Alder & Hancock, 1862
The flattened body may reach 6 mm in extended length, in colour usually dark brown or black, but in the variety pellucida Kevan, the body is yellow with the greenish digestive gland visible through the translucent skin. All these colour patterns will fade if the animals are starved. The head is without trace of tentacles, distinguishing this species at a glance from Limapontia capitata and Limapontia senestra , which usually exhibit either crests or finger-like head-tentacles. Furthermore, the anal and renal openings are situated near the midline, some distance apart and with the anus near to the posterior tip of the body.
This species is a characteristic inhabitant, with Alderia modesta of saltmarshes. It is only rarely found in pools, but more commonly on damp mud adjacent to the moister places, crawling and feeding upon the alga Vaucheria . Under exceptional circumstances (extremes of temperature or humidity) the slugs burrow into the mud, where they may remain for weeks at a time. The salinity tolerance is not great (contrary to Alderia modesta , which lives in the same kind of habitat), and specimens live best in approximately 25 ä sea water. It favours those levels on a saltmarsh which are only rarely wetted by the tide.
Distribution from the Baltic Sea to the Bassin d'Arcachon (Distr. L. depressa).