Non-Native British Arachnids

Introduction

The following table provides a list of non-native spiders and other arachnids known to the author as having been recorded in Britain as a consequence of being introduced via various vectors. This includes those discovered within packaged fresh food such as fruit and vegetables, or the horticultural trade (e.g. garden centres), or are only known from heated biomes such as butterfly-farms, tropical houses etc. It excludes those deliberately imported or bred for the pet trade but if an individual is subsequently discovered in a free state (i.e. wandering outwith the intended enclosure), this would be included for the purposes of completeness.

They typically occur as adventives (one-offs) or can only maintain populations in heated biomes such as hot houses or greenhouses. The majority of species are not included in the main British list published by Lavery (2019) with the exception of those taxa whose Anthropogenic Status is marked as 'Ag' which Lavery (op. cit.) defined as those that are exclusively (or almost exclusively) in greenhouse-like structures. The list also includes those in his Appendix B1 and B2.

Thus, all species listed are unlikely (or cannot) survive outdoors and exclude taxa which have been introduced to Britain but are now established such as Pholcus phalangioides or Steatoda nobilis. The recent discovery of Badumna longinqua as reported in Lavery (2021) is, for the time being, included in the list below. However, it may soon require deletion if the population, which does occur outside, sustains itself.

It is perhaps necessary to consider what is a self-sustaining population: i.e. if a species is recorded from the same or near-vicinity for multiple years, then it would likely merit inclusion in one of Lavery (2019) appendices. 

The table has been amended from Wilson (2012) with additional references cited for taxa subsequently added.

To the author's knowledge, there is no other list of such taxa maintained in Britain and it is intended that this list will be maintained on an ad hoc basis for the purposes of keeping a record. Any readers who are able to add verifiable records can contact he author: aoc [at] britishspiders.org.uk

Order: Arachnida (Spiders)

Family..............................Species
Cyrtaucheniidae.................Ancylotrypa sp. Simon, 1889
Theraphosidae...................Cyriocosmus elegans (Simon, 1899)
.......................................Euathlus sp. Ausserer, 1875
.......................................Hapalopus sp. Simon, 1891
.......................................Phormictopus sp. Pocock, 1901
Pholcidae...........................Artema atlanta Walckenaer, 1837
........................................Holocnemus caudatus (Dufour, 1820)
........................................Holocnemus pluchei (Scopoli, 1763)
........................................Spermophora kerinci Huber, 2005
Oonopidae.........................Diblemma donisthorpei O. P. -Cambridge, 1908
........................................Ischnothyreus velox Jackson, 1908
........................................Triaeris stenaspis Simon, 1891
Oecobiidae.........................Uroctea durandi (Latreille, 1809)
.........................................Oecobius navus Blackwall, 1859
Uloboridae..........................Uloborus plumipes Lucas 1846
Nesticidae...........................Nesticella mogera (Yaginuma, 1972)
Theridiidae..........................Parasteatoda tepidariorum (C.L. Koch, 1841)
.........................................Coleosoma floridanum Banks, 1900
.........................................Nesticodes rufipes (Lucas, 1846)
.........................................Steatoda paykulliana Walckenaer, 1806
Titanoecidae........................Nurscia albofasciata (Strand, 1907)
..........................................Pandava laminata (Thorell, 1878)
Araneidae...........................Cyrtophora citricola Forsskal, 1775
Anapidae............................Pseudanapis aloha Forster, 1959
Salticidae............................Hasarius adansoni (Audouin, 1826)
.........................................Helpis occidentalis Simon, 1909
.........................................Icius hamatus (C.L. Koch, 1848)
.........................................Menemerus bivittatus (Dufour, 1831)
.........................................Panysinus nicholsoni (O.P. -Cambridge, 1899)
.........................................Phylaeus chrysops (Poda 1761)
.........................................Plexippus paykulli (Audouin, 1826)
.........................................Phidippus johnstoni (Peckham & Peckham, 1883)
.........................................Zygoballus rufipes Peckham & Peckham 1885
Sparassidae.........................Barylestis variatus (Pocock, 1899)
..........................................Heteropoda venatoria (Linnaeus, 1767)
..........................................Olios sanctivincentii (Simon, 1897)
Desidae...............................Badumna longinqua (L. Koch, 1867
Ctenidae..............................Acanthoctenus spiniger Keyserling, 1877
..........................................Phoneutria sp. Perty, 1833
Linyphiidae...........................Mermessus denticulatus (Banks, 1898)

Order: Opiliones (Harvestmen)

Family..............................Species
Sclerosomatidae...................Leiobunum limbatum L. Koch, 1861

Order: Pseudoscorpiones (Pseudoscorpions)

Family..............................Species
Chernetidae.........................Americhernes oblongus Say, 1821

Acknowledgements

I'd like to thank Danniella Sherwood (NHM, London), Alistair Lavery, Matt Prince and Geoff Oxford for providing references and comments in constructing the above list.

References

Cathrine, C. and Longhorn, S.  (2017) Record of Phoneutria (Araneae: Ctenidae) from Inverbervie, Aberdeenshire. Newsletter of the British Arachnological Society, 139: 13 - 15

Gabriel, R. and Sherwood, D.  (2020) Further cases of conjoining anomaly in theraphosid spiders (Araneae: Theraphosidae). Acta Arachnologica, 69(1): 27-30 (Hapalopus sp.)

Lavery, A.  (2019) A revised checklist of the spiders of Great Britain and Ireland. Arachnology, 18(3): 196 - 213

Lavery, A. (2021) Wildlife Reports: Arachnids. British Wildlife, 33(3): 218

Logunov, D.V. and Popovici, G.  (2021) On Two New Non-Native Species of Spiders (Araneae: Salticidae and Titanoecidae) from the United Kingdom. Newsletter of the British Arachnological Society, 152: 5 - 6 (Helpis occidentalis & Nurscia albofasciata)

Parker, B.  (2020) A new spider species for the United Kingdom - Pandava laminata (Thorell, 1878). Newsletter of the British Arachnological Society, 149: 17 - 18

Poole, J. (2021) Central American Salticid Found in Dorset. Newsletter of the British Arachnological Society, 151: 5 (Zygoballus rufipes)

Sherwood, D.  (2021) On a Theraphosid Spider Discovered as a Stowaway in Fruit from the Dominican Republic (Araneae: Theraphosidae). Newsletter of the British Arachnological Society, 150: 4 - 5 (Phormictopus sp.)

Sherwood, D. and Gabriel, R.  (2021) On a juvenile of the genus Euathlus Ausserer, 1875 found in the United Kingdom in imported blueberries from Chile (Araneae: Theraphosidae). Revista IbĂ©rica de AracnologĂ­a, 38: 203 - 204

Wilson, R. (2012) An American Jumper in Leeds, West Yorkshire and an Update on Non-Native Taxa Recorded in the UK. Newsletter of the British Arachnological Society, 123: 10 - 15

Number of Spider Species: 40
Number of Harvestmen Species: 1
Number of Pseudoscorpion Species: 1

Author: Richard Wilson
Last Updated: 8th January 2022
Suggested citation: Wilson, R. [year of last update] Non-native British Arachnids in Spider and Harvestman Recording Scheme Website. https://srs.britishspiders.org.uk/portal.php/p/Non-Native%20British%20Arachnids. Last accessed [insert date of last access].