Aptostichus derhamgiulianii Bond 2012

Specimen preparation and condition. Specimen presumed to have been collected from a pitfall trap, preserved in 70% EtOH. Coloration likely faded. Pedipalp, leg I left side removed, stored in vial with specimen. General coloration. Carapace, chelicerae, legs strong brown 7.5YR 4/6. Abdomen uniform light yellowish brown 10YR 6/4; dusky dorsal chevron marking (Fig. 243). Cephalothorax. Carapace 4.05 long, 3.41 wide, glabrous posteriorly, fine white setae anteriorly, stout black bristles along fringe posterior half; surface smooth, pars cephalica elevated. Fringe, posterior margin with black bristles. Foveal groove deep, slightly procurved. Eyes on low mound. AER slightly procurved, PER slightly recurved. PME’s much smaller in diameter than AME’s. Sternum moderately setose, STRl 2.31, STRw 2.04. Posterior sternal sigilla very small, positioned laterally; anterior sigilla pairs small, oval, marginal. Chelicerae with distinct anterior tooth row comprising 5 teeth, posterior margin with single row of small denticles. Palpal endites with patch of small cuspules on proximal, inner margin, labium with 3 cuspules, LBw 0.71, LBl 0.35. Rastellum consists of 7 stout spines, 2 spines offset prolaterally. Legs. Leg I: 4.16, 2.92, 2.60, 1.83, 1.38; leg IV: 4.00, 2.25. Light scopulae on tarsus, metatarsus I, tarsus II. Tarsus I with single, slightly staggered row of 11 trichobothria. Leg I spination pattern illustrated in Figures 244, 245, 247, 248; TSp 3, TSr 5, TSrd 7. Pedipalp. Articles stout, lacking distinct spines (Figs 246); spines on retrolateral surface of cymbium. PTw 0.59, PTl 1.62, Bl 0.84. Embolus slender, tapering sharply toward tip, with serrations (Figs 246, 248). Variation (3). Cl 4.05-4.50, 4.31±0.13; Cw 3.41-3.75, 3.62±0.10; STRl 2.31-2.34, 2.32±0.01; STRw 2.04-2.13, 2.07±0.03; LBw 0.63-0.78, 0.71±0.04; LBl 0.35-0.35, 0.35±0; leg I: 4.16-4.56, 4.39±0.12; 2.92-3.25, 3.04±0.11; 2.58-2.85, 2.68±0.09; 1.83-1.95, 1.89±0.03; 1.38-1.56, 1.48±0.05; leg IV: 4.00-4.25, 4.17±0.08; 2.25-2.44, 2.33±0.06; PTl 1.62-1.65, 1.64±0.01; PTw 0.56-0.62, 0.59±0.02; Bl 0.84-0.93, 0.87±0.03; TSp 2-5, 3.33±0.88; TSr 2-6, 4.33±1.2; TSrd 6-11, 8.00±1.53.

Aptostichus derhamgiulianii is known from only a few male specimens, two of which were collected from pitfall traps during December (the other July), from sand dune habitats of the eastern foothills and ranges of the Mojave Desert (Map 29) in Inyo and Mono Counties.