57 Gastropods described in 1991

Abyssochrysos bicinctus is a species of sea snail, a marine gastropod mollusk in the family Abyssochrysidae.

Abyssochrysos brasilianus is a species of sea snail, a marine gastropod mollusk in the family Abyssochrysidae.

Acochlidium fijiiensis is a species of freshwater gastropod, an aquatic gastropod mollusc within the family Acochlidiidae. Acochlidium fijiiensis has no shell.

Agagus stellamaris is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.

Ancistrobasis adonis is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Ancistrobasis boucheti is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Ancistrobasis caledonica is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Ancistrobasis scitula is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Ancistrobasis tiara is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Anxietas exigua is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Anxietas inspirata is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Arene boucheti is a species of sea snail, a marine gastropod mollusk in the family Areneidae.

Asthelys depressa is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Asthelys semiplicata is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Basilissopsis charcoti is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Botryphallus tuber is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.

Calliobasis festiva is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Calliobasis merista is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Calliobasis nepticula is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Calliobasis phimosa is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Calliobasis spectrum is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Carenzia acanthodes is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Carenzia nitens is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Carenzia ornata is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Carenzia serrata is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Clavus protentus is a species of sea snail, a marine gastropod mollusk in the family Drilliidae.

Coluzea faceta is a species of large sea snail, marine gastropod mollusk in the family Columbariidae.

Conasprella bozzettii is a species of sea snail, a marine gastropod mollusk in the family Conidae, the cone snails and their allies.

Conchatalos tirardi is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.

Coriocella hibyae, common name the Hiby's coriocella or the velvet snail, is a species of sea snail, a marine gastropod mollusk in the family Velutinidae.

Coryphellina delicata is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Flabellinidae.

Coryphellina exoptata, which can be translated as the much-desired flabellina or desirable flabellina, is a species of colourful sea slug, a nudibranch, a marine gastropod mollusc in the family Flabellinidae.

Eratasthelys corona is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Eumitra apheles is a species of sea snail, a marine gastropod mollusk, in the family Mitridae, the miters or miter snails.

Eumitra caledonica is a species of sea snail, a marine gastropod mollusk, in the family Mitridae, the miters or miter snails.

Eumitra imbricata is a species of sea snail, a marine gastropod mollusk, in the family Mitridae, the miters or miter snails.

Eumitra richeri is a species of sea snail, a marine gastropod mollusk, in the family Mitridae, the miters or miter snails.

Favartia varimutabilis is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.

Hadroconus grandiosus is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Halystina carinata is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

Hypermastus mareticola is a species of sea snail, a marine gastropod mollusk in the family Eulimidae.

Marginella caterinae is a species of sea snail, a marine gastropod mollusk in the family Marginellidae, the margin snails.

Microchlamylla amabilis is a species of sea slug, an aolid nudibranch, a marine gastropod mollusk in the family Flabellinidae.

Murexsul diamantinus is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.

Murexsul valae is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.

Muricopsis matildeae is a species of small sea snail, a marine gastropod mollusk in the family Muricidae, the rock snails.

Pagodula mucrone is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.

Perotrochus anseeuwi is a species of large sea snail, a marine gastropod mollusk in the family Pleurotomariidae, the slit snails.

Phyllidia marindica is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Phyllidiidae.

Phyllodesmium colemani is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Facelinidae.

Phyllodesmium iriomotense is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Facelinidae.

Phyllodesmium kabiranum is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Facelinidae.

Phyllodesmium magnum is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Facelinidae.

Phyllodesmium opalescens is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Facelinidae.

Samla bilas is a species of sea slug, an aeolid nudibranch, a marine heterobranch mollusc in the family Samlidae.

Samla riwo is a species of sea slug, an aeolid nudibranch, a marine heterobranch mollusc in the family Samlidae.

Timbellus crauroptera is a species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.