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Brief Summary
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The spider family Filistatidae (crevice weavers) includes 115 described species (Platnick 2013). Seven of these species occur in North America north of Mexico, including five large spiders in the genus Kukulcania (the other two are small spiders, <5 mm long) (Bradley 2013).

The common name "crevice weaver" refers to the retreat these spiders build in a crack or similar space, usually among rocks or dead wood. The spider builds a silken tube in this space then extends a circular band of hackle-banded silk (i.e., silk from the cribellum) in a circular pattern around the entrance. From this circular area the spider spins a series of long trip lines, yielding a distinctive web. Crevice weavers can often be found in and around buildings. (Bradley 2013).

The synanthropic Southern House Spider (Kukulcania hibernalis) is found in the southeastern United States (Bradley 2013), but is also widespread in South America (Brescovit and Santos 2013). It is among the most common spiders within its range in the eastern United States (Howell and Jenkins 2004). The eight eyes are tightly grouped on a central mound (Bradley 2013). This spider exhibits conspicuous sexual dimorphism. The female is dusky gray or black with a velvety covering of hairs. The legs have velvet hairs and many short spines. The male is tan with long legs and palps. These palps are often held in a folded position position, extending directly in front of the chelicerae. Markings on the male's carapace (the upper part of the cephalothorax) often result in these spiders being misidentified as Brown Recluse Spiders (Loxosceles reclusa), although Brown Recluses can be easily distinguished from Southern House Spiders by the fact that they have six eyes rather than eight eyes (Howell and Jenkins 2004; Gaddy 2009). Although the female Southern House Spider stays around her web crevice, the male roams and hunts like a wolf spider or fishing spider (Gaddy 2009).

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Crevice weaver
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The crevice weaver spiders (family Filistatidae) comprise cribellate spiders with features that have been regarded as "primitive" for araneomorph spiders. They are weavers of funnel or tube webs. The family contains 18 genera and more than 120 described species worldwide.

One of the most abundant members of this family in the Americas is the southern house spider (Kukulcania hibernalis). Named after the fierce Meso-American god Kukulkan, the females are large (up to nearly 20 mm) dark-colored spiders and males are light brown, smaller (about 10 mm), but more long-legged and with palps that are held together in front of their carapaces like the horn of a unicorn. The males also have a darker streak on the center of the dorsal carapace that causes them to be often mistaken for brown recluse spiders. The tiny members of the genus Filistatinella are like miniature versions of Kukulcania. The nominate genus Filistata is Afro-Eurasian in distribution. In many older books the species from the Americas now placed in the genus Kukulcania are placed in Filistata.

A striking visual characteristic of the family, beside dimorphism, is the unusual upward bend encountered near the femur of the first pair of legs. While resembling hydraulic muscle mechanisms akin to arthropods, this modification actually allows the spider to retain the prey directly from the crevice it occupies. Also, if the larger prey ever tries to pull it from the crevice, the spider can use these legs to "grab" to the side walls and hence make it difficult. Many Kukulcania species also use them to dig holes in the soft ground at a 25- to 30-degree angle.[citation needed]

Taxonomy

The family Filistatidae was created in 1867 by Anton Ausserer.[1] It was based on the species he called Filistata bicolor (now Filistata insidiatrix), a Mediterranean species also found in southern Austria.[3][4]

Phylogeny

On the basis of the features of the male and female genitalia, the family was placed in the Haplogynae, usually as the sister taxon of the remaining members of the group.[5] However, unlike the other haplogynes, Filistatidae are cribellate and do not show a decrease in the number of segments of the anterior lateral spinnerets.[6] They have other features which have been regarded as "primitive": an M-shaped intestine, only leg IV moving while combing silk, and posterior book lung leaves being present in early juveniles.[7] A 2013 study based on molecular evidence placed the family as sister to a clade consisting of Hypochilidae and the remaining haplogynes.[8] The precise phylogenetic position of the family was described in 2014 as "one of the most enigmatic problems in spider phylogeny".[6]

A 2015 study, based on genomic data, places Filistatidae with Hypochilidae in a clade outside most of the families previously placed in Haplogynae:[9]

.mw-parser-output table.clade{border-spacing:0;margin:0;font-size:100%;line-height:100%;border-collapse:separate;width:auto}.mw-parser-output table.clade table.clade{width:100%}.mw-parser-output table.clade td{border:0;padding:0;vertical-align:middle;text-align:center}.mw-parser-output table.clade td.clade-label{width:0.8em;border:0;padding:0 0.2em;vertical-align:bottom;text-align:center}.mw-parser-output table.clade td.clade-slabel{border:0;padding:0 0.2em;vertical-align:top;text-align:center}.mw-parser-output table.clade td.clade-bar{vertical-align:middle;text-align:left;padding:0 0.5em}.mw-parser-output table.clade td.clade-leaf{border:0;padding:0;text-align:left;vertical-align:middle}.mw-parser-output table.clade td.clade-leafR{border:0;padding:0;text-align:right} Araneomorphae      

Hypochilidae

   

Filistatidae

     

most other "traditional" haplogynes

       

Leptonetidae

   

Entelegynae

     

This placement suggests that features that were thought to be "primitive" to araneomorph spiders as a whole (such as an M-shaped midgut) could actually be novel derived features (synapomorphies) of the Hypochilidae-Filistatidae clade.[9]

Genera

As of January 2016[update], the World Spider Catalog accepted the following genera:[1]

  • Afrofilistata Benoit, 1968 – West and Central Africa
  • Andoharano Lehtinen, 1967 – Namibia, Madagascar
  • Filistata Latreille, 1810 – Macaronesia, Mediterranean through Eurasia to Japan
  • Filistatinella Gertsch & Ivie, 1936 – USA, Mexico
  • Filistatoides F. O. Pickard-Cambridge, 1899 – Cuba, Guatemala, Chile
  • Kukulcania Lehtinen, 1967 – widespread in the Americas, including Peru, Chile, Mexico, USA
  • Lihuelistata Ramírez & Grismado, 1997 – Argentina
  • Microfilistata Zonstein, 1990 – Turkmenistan, Tajikistan
  • Misionella Ramírez & Grismado, 1997 – Brazil, Argentina
  • Mystes Bristowe, 1938 – Malaysia
  • Pholcoides Roewer, 1960 – Afghanistan
  • Pikelinia Mello-Leitão, 1946 – Colombia, Galapagos Is., Brazil, Argentina
  • Pritha Lehtinen, 1967 – widespread from Macaronesia and the Mediterranean through Eurasia to China and south to New Guinea
  • Sahastata Benoit, 1968 – Mediterranean to India
  • Tricalamus Wang, 1987 – Afghanistan, China, Palau, Ogasawara Is., Okinawa
  • Wandella Gray, 1994 – Australia
  • Yardiella Gray, 1994 – Western Australia
  • Zaitunia Lehtinen, 1967 – Egypt, Israel, Iran, Afghanistan, Uzbekistan, Tajikistan, Kazakhstan

See also

References

  1. ^ a b c "Family: Filistatidae Ausserer, 1867", World Spider Catalog, Natural History Museum Bern, retrieved 2016-01-10.mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""'"'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
  2. ^ "Currently valid spider genera and species", World Spider Catalog, Natural History Museum Bern, archived from the original on November 3, 2015, retrieved 2016-01-10
  3. ^ "Taxon details Filistata insidiatrix (Forsskål, 1775)", World Spider Catalog, Natural History Museum Bern, retrieved 2016-01-10
  4. ^ Ausserer, A. (1867), "Die Arachniden Tirols nach ihrer horizontalen und verticalen Verbreitung, I", Verhandlungen der Kaiserlich-Königlichen Zoologisch-Botanischen Gesellschaft in Wien, 17: 137–170
  5. ^ Coddington, Jonathan A. (2005). "Phylogeny and classification of spiders" (PDF). In Ubick, D.; Paquin, P.; Cushing, P.E. & Roth, V. Spiders of North America: an identification manual. American Arachnological Society. pp. 18–24. Retrieved 2015-09-24.
  6. ^ a b Michalik, Peter & Ramírez, Martín J. (2014), "Evolutionary morphology of the male reproductive system, spermatozoa and seminal fluid of spiders (Araneae, Arachnida)–Current knowledge and future directions", Arthropod Structure & Development, 43 (4): 291–322, doi:10.1016/j.asd.2014.05.005, retrieved 2015-09-24
  7. ^ Ramírez, M. (2014), The morphology and phylogeny of Dionychan spiders (Araneae: Araneomorphae), Bulletin of the American Museum of Natural History (390), retrieved 2015-10-31
  8. ^ Agnarsson, Ingi; Coddington, Jonathan A. & Kuntner, Matjaž (2013), "Systematics : Progress in the study of spider diversity and evolution", in Penney, David, Spider research in the 21st century: trends & perspectives, Manchester, UK: Siri Scientific Press, ISBN 978-0-9574530-1-2
  9. ^ a b Garrison, Nicole L.; Rodriguez, Juanita; Agnarsson, Ingi; Coddington, Jonathan A.; Griswold, Charles E.; Hamilton, Christopher A.; Hedin, Marshal; Kocot, Kevin M.; Ledford, Joel M. & Bond, Jason E. (2015). "Spider phylogenomics: untangling the Spider Tree of Life". PeerJ PrePrints. 3: e1852. doi:10.7287/peerj.preprints.1482v1.
 src= Wikispecies has information related to Filistatidae  src= Wikimedia Commons has media related to Filistatidae.
Extant Araneae families
Suborder Mesothelae
Suborder Opisthothelae
Mygalomorphae AraneomorphaeNon-entelegynes Entelegynae
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Crevice weaver: Brief Summary
provided by wikipedia EN

The crevice weaver spiders (family Filistatidae) comprise cribellate spiders with features that have been regarded as "primitive" for araneomorph spiders. They are weavers of funnel or tube webs. The family contains 18 genera and more than 120 described species worldwide.

One of the most abundant members of this family in the Americas is the southern house spider (Kukulcania hibernalis). Named after the fierce Meso-American god Kukulkan, the females are large (up to nearly 20 mm) dark-colored spiders and males are light brown, smaller (about 10 mm), but more long-legged and with palps that are held together in front of their carapaces like the horn of a unicorn. The males also have a darker streak on the center of the dorsal carapace that causes them to be often mistaken for brown recluse spiders. The tiny members of the genus Filistatinella are like miniature versions of Kukulcania. The nominate genus Filistata is Afro-Eurasian in distribution. In many older books the species from the Americas now placed in the genus Kukulcania are placed in Filistata.

A striking visual characteristic of the family, beside dimorphism, is the unusual upward bend encountered near the femur of the first pair of legs. While resembling hydraulic muscle mechanisms akin to arthropods, this modification actually allows the spider to retain the prey directly from the crevice it occupies. Also, if the larger prey ever tries to pull it from the crevice, the spider can use these legs to "grab" to the side walls and hence make it difficult. Many Kukulcania species also use them to dig holes in the soft ground at a 25- to 30-degree angle.[citation needed]

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