Maintaining a national checklist for a taxon as large as spiders is a monumental task and Alastair Lavery has again updated the UK list, last published in 2019. This update recognises 680 established UK species, an increase of 15 in the last five years. Particularly notable is the number of species in anthropic habitats (buildings) - many of these are surely on the edge, waiting until the climate favours their spread outdoors. Also of interest is the discussion around the yet undescribed spider Megalepthyphantes cf. collinus and Mastigusa where for the first time in a Checklist, I am honoured to be referenced (even if my name is only spelt right once :-)
Lavery, A.H. (2025) The spiders of Great Britain and Ireland: 2025 checklist. Arachnology, 20(3), 410-427. https://doi.org/10.13156/arac.2024.20.3.8
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