One-spotted Waterlouse - Proasellus meridianus

This species can usually by distinguished from Asellus aquaticus by the continuous pale band along the posterior margin of the head.  However, care is needed since the two species are frequently confused. The shape of the male first pereopod is diagnostic.

Asellus aquaticus is very similar but this species has two pale spots on its head, rather than the single bar of Proasellus meridianus.

• single pale bar on the top of the head

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Often found in stagnant water as they can tolerate low oxygen levels.  They do not swim well but tend to crawl around weed and mud.

All year round.

They are detritus feeders, eating decaying organic matter.  The species breeds throughout the vegetation period, most frequently in spring. Females carry eggs in brood pouches underneath their body.

Widespread and fairly frequent in Britain.

Status in Leicestershire and Rutland not known.