Ephialtini

Genus Guides

17

Ephialtini is a tribe of ichneumonid wasps within the Pimplinae, comprising approximately 17 and at least 120 . Members are exclusively of spiders (Araneae), with many species belonging to the 'Polysphincta group' that attack post-embryonic spiders. These exhibit diverse specificity patterns, ranging from polyphagy across multiple spider to strict specialization on particular host species or genera. Some species parasitize spiders while others attack spider sacs.

Zatypota anomala by (c) jcowles, some rights reserved (CC BY), uploaded by jcowles. Used under a CC-BY license.Oxyrrhexis by (c) Tyler Bishop, some rights reserved (CC BY), uploaded by Tyler Bishop. Used under a CC-BY license.Ephialtini by (c) Katja Schulz, some rights reserved (CC BY). Used under a CC-BY license.

Pronunciation

How to pronounce Ephialtini: /ɛfiˈæltɪnaɪ/

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Identification

Ephialtini belongs to the Polysphincta -group within Pimplinae; genera include Acrodactyla, Clistopyga, Ephialtes, Hymenoepimecis, Oxyrrhexis, Perithous, Polysphincta, Schizopyga, Sinarachna, Tromatobia, Zatypota, and Zaglyptus. -level identification requires examination of morphological characters including wing venation, propodeal structure, and ovipositor features; has proven effective for verifying - associations and identifying specimens from consumed host remains or shed pupal cases.

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Habitat

correlate with distribution of spider ; documented from forest and meadow in the Carpathian region, Norway spruce (Picea abies) stands in the Netherlands, and various habitats across the Palaearctic, Neotropical, and Afrotropical regions.

Distribution

Widespread across multiple biogeographic regions: Palaearctic (Europe including Carpathians, Netherlands, France, Italy; Egypt), Neotropical (Brazil, Peru, Argentina), and other regions. Specific documented localities include Carpathian region (Ukraine, Romania), Netherlands (Gelderland province), France, Italy, Egypt, Brazil (Mato Grosso, Minas Gerais), Peru, and Argentina.

Host Associations

Life Cycle

Koinobiont ectoparasitoids: are laid on or in spider ; larvae develop attached to the of living, growing spiders, feeding externally while allowing host to continue development; host spider dies as subadult; larva kills and consumes host just prior to ; pupation may occur within a loose silk cocoon. Some are idiobiont of spider egg sacs.

Behavior

specificity varies considerably: some are on multiple spider , while others exhibit strict specialization on particular host or species. Some species attack spiders, while others parasitize spider sacs. In some cases, host spider is modified towards the end of the 's development, potentially to the advantage of the parasitoid. Mobile spider hosts allow parasitoid larvae to be transported to suitable sites.

Ecological Role

agents that regulate spider in various ; significant natural enemies of web-building and wandering spider . The koinobiont lifestyle allows to exploit actively foraging or web-building that would be unavailable to idiobiont parasitoids.

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