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Marine slugs

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.
Onchidoris bilamellata
Tergipes tergipes. Length 3mm. Cerata arranged singly, white cnidosacs inside tips. Rhinophores much longer than oral tentacles. White ovotestis in body. April 2011. LWS, Menai Strait, Wales
Tergipes tergipes
Philine punctata. Length 4mm. m: mantle covering shell. a: abrasion through mantle exposing shell. c: cephalic shield. p: parapodial lobe. On 10cm long stone encrusted with organisms. LWS, Menai Strait, Wales. April 2011.
Philine punctata
Lateral view of moving Lamellaria latens. Length 10mm. In Laminaria holdfast, LWS, Menai Strait, Wales. Feb. 2011.
Lamellaria latens
Lateral view of 20 mm long (excluding projections of foot and tentacles) L. perspicua. The dome is rarely depressed lower than in this picture, while L. latens always has a lower profile than this. LWS Menai Strait, Anglesey, Feb. 2011.
Lamellaria perspicua
Elysia viridis 2. Green parapodial lobes with dendritic digestive gland closely resemble a leaf. On red algae in rock pool. Lower shore, Dorset. January 2011.
Elysia viridis
Limapontia capitata. Length 3mm. Metapodium (tail), eye areas, rhinophoral crests and central area of back, all white. Small greenish patches with a few reflective flecks of green. Menai Strait, Wales. April 2011.
Limapontia capitata
Limapontia depressa. L. 5mm. Chrome-yellow. 1: side of foot. 2: edge of mantle. 3: pale patch marks vaginal opening. 4: point of penis eversion. 5: head overhanging anterior. 6: eye-patch rib in profile. Dee Estuary, Cheshire. July 2011.
Limapontia depressa
Limapontia senestra. Length 4.3mm. Pale patches weakly developed on dorsum and subdorsally. Pale digitiform rhinophores, eye patches and metapodium (tail). Medial notch in tip of metapodium. Yellowish penis below right eye. Orkney. March 1975.
Limapontia senestra
B. plumula, dorsal. L.13 mm. Reticulate pattern resembles its prey, Oscarella sp. (encrusting sponge), and a large transparent central spot revealing the dark interior of body resembles the osculum of the sponge. LWS, Menai Strait, Wales. March 2011.
Berthella plumula
Doto coronata. Length 10mm. Crimson surface pigment extending between cerata from dorsum onto flanks. 9 cerata each side (usual max. 8) and 6 rings of tubercles (usual max. 4) on some cerata. Black-red spheroids in tubercles. Orkney, April 1977.
Doto coronata
Dorsal view of Doto koenneckeri. Unpigmented pale subdorsal lines. Length 9mm. On Aglaophenia pluma on Halidrys siliqua, LWS, Menai Strait, Wales. August 2010.
Doto koenneckeri
Doto sarsiae. Length 8.5 mm. Large specimen with yellowish tinted epithelium and orange-red viscera. Tiny seventh pair of cerata concealed by sixth pair. On Garveia nutans, LWS, Menai Strait, Wales. April 2011. Conf. B. Picton.
Doto sarsiae
Lateral view of Goniodoris castanea. Length 10mm. Erect rim and medial ridge on the reduced mantle. On rocky shore exposed to strong currents, LWS, Menai Strait, Wales. April 2011.
Goniodoris castanea
Lateral view of Goniodoris nodosa. Length 12mm. Colourless gills. Mantle does not conceal sides of body. On rocky shore exposed to strong currents, ELWS, Menai Strait, Wales. March 2011. Found by spawn.
Goniodoris nodosa
Ancula gibbosa. Length 10mm. Sides of head extended into short oral tentacles, but no propodial tentacles on foot. Two forward pointing elongate papillae at base of each rhinophore. Extreme low water spring tide, Menai Strait, Wales. March 2011.
Ancula gibbosa
Onchidoris depressa. Length 4mm. Depressed profile. Long soft colourless tubercles. Rhinophores faintly yellowish, with oblique lamellae. Translucent gills on right of image. Menai Strait, Wales. September 2011.
Onchidoris depressa
Onchidoris inconspicua. Length 6mm. Seen from directly above against dark viscera, pale dorsal tubercles form light halos around their apical spots. Orkney. March 1975. det. Bernard Picton
Onchidoris inconspicua
Onchidoris muricata Length 8mm. r: round topped club-shape tubercles on periphery. f: flat topped club-shape tubercles on dorsum. g: translucent gills. Mantle raised showing dorsal surface of foot. Low water spring tide, Menai Strait, Wales. April 2011.
Onchidoris muricata
Onchidoris sparsa. 7.5mm (longer when extended). 1: Ground colour pinkish, seen in lines dissecting brown pigment. 2: Pale lines alternate with dark blocks around periphery. Click “View image details” for 3 –8.
Onchidoris sparsa
Adalaria proxima. Image from Alder & Hancock, as Doris aspera. Yellow form most frequent in southern Britain.
Adalaria proxima
Polycera quadrilineata. Yellow dorsal ridge on tail. Yellow marks on reduced mantle rim and flanks. 7 white, simply pinnate gills, yellow distally, around dorsal anus. Anterior veil with 6 elongate yellow processes. Menai Strait, Wales. Feb.2011
Polycera quadrilineata
Lateral view of Janolus hyalinus. Length 15mm. Foot nearly transparent with pigment flecks on dorsal surface. Metapodium extending from posterior tapers rapidly to fine point. In water’s edge, LWS, Menai Strait, Wales. April 2011.
Janolus hyalinus
Lateral view of Coryphella browni. Length 35mm. Cerata rise from a raised ridge of white flesh. On rocky shore exposed to strong currents, LWS, Menai Strait, Wales. February 2011.
Coryphella browni
Coryphella gracilis. Length 8.5mm. White pigment distally on rhinophores and oral tentacles. Medial line on tail reduced to a few opaque white dots. Thin subterminal white pigment band on cerata. LWS, Menai Strait, Wales. April 2011.
Coryphella gracilis
Coryphella lineata juvenile, 5mm long. Opaque white pigment line on oral tentacle, rhinophore, dorsum, flank and ceras (2). LWS, Menai Strait, September 2011.
Coryphella lineata
Coryphella verrucosa. Length 6,5mm. Internal pink diagonal band below rhinophores appears as a V in dorsal view. Several small cerata at bases of ceratal groups. Continuous white line on tail, but dorsal line not developed on this one.
Coryphella verrucosa
Lateral view of Flabellina pedata.
Flabellina pedata
Flabellina pellucida from Alder & Hancock, as Eolis pellucida. Coloured digestive gland in body connects bases of some cerata in this illustration.
Flabellina pellucida
Catriona gymnota. Length 6mm. Form with powdery distal area of cerata white only. At base of Tubularia on rocky shore exposed to strong currents, ELWS, Menai Strait, Wales. March 2011.
Catriona gymnota
Cuthona caerulea. Length 4mm. Olive green digestive gland. Only vestiges of orange bands below blue band. Apical orange is internal orange cnidosac plus orange surface pigment. LWS, Menai Strait, Wales. March 2012
Cuthona caerulea
Cuthona foliata. Length 6mm. Rhinophores densely covered in freckles of white pigment except for an encircling band of dull translucent orange. On rocky shore exposed to strong currents, LWS, Menai Strait, Wales. April 2011.
Cuthona foliata
Cuthona nana, length 6mm. Juvenile so cerata do not extend in front of rhinophores. On Hydractina echinata on shell of Hermit crab on shore with rocks and muddy sand. LWS, Menai Strait, Wales. March 2010.
Cuthona nana
Eubranchus exiguus. Cerata in groups of 1 large & 1 small; apical band of brown and white, with white band below. Two indistinct bands of brown flecks lower down, with scatter of white flecks. Peach digestive gland. LWS, Menai Strait, Wales. March 2011.
Eubranchus exiguus
Eubranchus farrani. Length 6mm. Much of of the dorsum exposed. Rhinophores and oral tentacles distally or entirely orange. Eyes set back from rhinophores. LWS, Menai Strait, Wales. August 2010.
Eubranchus farrani
Pale specimen of Facelina auriculata with purplish pink iridescence. Length 15mm. On rocky shore exposed to strong currents, LWS, Menai Strait, Wales. February 2011.
Facelina auriculata
Facelina bostoniensis. L.18mm. Foot much wider than body. Cerata long, linear, rather untidy and lack iridescence . Lamellated rosy fawn rhinophores. Internal mouthparts and oesophagus rose-pink. Laxford, Scotland. October 1975.
Facelina bostoniensis
Aeolidia papillosa. Pink-gray form. Cream triangle on head with vertices extended onto oral tentacles and between rhinophores. White tips on cerata. Conical rhinophores coloured as body, except pale tips. Lleyn Peninsula, Wales. Oct. 2009.
Aeolidia papillosa
Aeolidiella alderi. Typical specimen; white body and tentacles with distal pigment. Brown-filled cerata, except white anterior ruff. No pigment on dorsum. Triangular propodial tentacle continues curve of foot. Lough Hyne, Co. Cork, Ireland.
Aeolidiella alderi
Aeolidiella glauca. Length 20mm. Translucent orange rhinophores with distal white stipple. Anterior cerata form white ruff similar to that of A. alderi, but dorsum has stipple of A. glauca and animal stouter than A. alderi. Low water spring tide, Menai St
Aeolidiella glauca
Aeolidiella sanguinea. Orange specimen with orange-brown internal digestive gland, and distinct white tips on cerata. No surface pigment. Blood-red specimens also occur. LWS, Menai Strait, Wales. Sept. 2009.
Aeolidiella sanguinea