Polycera quadrilineata. Gill fan folded backwards. Body may conceal foot (right), or foot may spread laterally into view (left). On prey; Membranipora membranacea on Laminaria frond. Menai Strait, Wales. Feb. 2011. Species Polycera quadrilineata (O. F. Müller, 1776) Photographer / copyright holder I.F. Smith
Polycera quadrilineata. Length 20mm. Scarlet faeces being excreted from anus on gill-fan stem. When defecating, gill fan can be held vertically to avoid fouling of gills. White penis behind right rhinophore. Menai Strait, Wales. March 2010. Species Polycera quadrilineata (O. F. Müller, 1776) Photographer / copyright holder I.F. Smith
Polycera quadrilineata. Length 20mm. Yellow viscera. Anterior veil with four elongate yellow processes. Dorsally yellow, propodial tentacles. Semi-circular oral area with curved perpendicular white flange at each side. Menai Strait, Wales. Feb. 2011 Species Polycera quadrilineata (O. F. Müller, 1776) Photographer / copyright holder I.F. Smith
Polycera quadrilineata. Length 20mm. Apart from appendages, yellow pigment restricted to row of marks on dorsum and marks on mantle rim. Pale dull orange digestive gland below gills. White buccal mass below rhinophores. Menai Strait, Wales. Feb. 2011. Species Polycera quadrilineata (O. F. Müller, 1776) Photographer / copyright holder I.F. Smith
Polycera quadrilineata. Length 20mm. Specimen heavily marked with many black lines, yellow marks and areas of black. Menai Strait, Wales. March 2010 Species Polycera quadrilineata (O. F. Müller, 1776) Photographer / copyright holder I.F. Smith
Polycera quadrilineata. Yellow marks on reduced mantle rim and flanks. Triangular process at rim's anterior. 7 white, simply pinnate gills, yellow distally, around dorsal anus. Anterior veil with 6 elongate yellow processes. Menai Strait, Wales. Feb.2011 Species Polycera quadrilineata (O. F. Müller, 1776) Photographer / copyright holder I.F. Smith
Ancula gibbosa. Length 10mm. Short oral tentacles on head; no propodial tentacles on foot. Two forward pointing elongate papillae at base of each rhinophore. Five papillae on mantle-rim shield each side of gills. ELWS. Menai Strait, Wales. March 2011. Species Ancula gibbosa Photographer / copyright holder I.F. Smith
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. Species Ancula gibbosa Photographer / copyright holder I.F. Smith
Ancula gibbosa. Length 10mm. Ten lamellae on rhinophore. Reduced mantle rim carrying erect elongate papillae at side of gills. Brown viscera visible below gills. Extreme low water spring tide, Menai Strait, Wales. March 2011. Species Ancula gibbosa Photographer / copyright holder I.F. Smith
Ancula gibbosa. Length 10mm. Three white translucent tripinnate gills around brown anus. Gills shielded by ten elongate papillae. Yellow medial dorsal ridge on posterior third of body. ELWS. Menai Strait, Wales. March 2011. Species Ancula gibbosa Photographer / copyright holder I.F. Smith
