Difference between revisions of "Aptostichus anzaborrego"

Revision as of 09:53, 20 December 2012

Taxonavigation

Ordo: Araneae
Familia: Euctenizidae
Genus: Aptostichus

Name

Aptostichus anzaborrego Bond, 2012 sp. n. – Wikispecies link – Anza-Borrego Desert State Park Trapdoor Spider’ ZooBank link – Pensoft Profile

Types

Male holotype and male paratypes (AP1199) from California, San Diego County, Anza-Borrego Desert State Park, Indian Gorge, ~4.8km W of Hwy S-2, just W of Torote Canyon, 32.8685, -116.23801, 351m, coll. M. Hedin 27-29.xi.2002; deposited in AUMNH.

Etymology

The specific epithet is a noun taken in apposition from the type locality, Anza-Borrego Desert State Park.

Diagnosis

Males can be diagnosed on the basis of a unique conformation of the retrolateral distal-most spination pattern of tibia I, which comprises 8-10 short overlapping spines (Fig. 263). This spination pattern is most similar to Aptostichus cahuilla, however Aptostichus anzaborrego males are lighter in coloration, have very light dorsal abdominal markings (Fig. 262), and have numerous spines on the prolateral surface tibia and patella I (Fig. 264).

Description of male holotype

Specimen preparation and condition. Specimen collected live, wandering, preserved in 80% EtOH. Coloration and specimen in relatively good condition. Pedipalp, leg I left side removed, stored in vial with specimen. General coloration. Carapace, chelicerae, strong brown 7.5YR 4/6. Abdomen brown 7.5YR 5/4, light dorsal markings (Fig. 262). Cephalothorax. Carapace 5.15 long, 4.50 wide, very lightly hirsute with intermingled thin white, black setae; stout black bristles along fringe; surface smooth, pars cephalica elevated. Fringe, posterior margin with black bristles. Foveal groove deep, straight. Eyes elevated on high mound. AER slightly procurved, PER strongly recurved. PME, AME subequal diameter. Sternum moderately setose, STRl 3.00, STRw 2.50. Posterior sternal sigilla small in size, positioned towards margin, not contiguous, anterior sigilla pairs small, oval, marginal. Chelicerae with distinct anterior tooth row comprising 6 teeth, posterior margin with patch of small denticles. Palpal endites with patch of small cuspules on proximal, inner margin, labium with 2 cuspules, LBw 0.87, LBl 0.44. Rastellum consists of 7 stout spines not on prominent mound, two spines offset prolaterally. Abdomen. Setose, heavy black setae intermingled with fine black setae. Legs. Leg I: 5.45, 3.90, 3.68, 2.26, 1.75; leg IV: 5.10, 2.60. Tarsus I, swollen distally, tarsus IV straight. Light tarsal scopulae on all legs, light scopulae on metatarsus I, II. Tarsus I with single, slightly staggered row of 15 trichobothria. Leg I spination pattern illustrated in Figures 263, 264; TSp 9, TSr 7, TSrd 7. Pedipalp. Articles slender, lacking distinct spines (Fig. 265). PTw 1.04, PTl 2.48, Bl 1.29. Embolus slender, tapering sharply toward tip, lacking serrations (Fig. 265).
Variation (2). Cl 4.88-5.15, Cw 4.24-4.50, STRl 2.88-3.00, STRw 2.38-2.50, LBw 0.85-0.87, LBl 0.44-0.51, leg I: 4.75-5.45, 3.41-3.9, 3.26-3.68, 2.08-2.26, 1.55-1.75; leg IV: 4.60-5.10, 2.17-2.60; PTl 2.17-2.48, PTw 1.02-1.04, Bl 1.19-1.29, TSp 5-9, TSr 2-7, TSrd 7-9.

Description of female

Known only from male specimens.

Material examined

Known only from the type material.

Distribution and natural history

Aptostichus anzaborrego is known from only two specimens from the Anza-Borrego Desert State Park, Colorado Desert habitat, in San Diego County. Based on the limited data available males appear to disperse during the winter months (November).

Conservation status

The conservation status of Aptostichus anzaborrego is likely imperiled given its very restricted distribution and rarity in collections.

Species concept applied

Morphological.

Original Description

• Bond, J; 2012: Phylogenetic treatment and taxonomic revision of the trapdoor spider genus Aptostichus Simon (Araneae, Mygalomorphae, Euctenizidae) ZooKeys, 252: 1-209. doi

Images

Maps 30, 31. Aptostichus sinnombre sp. n., Aptostichus anzaborrego sp. n., Aptostichus mikeradtkei sp. n. 30 known distributions 31 predicted distribution of Aptostichus mikeradtkei; cooler colors–blue shades–represent areas of high probability of occurrence, warmer colors–yellow and orange shades–represent areas of low probability of occurrence.  Figures 262–265. Aptostichus anzaborrego sp. n., male holotype from San Diego County (AP1199); scale bars = 1.0mm. 262 habitus [806106] 263 retrolateral aspect, leg I [806102] 264 prolateral aspect, leg I [806098] 265 retrolateral aspect, pedipalp [806104].