Two-spotted Waterlouse Asellus aquaticus (Linnaeus, 1758) 
This Waterlouse is widespread in Nottinghamshire and no doubt very much under-recorded, despite the sterling efforts of Bob Merrit, who provided most of the county's records between 2001 and 2014. Asellus aquaticus identification is quite easy for those living in Nottinghamshire, with only Proasellus meridianus (just three county records) for confusion. Identification of the two is easily achieved by examination of the pale markings present at the rear of the head, which in Asellus aquaticus takes the form of two pale spots separated by a darker area of pigmentation.
Nottinghamshire (VC56) distribution of Asellus aquaticus 
The records for the Nottinghamshire distribution map are currently provided by the following contributors - Bob Merritt. Trevor and Dilys Pendleton. Stuart Warrington. The National Trust (Clumber Park invertebrate records). David Shaw. Steve Gregory.

You can contribute your own records to help us gain an accurate status of this species in Nottinghamshire. Send an Excel spreadsheet of your records via the 'contact us' link at the top of the homepage.

Updated January 2024

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