Ebo evansae

Sauer & Platnick, 1972

Evans's Running Crab Spider

Ebo evansae is a of running crab spider in the Philodromidae. The Ebo is characterized by extremely elongated second legs that are at least twice the length of the other legs, giving these small spiders the greatest relative leg span for their body size among North American spiders. Body length ranges from 2–6 mm depending on species. The genus name derives from a medieval German diminutive meaning 'prince' or 'lord'. Ebo evansae occurs in the United States and Mexico.

Pronunciation

How to pronounce Ebo evansae: /ˈiːboʊ ˈɛvənseɪ/

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Identification

Members of the Ebo are distinguished from other running crab spiders ( Philodromidae) by their extraordinarily elongated second pair of legs, which are at least twice as long as all other legs. This gives them the greatest 'wingspan' relative to body size of any North American spider. Body size is small, typically 2–6 mm. The second leg pair is used for identification; no other philodromid genus exhibits this extreme leg disproportion. -level identification within Ebo requires examination of genitalia and other subtle morphological features.

Habitat

Ebo prowl for prey among grasses and foliage. At least two Ebo species have been documented in pecan groves in Texas, suggesting affinity for arboreal or shrubby vegetation in agricultural settings.

Distribution

United States and Mexico. The Ebo reaches its greatest diversity in the southwestern United States.

Behavior

Running crab spiders are active hunters that prowl vegetation rather than building webs to capture prey. The elongated second legs likely aid in spanning gaps between grass blades or foliage while hunting.

Ecological Role

in grassland and shrub vegetation. At least two Ebo contribute minor natural pest control in pecan groves.

Human Relevance

Minor potential as agent in pecan agriculture; otherwise negligible direct human impact.

Similar Taxa

TitaneboFormerly considered part of Ebo; some North American were reassigned to this . Requires careful examination of morphological characters to distinguish.
Other Philodromidae generaAll other running crab spiders have less extreme leg proportions; second leg pair is not dramatically elongated relative to other legs.

More Details

Taxonomic note

The Ebo formerly contained 22 North American , but recent taxonomic revisions reassigned many to the genus Titanebo, leaving seven species in Ebo sensu stricto in North America.

Etymology

The name Ebo derives from a medieval German diminutive of 'Ebur,' meaning 'prince' or 'lord'; the etymologist Eugen von Keyserling provided no explicit indication of his intent in naming the genus.