Tritonioidea
Superfamily of shell-less sea slugs, sole member Tritoniidae.
Tritonioidea is a superfamily of nudibranchs, which are shell-less marine gastropods commonly called sea slugs. It contains only one family, Tritoniidae. Some of the largest nudibranchs belong to this group; for instance, *Tritonia hombergii* from the northeastern Atlantic can grow to 20 cm in length.
These sea slugs are found worldwide in warm, temperate, and even the coldest waters, as well as in the deep sea. Their distribution matches that of the octocorals they eat. Tritoniidae feed on octocorals such as sea pens, alcyonarian soft corals, and gorgonians, and they often blend in with these prey through cryptic shape and coloration. This trait is shared with the Arminidae, which were once considered only distantly related but are now known to be close relatives of Tritoniidae based on recent research.
The family Tritoniidae is divided into two subfamilies. The subfamily Marioniinae includes the genera *Marionia*, *Marioniopsis*, and *Paratritonia*. The subfamily Tritoniinae includes *Candiella*, *Marianina*, *Myrella*, *Tochuina*, *Tritonia*, *Tritonicula*, *Tritonidoxa*, *Tritoniella*, and *Tritoniopsis*.
Quick Facts
- Grandparent Authority
- Lamarck, 1809 sensu Minichev and Starobogatov, 1979
- Taxon
- Tritoniidae
Facts from the source article.
Lore & Background
Members of the family Tritoniidae, the only family in Tritonioidea, feed on octocorals, including sea pens, alcyonarian soft corals, and gorgonians. They are often cryptic in shape and colouration upon these corals. This feeding trait is shared 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. The family occurs worldwide wherever the octocorals they eat are found, including in warm and temperate seas, the coldest waters, and the deep sea.
Reader's Guide
The superfamily Tritonioidea is significant as it contains the family Tritoniidae, which includes some of the largest known nudibranchs, notably Tritonia hombergii reaching 20 cm in length. Its members are ecologically specialized feeders on octocorals, a trait that links them to the Arminidae, a relationship clarified by a recent study. The taxonomy of Tritonioidea is organized into two subfamilies—Marioniinae and Tritoniinae—encompassing 13 recognized genera. The superfamily's global distribution, from warm seas to deep cold waters, underscores its adaptability. Its legacy lies in representing a major lineage of shell-less molluscs that are both physically large and ecologically cryptic, contributing to the understanding of nudibranch diversity and evolutionary relationships.
Did You Know?
- Tritonioidea is the only superfamily in the suborder Tritoniacea.
- The family Tritoniidae includes some of the largest known nudibranchs.
- Tritonia hombergii, a NE Atlantic species, can reach 20 cm in length.
- Members of Tritoniidae feed on octocorals and are often cryptic in shape and colouration.
More in Nudibranchs and Sea Slugs 1-24
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