Habronattus amicus

(G. W. Peckham & E. G. Peckham, 1909)

Habronattus amicus is a small jumping spider ( Salticidae) found in the western United States and parts of western Canada. It belongs to the -rich Habronattus, which is particularly diverse in southwestern North America. The species has been the subject of phylogeographic research revealing complex evolutionary dynamics, including localized mitochondrial with syntopic species such as H. ustulatus in dune systems of south-central Oregon. Like other members of its genus, it is a ground-dwelling, visually-oriented .

Habronattus amicus spiderlings (Marshal Hedin) by Marshal Hedin. Used under a CC BY-SA 2.5 license.

Kaldari Habronattus amicus female 02 by Ryan Kaldari. Used under a CC0 license.

Habronattus amicus 5118482 by Marshal Hedin. Used under a CC BY-SA 4.0 license.

Pronunciation

How to pronounce Habronattus amicus: /hæbrəˈnætəs əˈmaɪkəs/

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Identification

Morphologically distinguished from syntopic H. ustulatus through multivariate analyses, though small H. amicus females overlap in size with large H. ustulatus males. As with other Habronattus , males likely possess species-specific visual signals involving leg ornamentation and coloration used in , though specific characters for H. amicus are not detailed in available sources.

Images

Habitat

Dune systems in south-central Oregon have been documented as , where it occupies different microhabitats than H. ustulatus at most sites; microhabitat distinction breaks down at Summer Lake, Oregon. As a ground-dwelling Habronattus , it likely occurs in areas of scattered vegetation, stones, and leaf litter typical of the .

Distribution

Western North America: western United States and parts of western Canada including Alberta and Manitoba. Specifically documented from dune systems in south-central Oregon.

Behavior

Males of the Habronattus perform elaborate multimodal combining visual signals (leg movements, coloration displays) with vibratory drumming on the substrate. H. amicus specifically has been observed in syntopy with H. ustulatus, with which it may interact ecologically and genetically.

Ecological Role

in ground-dwelling of arid western . Documented presence influences anti-predator adaptations in other insects, including predator mimicry by bee flies in the Epacmus ( Bombyliidae), which display -like markings resembling those of Habronattus jumping spiders.

Similar Taxa

Habronattus ustulatusOccurs in syntopy on dune systems in south-central Oregon; distinguished by multivariate but with size overlap between small H. amicus females and large H. ustulatus males; mitochondrial from H. amicus into H. ustulatus documented at Summer Lake.

More Details

Mitochondrial introgression

Phylogeographic study reveals asymmetric mitochondrial from H. amicus into H. ustulatus at Summer Lake, Oregon, where microhabitat partitioning breaks down. This complicates delimitation based on mitochondrial data alone.

Taxonomic status

The 'Habronattus amicus ' includes at least three ; H. amicus itself does not form a based on mitochondrial gene trees, reflecting complex evolutionary history involving hybridization.