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DescriptionCoryphella gracilis has a translucent white body with tentacles (cerata) filled with red-coloured digestive gland. There are up to six clusters of cerata that all have thin rings of white pigments at the tips. This small species can grow up to 1.5 cm in length, and can be easily confused with juveniles of other Coryphella species. However, mature individuals, of 1-1.2 cm long, have opaque white globules (ovotestis) present internally, which can be seen through their translucent bodies. These globules are absent from juveniles. Feeds on hydroids especially Eudendrium spp. The eggs are spawned in the form of a white string wound amongst the food and when laid flat forms a squared-spiral shape.Individuals with green coloured cerata occur occasionally and have been recorded as the variety Coryphella gracilis smaragdina. Coryphella in Latin means 'little-headed'. Feeds on hydroids, especially Eudendrium arbusculum and is usually found in large numbers (Picton & Morrow, 1994).