Eubranchus tricolor
| Painted balloon aeolis | |
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| The nudibranch Eubranchus tricolor, Firth of Lorne, Scotland. | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| (unranked): |
clade Heterobranchia clade Euthyneura |
| Superfamily: | Fionoidea |
| Family: | Eubranchidae |
| Genus: | Eubranchus |
| Species: | E. tricolor |
| Binomial name | |
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Eubranchus tricolor Forbes, 1838 |
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| Synonyms | |
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clade Euthyneura
clade Nudipleura
clade Nudibranchia
clade Dexiarchia
clade Cladobranchia
clade Aeolidida
Eubranchus tricolor, common name the painted balloon aeolis, is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Eubranchidae. It is the type species of the genus Eubranchus.
According to Pruvot-Fol (1954) the species Amphorina alberti Quatrefages, 1844 is a synonym of Eubranchus tricolor. Opinion 774 of the ICZN decided that Amphorina alberti was a synonym of Eubranchus farrani and suppressed the names Amphorina and A. alberti.
This species was first described from the Isle of Man, Irish Sea, United Kingdom. It has subsequently been reported from all around Britain and Ireland, as well as from continental coasts from Norway to Portugal and into the Mediterranean Sea.
This aeolid nudibranch is translucent white with rings of white, yellow and white at the tips of the cerata. The cerata are swollen and translucent with a narrow digestive gland which is usually dull purple in colour. There is a superficial resemblance to Janolus cristatus.
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