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The '''hobo spider''' ('''''Eratigena agrestis''''', formerly '''''Tegenaria agrestis''''') is a member of the family of [[spider]]s known colloquially as [[Agelenidae|funnel web spiders]], but not to be confused with the [[Australian funnel-web spider]]. Individuals construct a [[funnel]]-shaped structure of silk sheeting and lie in wait at the small end of the funnel for prey insects to blunder onto their webs. Hobo spiders sometimes build their webs in or around human habitations. The hobo spider lays its eggs in September and they hatch during late spring. After the male hobo spider mates it dies.<ref>{{Cite journal|last=Davis|first=Ryan|date=February 2016|title=Utah Pests Fact sheet|url=https://utahpests.usu.edu/uppdl/files-ou/factsheet/Hobo%20Spider.pdf|journal=Hobo Spider Eratigena Agrstis|via=Utah University}}</ref>
The '''hobo spider''' ('''''Eratigena agrestis''''', formerly '''''Tegenaria agrestis''''') is a member of the family of [[spider]]s known colloquially as [[Agelenidae|funnel web spiders]], but not to be confused with the [[Australian funnel-web spider]]. Individuals construct a [[funnel]]-shaped structure of silk sheeting and lie in wait at the small end of the funnel for prey insects to blunder onto their webs. Hobo spiders sometimes build their webs in or around human habitations. Despite past claims, there is no clear evidence that the hobo spider has venom that is dangerous to humans.<ref name="Crawford" /><ref name="CDC" /><ref name="CFP" />


== Taxonomy ==
== Taxonomy ==
Line 27: Line 27:


==Identification==
==Identification==
Spiders, including the hobo spider, vary considerably in appearance, and identification can be difficult. The hobo spider is 7–14&nbsp;mm in body length, and brownish in color.<ref name="ucr">{{cite web | title=Bites and stings of medically important venomous arthropods | publisher=Department of Entomology, University of California-Riverside| date=5 February 2001 | vauthors=Vetter RS, Visscher PK|url=http://spiders.ucr.edu/dermatol.html | archive-url=https://web.archive.org/web/20010205015700/http://spiders.ucr.edu/dermatol.html | archive-date=5 February 2001 | url-status=dead | access-date=15 January 2019}}</ref> Identification relies on an examination of the [[Spider anatomy|spider’s anatomy]]. Like many species of spider the positive identification of ''Eratigena agrestis'' requires microscopic examination of the [[epigyne|epigynum]] and [[palpal bulb]] (the female and male sex organs respectively) and is best done by an [[Arachnology|arachnologist]]. However, the following characteristics identify hobo spiders among other species with a similar general appearance:
Spiders, including the hobo spider, vary considerably in appearance, and identification can be difficult. The hobo spider is 7–14&nbsp;mm in body length, and brownish in color.<ref name="ucr">{{cite web | title=Bites and stings of medically important venomous arthropods | publisher=Department of Entomology, University of California-Riverside| date=5 February 2001 | vauthors=Vetter RS, Visscher PK|url=http://spiders.ucr.edu/dermatol.html | archive-url=https://web.archive.org/web/20010205015700/http://spiders.ucr.edu/dermatol.html | archive-date=5 February 2001 | access-date=15 January 2019}}</ref> Identification relies on an examination of the [[Spider anatomy|spider's anatomy]]. Like many species of spider the positive identification of ''Eratigena agrestis'' requires microscopic examination of the [[epigyne|epigynum]] and [[palpal bulb]] (the female and male sex organs respectively) and is best done by an [[Arachnology|arachnologist]]. However, the following characteristics identify hobo spiders among other species with a similar general appearance:


* Hobo spiders lack the colored bands found on many spiders of the family [[Agelenidae]] where the leg joints meet.<ref name="pep.wsu.edu">{{cite web |last1=Vetter |first1=R. |last2=Antonelli |first2=A. |url=http://pep.wsu.edu/wp-content/uploads/sites/7/2015/05/PLS116_1.pdf |archive-url=https://web.archive.org/web/20160807100617/http://pep.wsu.edu/wp-content/uploads/sites/7/2015/05/PLS116_1.pdf |url-status=dead |archive-date=2016-08-07 |title=How to identify (or misidentify) the hobo spider}}</ref>
* Hobo spiders lack the colored bands found on many spiders of the family [[Agelenidae]] where the leg joints meet.<ref name="pep.wsu.edu">{{cite web |last1=Vetter |first1=R. |last2=Antonelli |first2=A. |url=http://pep.wsu.edu/wp-content/uploads/sites/7/2015/05/PLS116_1.pdf |archive-url=https://web.archive.org/web/20160807100617/http://pep.wsu.edu/wp-content/uploads/sites/7/2015/05/PLS116_1.pdf |archive-date=2016-08-07 |title=How to identify (or misidentify) the hobo spider}}</ref>
* The abdomen has chevron (V-shaped) patterns (possibly many of them) down the middle, with the chevrons pointing towards the head.<ref name=ucr/>
* The abdomen has chevron (V-shaped) patterns (possibly many of them) down the middle, with the chevrons pointing towards the head.<ref name=ucr/>
* Hobo spiders have a light stripe running down the middle of the sternum. If the spider instead has three or four pairs of light spots on the lateral portions of the sternum, then it is one of the other two related ''Eratigena'' species. However absence of spots is not conclusive proof that the spider is a hobo spider, since the spots on other ''Eratigena'' species may be extremely faint and not readily visible.<ref name="pep.wsu.edu"/>
* Hobo spiders have a light stripe running down the middle of the sternum. If the spider instead has three or four pairs of light spots on the lateral portions of the sternum, then it is one of the other two related ''Eratigena'' species. However absence of spots is not conclusive proof that the spider is a hobo spider, since the spots on other ''Eratigena'' species may be extremely faint and not readily visible.<ref name="pep.wsu.edu"/>
* Hobo spiders do not have two distinct longitudinal dark stripes on the top side of the [[cephalothorax]], instead showing indistinct or diffused patterns. Washington spiders with distinct dark stripes include spiders from the genera ''Agelenopsis'' and ''Hololena'' and possibly some [[wolf spiders]].<ref name="pep.wsu.edu"/>
* Hobo spiders do not have two distinct longitudinal dark stripes on the top side of the [[cephalothorax]], instead showing indistinct or diffused patterns. Washington spiders with distinct dark stripes include spiders from the genera ''Agelenopsis'' and ''Hololena'' and possibly some [[wolf spider]]s.<ref name="pep.wsu.edu"/>


== Distribution and habitat ==
== Distribution and habitat ==


''Eratigena agrestis'' is distributed from Europe to Central Asia, and is also found in western North America, in the [[Pacific Northwest]] and [[Great Basin]].<ref name=WSC_s668/> It is recorded in the checklist of Danish spider species,<ref>{{cite web |title=Checklist of Danish Spiders (Araneae) |date=26 October 2011 |url=http://www.zmuc.dk/EntoWeb/arachnology/dkchecklist.htm}}</ref> and is present on the small island of [[Peberholm]], probably having been carried there by foreign trains.{{citation needed|date=January 2016}}
''Eratigena agrestis'' is distributed from Europe to Central Asia, and is also found in western North America, in the [[Pacific Northwest]] and [[Great Basin]].<ref name=WSC_s668/> It is recorded in the checklist of Danish spider species,<ref>{{cite web |title=Checklist of Danish Spiders (Araneae) |date=26 October 2011 |url=http://www.zmuc.dk/EntoWeb/arachnology/dkchecklist.htm |access-date=14 March 2014 |archive-date=4 March 2016 |archive-url=https://web.archive.org/web/20160304024828/http://www.zmuc.dk/EntoWeb/arachnology/dkchecklist.htm |url-status=dead }}</ref> and is present on the small [[artificial island]] of [[Peberholm]], probably having been carried there by trains.{{citation needed|date=January 2016}}


It is a resident of fields, avoiding human habitations occupied by major competitors, particularly the [[giant house spider]] (''Eratigena atrica''), which is a common resident of houses and other man-made structures in Europe. As a result, human contacts with the hobo spider are uncommon in Europe.<ref>''Dermatology E-Book'' {{ISBN|978-0-723-43571-6}} p. 1448</ref> Hobo spiders build a horizontal, [[trampoline]]-like web near brick walls or wood piles where the spider has shelter and awaits prey.<ref name=ucr/>
It is a resident of fields, avoiding human habitations occupied by major competitors, particularly the [[giant house spider]] (''Eratigena atrica''), which is a common resident of houses and other man-made structures in Europe. As a result, human contacts with the hobo spider are uncommon in Europe.<ref>''Dermatology E-Book'' {{ISBN|978-0-723-43571-6}} p. 1448</ref> Hobo spiders build a horizontal, [[trampoline]]-like web near brick walls or wood piles where the spider has shelter and awaits prey.<ref name=ucr/>

The hobo spider lays its eggs in September and they hatch during late spring. After the male hobo spider mates it dies.<ref>{{Cite web |last=Davis|first=Ryan S |date=February 2016|title=Utah Pests Fact Sheet: Hobo Spider ''Eratigena agrestis'' |url=https://utahpests.usu.edu/uppdl/files-ou/factsheet/Hobo%20Spider.pdf |archive-url=https://web.archive.org/web/20201028205049/https://utahpests.usu.edu/uppdl/files-ou/factsheet/Hobo%20Spider.pdf |archive-date=2020-10-28 |website=Utah State University}}</ref>


==Bite effects==
==Bite effects==


Although the toxicity and aggression of the hobo spider have long been debated, there is little evidence that the hobo spider is a dangerously venomous species.<ref>{{cite web |first=Rodney L |last=Crawford |url=http://www.washington.edu/burkemuseum/spidermyth/myths/hobo.html |date=27 October 2015 |title=Myths about "dangerous" spiders |publisher=Burke Museum, University of Washington |access-date=22 May 2007 |archive-url=https://web.archive.org/web/20110606030646/http://www.washington.edu/burkemuseum/spidermyth/myths/hobo.html |archive-date=6 June 2011 |url-status=dead }}</ref> The [[Centers for Disease Control and Prevention|CDC]] reported [[case report|case studies]] in the 1990s claiming that the hobo spider bite caused isolated cases of [[necrosis]] in people,<ref>{{cite web|url=http://www.fs.fed.us/r1/fire/nrcg/Committees/Operations/ims/ims_web_site/Hobo%20Spider.htm|title= Hobo Spider: Natural History|first=Rodney L |last=Crawford|publisher=Burke Museum, University of Washington}}</ref><ref name="cdc_necrosis">{{cite web|publisher=US Centers for Disease Control and Prevention|url=https://www.cdc.gov/mmwr/preview/mmwrhtml/00042059.htm|title= Necrotic arachnidism- Pacific Northwest, 1988-1996|date=1996}}</ref> but as of 2017, the CDC no longer lists the hobo spider among venomous species.<ref>{{cite web|title=Venomous spiders|url=https://www.cdc.gov/niosh/topics/spiders/types.html|publisher=US Centers for Disease Control and Prevention|date=31 May 2018|access-date=7 May 2017}}</ref> In Canada, there is no evidence that hobo spider bites cause skin necrosis.<ref>{{cite journal |last1=Bennett |first1=R.G. |last2=Vetter |first2=R.S. |title=An approach to spider bites. Erroneous attribution of dermonecrotic lesions to brown recluse or hobo spider bites in Canada |journal=Canadian Family Physician |volume=50 |pages=1098–1101 |date=August 2004 |pmid=15455808 |pmc=2214648 |url=http://www.cfp.ca/cgi/pmidlookup?view=long&pmid=15455808}}</ref> Some bites reportedly from the closely related desert grass spider, ''[[Agelenopsis aperta]],'' may have been inaccurately reported and may have actually been from the hobo spider.<ref>{{Cite journal|last=Vetter|first=Richard S|date=December 1998|title=Envenomation by a spider, Agelenopsis aperta (Family: Agelenidae) Previously Considered Harmless|url=http://dx.doi.org/10.1016/s0196-0644(98)70076-9|journal=Annals of Emergency Medicine|volume=32|issue=6|pages=739–741|doi=10.1016/s0196-0644(98)70076-9|pmid=9832673|issn=0196-0644}}</ref>
Although the toxicity and aggression of the hobo spider have long been debated, there is little evidence that the hobo spider is a dangerously venomous species.<ref name="Crawford">{{cite web |first=Rodney L |last=Crawford |url=http://www.washington.edu/burkemuseum/spidermyth/myths/hobo.html |date=27 October 2015 |title=Myths about "dangerous" spiders |publisher=Burke Museum, University of Washington |access-date=22 May 2007 |archive-url=https://web.archive.org/web/20110606030646/http://www.washington.edu/burkemuseum/spidermyth/myths/hobo.html |archive-date=6 June 2011 }}</ref> The [[Centers for Disease Control and Prevention|CDC]] reported [[case report|case studies]] in the 1990s claiming that the hobo spider bite caused isolated cases of [[necrosis]] in people,<ref>{{cite web|url=http://www.fs.fed.us/r1/fire/nrcg/Committees/Operations/ims/ims_web_site/Hobo%20Spider.htm|title= Hobo Spider: Natural History|first=Rodney L |last=Crawford|publisher=Burke Museum, University of Washington}}</ref><ref name="cdc_necrosis">{{cite web|publisher=US Centers for Disease Control and Prevention|url=https://www.cdc.gov/mmwr/preview/mmwrhtml/00042059.htm|title= Necrotic arachnidism- Pacific Northwest, 1988-1996|date=1996}}</ref> but as of 2017, the CDC no longer lists the hobo spider among venomous species.<ref name="CDC">{{cite web|title=Venomous spiders|url=https://www.cdc.gov/niosh/topics/spiders/types.html|publisher=US Centers for Disease Control and Prevention|date=31 May 2018|access-date=7 May 2017}}</ref> In Canada, there is no evidence that hobo spider bites cause skin necrosis.<ref name="CFP">{{cite journal |last1=Bennett |first1=R.G. |last2=Vetter |first2=R.S. |title=An approach to spider bites. Erroneous attribution of dermonecrotic lesions to brown recluse or hobo spider bites in Canada |journal=Canadian Family Physician |volume=50 |pages=1098–1101 |date=August 2004 |pmid=15455808 |pmc=2214648 |url=http://www.cfp.ca/cgi/pmidlookup?view=long&pmid=15455808}}</ref> Some bites reportedly from the closely related desert grass spider, ''[[Agelenopsis aperta]],'' may have been inaccurately reported and may have actually been from the hobo spider.<ref>{{Cite journal|last=Vetter|first=Richard S|date=December 1998|title=Envenomation by a spider, Agelenopsis aperta (Family: Agelenidae) Previously Considered Harmless|journal=Annals of Emergency Medicine|volume=32|issue=6|pages=739–741|doi=10.1016/s0196-0644(98)70076-9|pmid=9832673|issn=0196-0644}}</ref>


==References==
==References==

Latest revision as of 21:25, 26 August 2024

Hobo spider
Female hobo spider
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Arachnida
Order: Araneae
Infraorder: Araneomorphae
Family: Agelenidae
Genus: Eratigena
Species:
E. agrestis
Binomial name
Eratigena agrestis
Distribution in North America in green
Synonyms[1]
  • Aranea agrestis Walckenaer, 1802
  • Tegenaria agrestis (Walckenaer, 1841)
  • Philoica agrestis (Karsch, 1873)
  • Tegenaria rhaetica Thorell, 1875
  • Tegenaria magnacava Exline, 1936
  • Tegenaria osellai Brignoli, 1971
  • Tegenaria trinacriae Brignoli, 1971

The hobo spider (Eratigena agrestis, formerly Tegenaria agrestis) is a member of the family of spiders known colloquially as funnel web spiders, but not to be confused with the Australian funnel-web spider. Individuals construct a funnel-shaped structure of silk sheeting and lie in wait at the small end of the funnel for prey insects to blunder onto their webs. Hobo spiders sometimes build their webs in or around human habitations. Despite past claims, there is no clear evidence that the hobo spider has venom that is dangerous to humans.[2][3][4]

Taxonomy

[edit]

The species was first described in 1802 by naturalist Charles Athanase Walckenaer as Aranea agrestis,[1] in reference to its western European habitat in fields, woods, and under rocks.[5] In 1841, Walckenaer transferred the species to the genus Tegenaria.[1] In 2013, Tegenaria was split up, and the hobo spider was transferred to a new genus Eratigena, an anagram of Tegenaria.[1][6]

Identification

[edit]

Spiders, including the hobo spider, vary considerably in appearance, and identification can be difficult. The hobo spider is 7–14 mm in body length, and brownish in color.[7] Identification relies on an examination of the spider's anatomy. Like many species of spider the positive identification of Eratigena agrestis requires microscopic examination of the epigynum and palpal bulb (the female and male sex organs respectively) and is best done by an arachnologist. However, the following characteristics identify hobo spiders among other species with a similar general appearance:

  • Hobo spiders lack the colored bands found on many spiders of the family Agelenidae where the leg joints meet.[8]
  • The abdomen has chevron (V-shaped) patterns (possibly many of them) down the middle, with the chevrons pointing towards the head.[7]
  • Hobo spiders have a light stripe running down the middle of the sternum. If the spider instead has three or four pairs of light spots on the lateral portions of the sternum, then it is one of the other two related Eratigena species. However absence of spots is not conclusive proof that the spider is a hobo spider, since the spots on other Eratigena species may be extremely faint and not readily visible.[8]
  • Hobo spiders do not have two distinct longitudinal dark stripes on the top side of the cephalothorax, instead showing indistinct or diffused patterns. Washington spiders with distinct dark stripes include spiders from the genera Agelenopsis and Hololena and possibly some wolf spiders.[8]

Distribution and habitat

[edit]

Eratigena agrestis is distributed from Europe to Central Asia, and is also found in western North America, in the Pacific Northwest and Great Basin.[1] It is recorded in the checklist of Danish spider species,[9] and is present on the small artificial island of Peberholm, probably having been carried there by trains.[citation needed]

It is a resident of fields, avoiding human habitations occupied by major competitors, particularly the giant house spider (Eratigena atrica), which is a common resident of houses and other man-made structures in Europe. As a result, human contacts with the hobo spider are uncommon in Europe.[10] Hobo spiders build a horizontal, trampoline-like web near brick walls or wood piles where the spider has shelter and awaits prey.[7]

The hobo spider lays its eggs in September and they hatch during late spring. After the male hobo spider mates it dies.[11]

Bite effects

[edit]

Although the toxicity and aggression of the hobo spider have long been debated, there is little evidence that the hobo spider is a dangerously venomous species.[2] The CDC reported case studies in the 1990s claiming that the hobo spider bite caused isolated cases of necrosis in people,[12][13] but as of 2017, the CDC no longer lists the hobo spider among venomous species.[3] In Canada, there is no evidence that hobo spider bites cause skin necrosis.[4] Some bites reportedly from the closely related desert grass spider, Agelenopsis aperta, may have been inaccurately reported and may have actually been from the hobo spider.[14]

References

[edit]
  1. ^ a b c d e f "Taxon details Eratigena agrestis (Walckenaer, 1802)", World Spider Catalog, Natural History Museum Bern, retrieved 2016-01-03
  2. ^ a b Crawford, Rodney L (27 October 2015). "Myths about "dangerous" spiders". Burke Museum, University of Washington. Archived from the original on 6 June 2011. Retrieved 22 May 2007.
  3. ^ a b "Venomous spiders". US Centers for Disease Control and Prevention. 31 May 2018. Retrieved 7 May 2017.
  4. ^ a b Bennett, R.G.; Vetter, R.S. (August 2004). "An approach to spider bites. Erroneous attribution of dermonecrotic lesions to brown recluse or hobo spider bites in Canada". Canadian Family Physician. 50: 1098–1101. PMC 2214648. PMID 15455808.
  5. ^ Faune Parisienne, vol. 2, p. 187
  6. ^ Bolzern, Angelo; Burckhardt, Daniel; Hänggi, Ambros (2013). "Phylogeny and taxonomy of European funnel-web spiders of the Tegenaria-Malthonica complex (Araneae: Agelenidae) based upon morphological and molecular data". Zoological Journal of the Linnean Society. 168: 723–848. doi:10.1111/zoj.12040.
  7. ^ a b c Vetter RS, Visscher PK (5 February 2001). "Bites and stings of medically important venomous arthropods". Department of Entomology, University of California-Riverside. Archived from the original on 5 February 2001. Retrieved 15 January 2019.
  8. ^ a b c Vetter, R.; Antonelli, A. "How to identify (or misidentify) the hobo spider" (PDF). Archived from the original (PDF) on 2016-08-07.
  9. ^ "Checklist of Danish Spiders (Araneae)". 26 October 2011. Archived from the original on 4 March 2016. Retrieved 14 March 2014.
  10. ^ Dermatology E-Book ISBN 978-0-723-43571-6 p. 1448
  11. ^ Davis, Ryan S (February 2016). "Utah Pests Fact Sheet: Hobo Spider Eratigena agrestis" (PDF). Utah State University. Archived from the original (PDF) on 2020-10-28.
  12. ^ Crawford, Rodney L. "Hobo Spider: Natural History". Burke Museum, University of Washington.
  13. ^ "Necrotic arachnidism- Pacific Northwest, 1988-1996". US Centers for Disease Control and Prevention. 1996.
  14. ^ Vetter, Richard S (December 1998). "Envenomation by a spider, Agelenopsis aperta (Family: Agelenidae) Previously Considered Harmless". Annals of Emergency Medicine. 32 (6): 739–741. doi:10.1016/s0196-0644(98)70076-9. ISSN 0196-0644. PMID 9832673.

Bibliography

[edit]
Wikimedia Commons has media related to Tegenaria agrestis.
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