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Anelosimus oritoyacu
''Anelosimus oritoyacu'' is a species of tangle-web spider found in Ecuador and Mexico at altitudes from . It is subsocial, although it has some features which distinguish it from other social or subsocial spiders in the genus. It has long-lived nest sites, unlike the social spider Anelosimus eximius which has more transitory nest sites, and its webs do not have aerial threads found in other social and sub-social species. It has a female-biased sex ratio, which is indicative of social behavior, although its sex ratio is smaller than other social species.〔 It was first identified as distinct from Anelosimus studiosus in 2006 by Ingi Agnarsson. It is named for Oritoyacu, Ecuador, where the type specimen was collected.
== Description ==
Specific to specimens from Ecuador, males range in size between , and females between . Specimens collected in Mexico are larger. Prosoma is brown with grey marks, while legs are pale brown, with darker brown at the tips. Males can be distinguished by the size of their embolus fork and embolus division b, while females have a epigynal plate which is high relative to its width.〔
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