Onchidoris bilamellata

Onchidoris bilamellata. Length 13mm. Head has large, curved, oral veil, often with wavy edge, white with slight yellow tint. Foot translucent white showing yellow or purple viscera, anterior smoothly curved, no indentation by mouth. Feb. 2013. Menai Str.

Species

Photographer / copyright holder

I.F. Smith

Onchidoris bilamellata. Length 13mm. Bulbous base of rhionophore recessed in pit. February 2013. Menai Strait, Wales.

Species

Onchidoris bilamellata

Photographer / copyright holder

I.F. Smith

Onchidoris bilamellata. Length 13mm. Round-headed, large and small club-shape tubercles cover mantle. Up to 16 oblique lamellae on rhinophores. Gills unipinnate. February 2013. Menai Strait, Wales.

Species

Onchidoris bilamellata

Photographer / copyright holder

I.F. Smith

Onchidoris bilamellata. Spawn masses, resemble everted, high, white collars. Adult on left. Low water spring tide, Mersey Estuary. Late January 2010.

Species

Onchidoris bilamellata

Photographer / copyright holder

I.F. Smith

Onchidoris bilamellata. Length of animal 40mm. Many large tubercles, and a few small gills, within main gill ellipse. Low water spring tide, Mersey Estuary. Late January 2010.

Species

Onchidoris bilamellata

Photographer / copyright holder

I.F. Smith

Onchidoris bilamellata. Juvenile, length 7mm. Dark brown gills and basal half of rhinophore. Dark brown dorsal panel stops behind rhinophores, leaving a pale area in front. Low water spring tide, Mersey Estuary. September 2010.

Species

Onchidoris bilamellata

Photographer / copyright holder

I.F. Smith

Onchidoris bilamellata. Juvenile, length 5mm. Dorsal panel, gills and basal half of rhinophore all brown. Low water spring tide, Menai Strait, Wales. August 2010.

Species

Onchidoris bilamellata

Photographer / copyright holder

I.F. Smith

Onchidoris bilamellata. Length 40mm. Dark brown dorsal panel. Basal two thirds of rhinophore brown. Large, translucent, whitish gills curving untidily outwards from transverse ellipse. Low water spring tide, Mersey Estuary. Late January 2010.

Species

Onchidoris bilamellata

Photographer / copyright holder

I.F. Smith

Onchidoris bilamellata. Length 40mm. Dark brown dorsal panel, rest of mantle fawn brown. Pale unpigmented club-shape tubercles on mantle. Low water spring tide, Mersey Estuary. Late January 2010.

Species

Onchidoris bilamellata

Photographer / copyright holder

I.F. Smith

References and links

Alder, J. & Hancock, A. 1845-1855. A monograph of the British nudibranchiate mollusca. London, Ray Society.
Thompson, T.E. & Brown, G.H. 1984. Biology of opisthobranch molluscs 2. London, Ray Society.
Current taxonomy: World Register of Marine Species (WoRMS)

Irish distribution map and prey organisms:
Picton, B.E. & Morrow, C.C., 2010. Encyclopedia of Marine Life of Britain and Ireland (EML)

Taxon version key

[NBNSYS0000176827]

Sort order

5419

Taxonomic group

Marine slug

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