British Arachnological Society

@britishspiders.bsky.social

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The British Arachnological Society (BAS) is the UK’s only body devoted exclusively to the study of arachnids (spiders, harvestmen & pseudoscorpions): https://britishspiders.org.uk. To record GB spiders, please use https://irecord.org.uk/enter-srs-records.

Hectad map of Britain showing the July 2026 distribution of Wasp Spider Argiope bruennichi
Hectad map of GB showing the increasing range of Enoplognatha latimana, a Candy-striped spider.
Hectad map of GB showing the occurrence of Nigma flavescens to July2026 - currently confined to Kent.
Hectad map of Britain showing to July 1012 records for Nigma walckenaeri.
GB distribution of Wasp Spider Argiope bruennichi to July 2026
A Labyrinth Spider in her web
Flower Crab Spider Misumena vatia with prey on an Elder flowerhead.
GB map showing the hectad distribution of Trachyzelotes pedestris
Porrhoclubiona genevensis. Image thanks to Tylan Berry.
Hectad map of Britain showing the May 2026 distribution of Steatoda nobilis Noble False Widow Spider.
Adult male nursery web spider.
Zelotes electus, female
On Wangford Warren
The GB hectad distribution map for Synema globosum, showing just five hectad records in S and E England since 2003. British Arachnological Society © All Rights Reserved
Calositticus caricis eating a springtail
GB hectad distribution map for Argiope bruennichi from the new SRS Atlas
GB hectad map for the distribution of Aelurillus v-insignatus, showing most of the population concentrated in southern England
Map showing confirmed records of Anyphaena numida as of Feb 2026
The ant hunting Five-spotted Ground Spider Callilepis nocturna is confined to just three sites and is considered Vulnerable to extinction in Britain. Image copyright: Richard Gallon.
The Sand Running Crab Spider Rhysodromus fallax must be one of the best camouflaged species in Britain. Confined to the seaward edges of sand dune it's considered Vulnerable to extinction. Image copyright: Richard Gallon
The Money spider Eriogone welchi occurs at altitude in very wet Sphagnum moss lawns: it is Red Listed as Endangered. Image copyright: Richard Gallon.
The Marsh Wolf Spider Hygrolycosa rubrofasciata, restricted to a handful of fens in East Anglia and southern England, is currently Endangered but loss from known sites puts it as risk of becoming Critically Endangered. Image copyright: Richard Gallon
The Horrid Ground Weaver Nothophantes horridus is thought to be the only spider endemic to Britain and is considered Critically Endangered both here and globally. It's restricted to limestone areas around Plymouth. Image thanks to John Walters via a Creative Commons Attribution-Share Alike 4.0 International license.
The Reed Jumping Spider Marpissa rasdiata, typical of alkaline fens, is Red Listed in GB as Vulnerable to extinction. Image copyright: Alan Thornhill
Spider Recording Scheme/iRecord map of the current distribution of Megalepthyphantes sp. nr. collinus
Female Fen Rat Spider Dolomedes plantarius holding her silk egg sac full of hatched spiderlings
Original image of a Californian Trap Door Spider Burrow thanks to Creative Commons CC0 1.0 Universal Public Domain Dedication.
Californian Trap Door Spider: image thanks to Creative Commons CC0 1.0 Universal Public Domain Dedication
Spider imagery appears in Andean works of art from the middle of the first millennium BCE this wondeful and delicate nose ornament comes from the Salinar culture: see metmuseum.org/art/collection/search/313364 for more information.
Californian Trap Door Spider burrow: image thanks to Creative Commons CC0 1.0 Universal Public Domain Dedication
Green Crab Spider Diaea dorsata: image thanks to Alan Thornhill
Californian Trap Door Spider burrow: image thanks to Creative Commons CC0 1.0 Universal Public Domain Dedication.
Scotophaeus blackwalli
The pseudoscorpion Chthonius ischnocheles: image thanks to Alan Thornhill.
Californian Trap Door Spider burrow: images thanks to Creative Commons CC0 1.0 Universal Public Domain Dedication.
Male Walckenaeria acuminata: Image thanks to Richard Gallon
Californian Trap Door Spider burrow: image Creative Commons CC0 1.0 Universal Public Domain Dedication.
The debris-covered silk 'stocking' of Atypus affinis: image thanks to Alan Thornhill
Californian Trap Door Spider burrow: image thanks to Creative Commons CC0 1.0 Universal Public Domain Dedication.
Female Trochosa terricola: image thanks to Alan Thornhill
Californian Trap Door Spider burrow: image thanks to Creative Commons CC0 1.0 Universal Public Domain Dedication.
Paroligolophus agrestis: image thanks to Alan Thornhill
Californian Trap Door Spider burrow: image thanks to Creative Commons CC0 1.0 Universal Public Domain Dedication
Californian Trap Door Spider burrow: image thanks to Creative Commons CC0 1.0 Universal Public Domain Dedication.
Cercidia prominens: image thanks to Ty Berry