| Hypselodoris tryoni | |
|---|---|
 | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Heterobranchia |
| Order: | Nudibranchia |
| Suborder: | Doridina |
| Superfamily: | Doridoidea |
| Family: | Chromodorididae |
| Genus: | Hypselodoris |
| Species: | H. tryoni |
| Binomial name | |
| Hypselodoris tryoni | |
| Synonyms [2] | |
| |
Hypselodoris tryoni is a species of sea slug, a dorid nudibranch, a marine gastropod mollusk in the genus Chromodorididae. [2]
The decision to include Risbecia species within the family Hypselodoris was made on the basis of a molecular (DNA) study which showed that Risbecia species are a clade inside the genus Hypselodoris as currently constituted. [3]
This species was described from the Society Islands. It is reported to occur widely in the tropical Western Pacific Ocean from Australia to the Philippines. [4] [5] [6]
Hypselodoris tryoni has a brown body and white foot. The body and upper dorsum are covered in purple spots ringed with white or light-brown. The gills are typically translucent white or light-brown and the rhinophores are brown to dark-brown and covered in circular white lines. It has a thin blue or purple line on the mantle edge. [7] There is some colour variation between individuals. Hypselodoris tryoni is similar in appearance to Goniobranchus geminus , Goniobranchus kuniei and Goniobranchus leopardus , although it lacks the wide purple mantle edge line present in those species. Goniobranchus species also tend to have a lower, more rounded body. [8] Sea slugs such as Hypselodoris tryoni, are known to exhibit trailing behaviour where up to four animals will follow one another very closely, often touching. It is not known what causes this behaviour. [9]
Hypselodoris tryoni reaches at least 60 mm in length and has been observed to raise and lower its head while crawling. [10]
Like many slugs in the genus Chromodorididae, Risbecia tryoni feeds on sponges and have been seen feeding on sponges from the family Dysidea . When feeding they are sometimes accompanied by a group of shrimp, Periclimenes imperator , in an apparent form of commensalism. [11]
Chromodorididae, or chromodorids, are a taxonomic family of colourful, sea slugs; dorid nudibranchs, marine gastropod mollusks in the superfamily Doridoidea. “Chromodorid nudibranchs are among the most gorgeously coloured of all animals.” The over 360 described species are primarily found in tropical and subtropical waters, as members of coral reef communities, specifically associated with their sponge prey. The chromodorids are the most speciose family of opisthobranchs. They range in size from <10mm to over 30 cm, although most species are approximately 15–30 mm in size.
Chromodoris is a genus of very colourful sea slugs or dorid nudibranchs, marine gastropod molluscs, and the type genus of the family Chromodorididae. Within the genus Chromodoris, there are currently 101 classified species. Species within Chromodoris are commonly found in tropical and subtropical waters, living as members of reef communities and preying primarily on sponges. A molecular phylogeny of the family Chromodorididae resulted in this genus being restricted to a smaller number of species than formerly, most of which have longitudinal black lines on the mantle. Many former members of Chromodoris were transferred to Goniobranchus
Goniobranchus coi is a species of very colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.
Goniobranchus geminus, also known as the gem sea slug, is a species of very colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.
Goniobranchus aureopurpureus is a species of very colourful sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.
Goniobranchus kuniei is a species of very colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.
Goniobranchus collingwoodi, common name Collingwood's chromodoris, is a species of very colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.
Goniobranchus annulatus is a species of sea slug, a very colourful dorid nudibranch, a shell-less marine gastropod mollusc in the family Chromodorididae.
Risbecia is a genus of colorful sea slugs, dorid nudibranchs, shell-less marine gastropod mollusks in the family Chromodorididae.
Goniobranchus albopunctatus is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.
Goniobranchus alius is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.
Goniobranchus loringi is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae. This species was transferred from Chromodoris to Goniobranchus in 2012.
Goniobranchus gleniei is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.
Goniobranchus multimaculosus is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae. This species was transferred from Chromodoris to Goniobranchus in 2012.
Goniobranchus rufomaculatus is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.
Goniobranchus tennentanus is a species of colourful sea slug in the family Chromodorididae.
Hypselodoris pulchella is a species of sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.
Hypselodoris imperialis is a species of sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.
Hypselodoris ghardaqana is a species of sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.
Goniobranchus leopardus, is a species of colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.
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