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Latrodectus variolus : ウィキペディア英語版
Latrodectus variolus

''Latrodectus variolus'', the Northern black widow spider or Northern widow, is a medically important spider species of the Latrodectus genus in the Theridiidae family. The population is closely related to the Southern Black Widow, ''Latrodectus mactans'', and the Western Black Widow, ''Latrodectus hesperus'', of the genus.
It is commonly found in Middle Atlantic states (New Jersey, Delaware, Maryland). During the April–May mating season, it can travel north along the coast as far as Massachusetts. It also occurs in Connecticut in late summer. It is found, rarely, in southern Ontario, Canada.
A bite may cause latrodectism, and requires medical attention in the case of increasingly severe discomfort or spreading local redness accompanied by severe pain.〔(CalPoison.org )〕 The LD-50 has been measured in mice as ; each spider contains about of venom.
Unlike for the related ''Latrodectus mactans'', no antivenin was available.
==References==

*Platnick, N. I. 2008. (Theridiidae ) The World Spider Catalog, version 9.0. American Museum of Natural History.

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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