Nevadasilus auriannulatus

Nevadasilus auriannulatus can be distinguished from the only congeneric species, N. willistoni, by differences in body coloration and markings. The specific epithet "auriannulatus" (golden-ringed) likely refers to distinctive golden or yellowish annular markings on the abdomen or legs, though original description details should be consulted for confirmation. Within the Asilidae, Nevadasilus species are characterized by their western North American distribution and presumably robust body form typical of the family. Accurate identification requires examination of male genitalia and comparison with type specimens.

Habitat preferences are inferred from collection records and observations in the western United States. The species has been associated with arid and semi-arid environments characteristic of the Great Basin and adjacent regions. Specific microhabitat requirements remain undocumented.

Western North America, with records from the western United States. The genus Nevadasilus has a restricted range centered in the Great Basin and surrounding areas.

Adult activity period has been documented from spring through summer months based on observational records. Exact phenology varies with elevation and latitude.

Presumed to exhibit predatory behavior typical of Asilidae, including aerial hunting of other insects and perching on exposed substrates to scan for prey. Specific behavioral observations for this species have not been published.

Likely functions as a generalist aerial predator within its habitat, contributing to regulation of insect populations. Specific ecological impacts have not been quantified.

No documented economic or medical importance. Of interest to dipterists and naturalists documenting western North American biodiversity.

• Nevadasilus willistoniOnly congeneric species; distinguished by differences in coloration, markings, and male genitalia structure. N. willistoni has a broader distribution and may lack the golden annular markings implied by the N. auriannulatus epithet.
• Other Asilidae generaNumerous western North American robber fly genera share general body plan; Nevadasilus is distinguished by combination of geographic restriction, presumed specific markings, and male genitalic characters.

• robber fly
• Asilidae
• western North America
• Great Basin
• endemic genus
• aerial predator

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy