Aptostichus hesperus (Bond, Jason E. 2012)
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Ordo: Araneae
Familia: Cyrtaucheniidae
Genus: Aptostichus
Name
Aptostichus hesperus Bond, Jason E., 2012 – Wikispecies link – Pensoft Profile
- Aptostichus hesperus Bond, Jason E., 2012, ZooKeys 252: 93-98.
Diagnosis
Diagnosis. Female (Figs 188-191) and male (Figs 192-196) Aptostichus hesperus can be distinguished from all other Aptostichus species by having posterior sternal sigilla that are positioned mid - ventrally and are either very closely positioned, or contiguous (Fig. 188). The sigilla of other Aptostichus species are distinctly separated and tend to be positioned more posteriorly. A longer palpal bulb length and greater PTw/PTl ratio (Figs 195, 196) also help to distinguish this species from Aptostichus atomarius, Aptostichus cahuilla and Aptostichus icenoglei that potentially occur sympatrically with Aptostichus hesperus. All Hesperus group taxa have an offset rastellar spine (Fig. 189).
Description
Descriptions. Described by Chamberlin (1919: 1-2).
Distribution
Distribution and natural history. Aptostichus hesperus is distributed in the Santa Ana, San Jacinto, San Bernardino Mountains, and intervening areas. County records include Orange, the western extent of Riverside, and a few localities in San Bernardino (Map 20). The primary habitat type throughout this area comprises chaparral forest and shrub, open woodland shrub, and coniferous forest. Aptostichus hesperus is particularly prevalent in chaparral habitat and is often collected from burrows at the base of large boulders and along steep inclines of north facing slopes. The DM (Map 21) corresponds well with the known distribution but indicates that Aptostichus hesperus should be more prevalent throughout open woodland shrub habitat in the southwestern extent of San Bernardino County; the species has not been collected in the areas of higher probability to the south in San Diego County. Although a few males have been recovered from pitfall traps in the spring and summer, the majority of wandering males have been collected during late fall and winter months (October-February).
Taxon Treatment
- Bond, Jason E.; 2012: Phylogenetic treatment and taxonomic revision of the trapdoor spider genus Aptostichus Simon (Araneae, Mygalomorphae, Euctenizidae) ZooKeys, 252: 93-98. doi
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