Psilochorus hesperus

Gertsch & Ivie, 1936

Northwestern Cellar Spider

Psilochorus hesperus is a cellar spider in the Pholcidae, native to the Pacific Northwest. It is distinguished from by the presence of curved, forward-projecting spikes on the jaws of males. The inhabits dark, sheltered microhabitats including cellars and rock crevices.

Pronunciation

How to pronounce Psilochorus hesperus: /ˌsaɪloʊˈkoʊrəs ˈhɛspərəs/

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Identification

males can be identified by the diagnostic curved, anteriorly directed spikes on the . This trait distinguishes P. hesperus from other Psilochorus . Females lack this feature and may require examination of genitalic structures or geographic context for reliable identification.

Appearance

males possess curved spikes protruding forward from the (jaws). General body plan consistent with Pholcidae: small to medium-sized spiders with extremely long, slender legs relative to body size, and a cylindrical .

Habitat

Dark, humid, sheltered environments including cellars and rock boulder crevices. Occupies anthropogenic structures (cellars) and natural rocky substrates.

Distribution

Northwestern United States and British Columbia, Canada. Specific range boundaries within this region are not documented in available sources.

Human Relevance

Presence in cellars indicates tendency; no documented medical or economic significance.

Similar Taxa

  • Other Psilochorus speciesLack curved cheliceral spikes in males; may require microscopic examination for definitive separation.

More Details

Taxonomic authority

Described by Gertsch & Ivie in 1936.

Sources and further reading