Opisthothelae

Opisthothelae

Missulena bradleyi
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Class:	Arachnida
Order:	Araneae
Suborder:	Opisthothelae Pocock, 1892^[1]
Infraorders
Araneomorphae Mygalomorphae

Opisthothelae is a taxon within Order Araneae, consisting of the Mygalomorphae and the Araneomorphae, but excluding the Mesothelae. Opisthothelae is sometimes presented as an unranked clade^[2]^[3] and sometimes as a suborder of the Araneae.^[2] In the latter case, Mygalomorphae and Araneomorphae are treated as infraorders.

The fairly recent creation of this taxon has been justified by the requirement to distinguish these spiders from the Mesothelae, which display many more primitive characteristics. Those that distinguish between Mesothelae and Opisthothelae are:

the tergite plates on the abdomen of Mesothelae but absent in Opisthothelae;
the almost total absence of ganglia in the abdomen of Opisthothelae;
the almost median position of the spinnerets in the Mesothelae compared to the hindmost position of those of the Opistothelae;

Among the Opisthothelae, the fangs of the Mygalomorphae point straight down in front of the mouth aperture and only allow the spider to grasp its prey from above and below, whereas in the Araneomorphae they face one another like pincers, allowing a firmer grip. It is difficult to distinguish araneomorphs and mygalomorphs on first inspection unless the specimens are large enough to permit immediate examination of the fangs.

References

↑ Dunlop, Jason A. & Penney, David (2011). "Order Araneae Clerck, 1757" (PDF). In Zhang, Z.-Q. Animal biodiversity: An outline of higher-level classification and survey of taxonomic richness. Zootaxa. Auckland, New Zealand: Magnolia Press. ISBN 978-1-86977-850-7. Retrieved 2015-10-31.
1 2 Scientific name: Opisthothelae in Brands, S.J. (comp.) 1989-present. The Taxonomicon. Universal Taxonomic Services, Zwaag, The Netherlands. http://taxonomicon.taxonomy.nl/. Access date: 8 December 2010
↑ Coddington, J.A. (2005). "Phylogeny and Classification of Spiders". In Ubick, D.; Paquin, P.; Cushing, P.E.; Roth, V. Spiders of North America: an identification manual (PDF). American Arachnological Society. pp. 18–24. ISBN 0-9771439-0-2. Retrieved 2008-10-12.

Wikispecies has information related to: Opisthothelae

Spiders

Arachnology	Ballooning Behavior Cannibalism Evolution Classification

Taxonomy	Araneomorphae Mesothelae Mygalomorphae Opisthothelae List of families of spiders Lists of spider species

Anatomy	Arthropod leg Book lung Calamistrum Cephalothorax Chelicerae Cheliceral fang Cribellum Epigyne Exuvia Opisthosoma Pedipalp Palpal bulb Scopulae Silk Spinneret Urticating hair

Human interaction	Arachnophobia Cultural depictions Spider bite Spider fighting

Webs	Spider web Web decorations

Category

Extant Araneae families

Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Arachnida

Suborder Mesothelae

Liphistiidae (segmented spiders)

Suborder Opisthothelae

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List of families of spiders
Spider taxonomy
List of spider common names
Bold are families with more than 1000 species

Taxon identifiers	EoL: 2580343 ITIS: 82735

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