)
Austrodrillia (turrid-shells)
Austroginella (margin-shells)
Austroharpa (harp-shells)
Austroliotia (liotia-shells)
Austrolittorina (australwinks)
Austromitra (ribbed-mitres)
Austromytilus (mussels)
Austropusilla (turrid-shells)
Austrorissopsis (aclidid-shells)
Awanuia (aclidid-shells)