Ischnothyreus velox Jackson, 1908
Description
Male palp with large spermal porus. Bulbus ventrally with protuberance. Embolus with 2 projections on tip. Epigyne not sclerotised. Prosoma yellow-brown, dark, surface granulated. Tibia I-II with 4 pairs. Metatarsus I-II and patella I-II with 2 pairs of robust spines. Opisthosoma yellow to brown, provided with long hairs, dorsal scuticula brown.
Body length male: 2 mmBody length female: 2 mm
Additional information
Probably occasionally mixed up with I. peltifer (Saaristo, 2010: 120).
Imported from tropical areas 100 years ago and now established in greenhouses. This species of SE-Asian origin is not native to Europe (alien species). It had been introduced to Europe at least once and did establish.
Distribution
Figures
Pedipalp
(Locket & Millidge 1951)
Pedipalp
(Bristowe 1948)
Pedipalp
(Saaristo 2001)
Pedipalp
(Locket & Millidge 1951)
Scutum, ventral view
(Saaristo 2001)
Vulva, dorsal view
(Song et al. 2024)
Vulva, ventral view
(Song et al. 2024)
Prosoma, frontal view
(Song et al. 2024)
Opisthosoma, ventral view
(Bristowe 1948)
Opisthosoma, lateral view
(Bristowe 1948)
Habitus, dorsal view
(Song et al. 2024)
Habitus, lateral view
(Song et al. 2024)
Eyes, dorsal view
(Bristowe 1948)
Leg I
(Bristowe 1948)
Leg I
(Locket & Millidge 1951)
Opisthosoma, lateral view
(Locket & Millidge 1951)
Scutum, ventral view
(Saaristo 2001)
Distribution List
References
Blick T, Finch O-D, Harms K H, Kiechle J, Kielhorn K-H , Kreuels M, Malten A, Martin D, Muster C, Nährig D, Platen R, Rödel I, Scheidler M, Staudt A, Stumpf H, Tolke D (2016) Rote Liste und Gesamtartenliste der Spinnen (Arachnida: Araneae) Deutschlands. 3. Fassung, Stand April 2008, einzelne Änderungen und Nachträge bis August 2015. Naturschutz und Biologische Vielfalt 70/4: 383-510 
Bristowe W S (1948) Notes on the structure and systematic position of oonopid spiders based on an examination of the British species. Proceedings of the Zoological Society of London 118: 878-891
El-Hennawy H K (2017a) A list of Egyptian spiders (revised in 2017). Serket 15: 167-183
Helsdingen P J van (2025a) Catalogus van de Nederlandse spinnen. Versie 2025.1. 249 pp.
Locket G H, Millidge A F (1951) British spiders. Vol. I. Ray Society, London, 310 pp.
Saaristo M I (2001) Dwarf hunting spiders or Oonopidae (Arachnida, Araneae) of the Seychelles. Insect Systematics & Evolution 32: 307-358
Saaristo M I (2010) Araneae. In: Gerlach J & Marusik Y M (eds.) Arachnida and Myriapoda of the Seychelles Islands. Siri Scientific Press, Manchester, pp. 8-306.
Sherwood D (2025) Annotated checklist of imported non-native spider (Araneae) taxa recorded in the United Kingdom 1800–2024. Arthropoda Selecta 34: 121-160
Song C X, Tong Y F, Bian D J, Zhang Z S (2024) Two new species and one new record of Ischnothyreus Simon, 1893 (Araneae, Oonopidae) from China. Biodiversity Data Journal 12(e122100): 1-13
Vaněk O (2023) Populace vzokana vlasatého (Ischnothyreus velox, Araneae: Oonopidae) v České republice [Population of Ischnothyreus velox (Araneae: Oonopidae) in the Czech Republic]. Pavouk 55: 3-4
WSC (2026) World Spider Catalog. Version 27. Natural History Museum Bern, online at http://wsc.nmbe.ch (13.2.2026) doi: 10.24436/2