About Coryphella gracilis (Alder & Hancock, 1844)
Coryphella gracilis (Alder & Hancock, 1844) has a narrow body, with its cerata arranged in clearly defined clusters. The cerata have a narrow band of white pigment at their tip, and this pigment band is often broken into separate spots. Mature individuals of this species usually reach 12–15 mm in body length, and the maximum recorded body length for the species is 25 mm. This species was first described from specimens collected at Cullercoats in the North Sea. It is a fairly common species that lives in current-swept habitats, ranging from northern France to Norway and Iceland. It has also been reported along the East coast of North America, from Newfoundland south to New England. The minimum recorded depth where Coryphella gracilis occurs is 0 m, while the maximum recorded depth is 33 m. This species feeds exclusively on hydroids belonging to the genus Eudendrium.
