Lateral view of Goniodoris castanea. Length 10mm. Erect rim and medial ridge on the reduced mantle. Gills partially expanded. LWS, Menai Strait, Wales. April 2011. Species Goniodoris castanea Photographer / copyright holder I.F. Smith
Dorsal view of adult Goniodoris castanea. Image from Alder & Hancock. Translucent features clearly defined. Species Goniodoris castanea Photographer / copyright holder I.F. Smith
Dorsal view of juvenile Goniodoris castanea. Length 7mm. Rhinophores and gills almost invisible as translucent/ transparent. On rocky shore exposed to strong currents, ELWS, Menai Strait, Wales. March 2011. Species Goniodoris castanea Photographer / copyright holder I.F. Smith
Dorsal view of Goniodoris castanea. Length 10mm. On rocky shore exposed to strong currents, LWS, Menai Strait, Wales. April 2011. Species Goniodoris castanea Photographer / copyright holder I.F. Smith
Oblique view of Goniodoris nodosa. Elevated thin undulating dorsal ridge clearly visible. Length 12mm. On rocky shore exposed to strong currents, ELWS, Menai Strait, Wales. March 2011. Species Goniodoris nodosa Photographer / copyright holder I.F. Smith
Rhinophore of Goniodoris nodosa. Lamellae incomplete on anterior face. Body length 12mm. On rocky shore exposed to strong currents, ELWS, Menai Strait, Wales. March 2011. Species Goniodoris nodosa Photographer / copyright holder I.F. Smith
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. Species Goniodoris nodosa Photographer / copyright holder I.F. Smith
Dorsal view of Goniodoris nodosa. Length 12mm. On rocky shore exposed to strong currents, ELWS, Menai Strait, Wales. March 2011. Found by spawn. Species Goniodoris nodosa Photographer / copyright holder I.F. Smith
Potamopyrgus antipodarum pool fed by drain at top of salting, Dee Estuary, Cheshire. Salinity 0 p.p.t. Filamentous algae over bare sand, black and anaerobic below surface. Near high water mark; Scirpus maritimus beyond log in image. Species Potamopyrgus antipodarum Photographer / copyright holder I.F. Smith
Potamopyrgus antipodarum snouts may be slightly transversely wrinkled when contracted. Tentacles translucent light grey, darkest dorsally except, often, for a fine faint white medial line. Species Potamopyrgus antipodarum Photographer / copyright holder I.F. Smith
