Asellus aquaticus (Linnaeus, 1758)

Common name

Two-spotted Waterlouse
Two-spotted Water-slater

Status

GB IUCN status: Least Concern

Identification

This species can usually be distinguished from the frequent Proasellus meridianus by the pattern of pigmentation of the head, with two pale spots at the back separated by a central dark pigmented area.  However, the two are frequently confused.  The shape of the male first pereopod is diagnostic.
Keith Lugg
R.E. Jones

Distribution and Habitat

A. aquaticus is abundant throughout the British Isles, occurring in a wide variety of water-bodies, including small urban garden ponds, ditches, lakes, canals and rivers.
 
It can be found among water plants, under stones and submerged bits of dead wood, among the roots of riparian trees and on the stonework of bridges.  It is tolerant of organically polluted waters, high salinities, low pH and high metal concentrations.

Distribution

Reference

Gregory, S. (2009) Woodlice and Waterlice (Isopoda: Oniscidea & Asellota) in Britain and Ireland.  Field Studies Council/Centre for Ecology & Hydrology.

idBmigTaxa

91

BRC Code

Cru_1100