Coryphella gracilis, sometimes known by the common name slender eolis, is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Flabellinidae Ekimova I., Carmona L., Mikhlina AL., Grishina D., Stanovova M.V., Schepetov D.M., Hoover C., de Souza-Canal J., Kuznetsov K.O., Valdés A.; (2026). Neither "lumpers" nor "splitters": A global revision of Flabellinidae s.l. nudibranchs (Gastropoda: Heterobranchia: Nudibranchia). PLoS One 21(5): e0347759. .
Distribution This species was described from Cullercoats, North Sea. It is a fairly common species found in current-swept sites from northern France to Norway and Iceland. It is also reported from the East coast of North America from Newfoundland south to New England.Rudman, W.B., 1999 (August 28) Flabellina gracilis (Alder & Hancock, 1844). [In] Sea Slug Forum. Australian Museum, Sydney.
Description Coryphella gracilis has a narrow body and cerata in well defined clusters. The cerata have a narrow band of white pigment at the tip which is often broken into spots. Mature animals typically measure 12–15 mm in length.Picton, B.E. & Morrow, C.C., 2010. Microchlamylla gracilis (Alder & Hancock, 1844) [In] Encyclopedia of Marine Life of Britain and Ireland. The maximum recorded body length is 25 mm.Welch J. J. (2010). "The “Island Rule” and Deep-Sea Gastropods: Re-Examining the Evidence". PLoS ONE 5(1): e8776. doi:10.1371/journal.pone.0008776.
Ecology Minimum recorded depth is 0 m. Maximum recorded depth is 33 m.
The diet of this species is hydroids of the genus Eudendrium.
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