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Agelenidae
The Agelenidae are a large family of spiders in the suborder Araneomorphae. Well-known examples include the common "grass spiders" of the genus ''Agelenopsis''. Nearly all Agelenidae are harmless to humans, but the bite of the "hobo spider" (''Eratigena agrestis'') may be medically significant and there is evidence that it might cause necrotic lesions. The matter however remains subject to debate.〔Gaver-Wainwright, Melissa M.; Zack, Richard S.; Foradori, Matthew J.; Lavine, Laura Corley. Misdiagnosis of Spider Bites: Bacterial Associates, Mechanical Pathogen Transfer, and Hemolytic Potential of Venom from the Hobo Spider, Eratigena agrestis (Araneae: Agelenidae). Journal of Medical Entomology 48(2):382-388. 2011 doi: http://dx.doi.org/10.1603/ME09224〕 The most widely accepted common name for members of the family is "Funnel weaver".〔() Breene et al., 2003. Common Names of Arachnids, fifth edition〕
==Description==
The smallest species of the Agelenidae are about 4 mm in bodily length, excluding leg span. Fairly large species are about 20 mm in length. Some exceptionally large species, for example ''Eratigena atrica'', may reach 5 cm to 10 cm in total leg span.
Agelenidae have eight eyes in two horizontal rows of four. The cephalothorax narrows somewhat towards the front where the eyes are. The abdomen is more or less oval, usually patterned with two rows of lines and spots. Some species have longitudinal lines on the dorsal surface of the cephalothorax whereas other species do not; for example, the hobo spider does not, which assists in informally distinguishing it from similar-looking species.〔Vetter, R. S., and A. L. Antonelli. 2002. How to identify (or misidentify) the hobo spider. Wash. St. Coop. Ext. Pest Leafl. Series No. 116〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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