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Akera bullata 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.

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Gleba cordata is a species of sea butterfly, a floating and swimming sea snail or sea slug, a pelagic marine gastropod mollusk in the family Cymbuliidae.

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Iothia fulva is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lepetidae, one of the families of true limpets.

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Lamellaria latens is a species of small, slug-like sea snail, a marine gastropod mollusc in the family Velutinidae. It is native to the northeastern Atlantic Ocean and the Mediterranean Sea where it feeds on colonial ascidians.

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Lepeta caeca, common name the northern blind limpet, is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lepetidae, one of the families of true limpets.

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Limacia clavigera, sometimes known by the common name orange-clubbed sea slug, is a sea slug, a species of dorid nudibranch. It is a marine gastropod mollusc in the family Polyceridae.

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Onchidoris muricata is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Onchidorididae.

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Polycera quadrilineata, is a sea slug, a species of dorid nudibranch. It is a marine gastropod mollusc in the family Polyceridae. The specific epithet quadrilineata means four-lined and refers to the four longitudinal black lines present on the original specimen. This species is sometimes called the fourline nudibranch. In 2020 a integrative molecular and morphological study showed that P. quadrilineata was a complex of two species in the NE Atlantic and one of these species was given the new name Polycera norvegica.

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Tectura virginea is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae, one of the families of true limpets. It is commonly known as the white tortoiseshell limpet.

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Testudinalia testudinalis, common name the common tortoise limpet, is a species of sea snail, a true limpet, a marine gastropod mollusk in the family Lottiidae, one of the families of true limpets. It is commonly known as the plant limpet or tortoiseshell limpet.

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Velutina plicatilis is a species of small sea snail, a marine gastropod mollusk in the family Velutinidae.

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Velutina velutina, common name the velvet shell, is a species of small sea snail with a transparent shell, a marine gastropod mollusk in the family Velutinidae.