Tritoniidae are a family of nudibranchs, shell-less marine gastropod molluscs or sea slugs, and the only member of the superfamily Tritonioidea and the suborder Tritoniacea. This family includes some of the largest known nudibranchs, with the NE Atlantic species Tritonia hombergii reaching 20 cm in length.
Distribution These nudibranchs occur worldwide in warm and temperate seas and in the coldest waters and deep sea, wherever the octocorals which they eat are found.
Ecology Members of the family Tritoniidae feed on octocorals, including sea pens, alcyonarian soft corals, and gorgonians, often being cryptic in shape and colouration upon them. They share this trait with the Arminidae which were previously thought to be only distantly related, but have been shown to be closely related to the Tritoniidae by a recent study.
Taxonomy Distributed among two subfamilies, the following genera are recognised in the family Tritoniidae:
Subfamily Marioniinae F. V. Silva, Pola & Cervera, 2023 Genus Marionia Vayssière, 1877 Genus Marioniopsis Odhner, 1934 Genus Paratritonia Baba, 1949 Subfamily Tritoniinae Lamarck, 1809 Genus Candiella J. E. Gray, 1850 Genus Marianina Pruvot-Fol, 1931 Genus Myrella Odhner, 1963 Genus Tochuina Odhner, 1963 Genus Tritonia Cuvier, 1797 Genus Tritonicula Korshunova & Martynov, 2020 Genus Tritonidoxa Bergh, 1907 Genus Tritoniella Eliot, 1907 Genus Tritoniopsis Eliot, 1905
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