Appearance
Coryphellina exoptata is typically about 30 millimetres (1.2 in) in length when mature but can reach 48 millimetres (1.9 in).

Coryphellina exoptata, (Gosliner & Willan, 1991)
Coryphellina exoptata, which can be translated as the much-desired flabellina or desirable flabellina, common name “Cole’s nudibranch”, is a species of colourful sea slug, a marine gastropod mollusc in the family Flabellinidae.
Coryphellina exoptata is typically about 30 millimetres (1.2 in) in length when mature but can reach 48 millimetres (1.9 in).
This species was described from Madang, Papua New Guinea. Coryphellina exoptata is widespread throughout the tropical waters of the Indo-West Pacific.
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