Lamellaria perspicua
Some pale animals resemble L. latens, and require examination of shell spire for positive identification if length of animal 10mm or less, [14].
Resembles a dorid sea slug but has anterior siphon [3] and no tentacles or gills on dorsal surface.
Adult body up to about 23mm, shell about 12mm longest dimension [1].
Body dorsum usually heavily tuberculated [4] .
Body profile dome [3] to almost cone [4].
Body ground colour varied, including lilac-grey.
Short spire protrudes [9] beyond outer lip of aperture when shell viewed in plan.
Rarely, if ever, over 10mm body length or 5mm shell longest dimension. Comparison [1].
Body dorsum nearly smooth, with a few small tubercles.
Body profile almost flat to upturned saucer, not dome.
Body ground colour can be white (also light-sandy brown, or yellowish buff) but never lilac-grey.
Spire barely perceptible, does not protrude beyond outer lip of aperture when shell viewed in plan.
Mediterranean to N. Norway and Iceland. (GBIF). In Britain and Ireland, common on most hard substrate shores and sea beds where compound ascidians occur. (UK interactive distribution map, NBN )