Philodromus infuscatus utus

Chamberlin, 1921

Philodromus infuscatus utus is a of running crab spider in the Philodromidae, described by Chamberlin in 1921. It belongs to the infuscatus group, which comprises 20 species and 2 subspecies distributed across North and Central America and the West Indies. This subspecies is distinguished from the nominate P. i. infuscatus by its occurrence in the western United States, whereas the nominate form occurs in the eastern United States. The infuscatus group as a whole is to the Americas with primary in arid regions of the United States and Mexico.

Pronunciation

How to pronounce Philodromus infuscatus utus: /fɪloʊˈdroʊməs ɪnˌfʌsˈkɑːtəs ˈjuːtəs/

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Identification

Philodromus infuscatus utus can be distinguished from the nominate P. i. infuscatus by geographic distribution: utus occurs in western U.S.A. while infuscatus occurs in eastern U.S.A. As a member of the infuscatus group, it shares characteristics with other group members, though specific diagnostic morphological features for this subspecies are not detailed in available sources. -level identification within Philodromus typically requires examination of genitalia and other subtle morphological characters.

Habitat

Dry in western United States, particularly in arid and semi-arid regions. The infuscatus group as a whole is associated with dry parts of the U.S.A. and Mexico.

Distribution

Western United States (specifically western U.S.A. as distinguished from eastern U.S.A. occurrence of the nominate ). Distribution records also include Canada, though the subspecies is primarily western North American.

Similar Taxa

  • Philodromus infuscatus infuscatusNominate occurring in eastern U.S.A., distinguished from P. i. utus by geographic distribution
  • Philodromus disparThe sole American representative of the dispar group, introduced from the Old World; occurs in similar but belongs to a different group
  • Other Philodromus infuscatus group speciesThe group comprises 20 and 2 ; many occur in dry regions of southwestern U.S.A. and Mexico, requiring careful examination for identification

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Sources and further reading