Description: The body of this rare nudibranch is pale green or pink with scattered white spots. There may be up to nine pairs of hand shaped ceratal processes. The rhinophores are unusual in that their tips are swollen and they have longitudinal lamellae. The oral veil is extended into two lateral flaps each with 3-4 finger-like projections. Adult specimens may reach 14mm in length.

Habitat: Feeds on the tiny hydroid Clytia hemisphaerica (C. johnstoni) which grows over other hydroids or on algae. The spawn is similar to Doto species, a flat ribbon laid in a concertina fashion, with a distinctive blue-white colour.

Distribution: Most of the records are from the Bay of Biscay, however it has also been recorded from Mediterranean France, Spain, Naples and north to St. John's Point, Co Donegal, NW Ireland. In recent years this species has been recorded further north in Britain and Ireland and in southern Norway.

Key Identification Features:

• Small hand-like ceratal processes.
• Swollen tipped rhinophores with sheaths and longitudinal lamellae.

Distribution Map from NBN: Hancockia uncinata at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Hancockia uncinata at iNaturalist World Species Observations database.

GBIF data for Hancockia uncinata

WoRMS: Hancockia uncinata at World Register of Marine Species. Accepted name: Hancockia uncinata (Hesse, 1872). AphiaID: 140081.

Classification: Biota; Animalia; Mollusca; Gastropoda; Heterobranchia; Euthyneura; Ringipleura; Nudipleura; Nudibranchia; Cladobranchia; Dendronotoidea; Hancockiidae; Hancockia