Akera is a marine genus of sea hare in the family Akeridae, known from the late Callovian (Jurassic) to the recent periods.
Akera bullata, named the royal flush sea slug, is a species of sea snail, a marine opisthobranch gastropod mollusk in the family Akeridae, a family that is related to the sea hares. This species is the only European representative of the genus Akera.
Mangelia labratula is an extinct species of sea snail, a marine gastropod mollusk in the family Mangeliidae.
Crassispira hypermeces is an extinct species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.
Crassispira plateaui is an extinct species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.
Crassispira nana is an extinct species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.
Crassispira nodulosa is an extinct species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.
Crassispira subgranulosa is an extinct species of sea snail, a marine gastropod mollusc in the family Pseudomelatomidae, the turrids and allies. Fossils of this extinct marine species were found in Eocene strata of the Paris Basin, France.
Crassispira margaritula is an extinct species of sea snail, a marine gastropod mollusc in the family Pseudomelatomidae, the turrids and allies. Fossils of this extinct marine species were found in Eocene strata of the Paris Basin, France.
Crassispira margaritula is an extinct species of sea snail, a marine gastropod mollusc in the family Pseudomelatomidae, the turrids and allies.
Knefastia decipiens is an extinct species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.
Knefastia polygona is an extinct species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.
Raphitoma gougeroti is an extinct species of sea snail, a marine gastropod mollusc in the family Raphitomidae.
Urosalpinx baudoni is an extinct species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.
Trophonopsis bonneti is an extinct species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.
Trophonopsis sublamellosa is an extinct species of sea snail, a marine gastropod mollusk in the family Muricidae, the murex snails or rock snails.
Akera bayeri is a species of sea snail, a marine opisthobranch gastropod mollusk in the family Akeridae, a family that is related to the sea hares.
Akera silbo is a species of sea snail, a marine opisthobranch gastropod mollusk in the family Akeridae, a family that is related to the sea hares.
Akera soluta is a species of sea snail, a marine opisthobranch gastropod mollusk in the family Akeridae, a family that is related to the sea hares.
Akera spirata is an extinct species of sea snail, a marine opisthobranch gastropod mollusk in the family Akeridae, a family that is related to the sea hares.
