Aptostichus pennjillettei Bond 2012

Specimen preparation and condition. Specimen collected from pitfall trap, preserved in 70% ethanol. Coloration presumed to be moderately faded. Pedipalp, leg I left side removed stored in vial with specimen. General coloration. Carapace, chelicerae, and legs red 2.5YR 4/6. Abdomen uniform strong brown 7.5YR 4/6 dorsally, ventrally spinnerets same. Cephalothorax. Carapace 4.50 long, 4.06 wide, glabrous, stout black bristles along fringe; surface smooth, pars cephalica moderately elevated (Fig. 120). Fringe, posterior margin with black bristles. Foveal groove deep, slightly procurved. Eyes on mound. AER slightly procurved, PER slightly recurved. PME, AME subequal diameter. Sternum moderately setose, STRl 2.79, STRw 2.25. Posterior sternal sigilla intermediate size, positioned centrally, not contiguous, anterior sigilla pairs small, oval, marginal. Chelicerae with distinct anterior tooth row comprising 6 teeth, posterior margin with single row of small denticles. Palpal endites with patch of 10 small cuspules on proximal, inner margin, labium 2 cuspules, LBw 0.78, LBl 0.51. Rastellum consists of 6 very stout spines. Abdomen. Setose, black setae intermingled with fine black setae. Legs. Leg I: 5.00, 3.60, 3.55, 2.33, 2.02; leg IV: 4.90, 2.50. Light tarsal scopulae on legs I, II. Tarsus I with single, slightly staggered row of 14 trichobothria. Leg I spination pattern illustrated in Figures 121-125; TSp 3, TSr 3, TSrd 3. Pedipalp. Articles slender, lacking distinct spines (Fig. 126). PTw 0.77, PTl 2.23, Bl 1.10. Embolus slender, tapering sharply toward tip, lacking serrations (Fig. 126). Variation (10). Cl 4.06-5.81, 4.79±0.19; Cw 3.31-5.00, 3.98±0.19; STRl 2.19-3.54, 2.73±0.14; STRw 1.80-2.58, 2.18±0.09; LBw 0.53-0.98, 0.74±0.04; LBl 0.30-0.53, 0.40±0.03; leg I: 4.06-5.94, 4.85±0.21; 2.94-4.06, 3.43±0.12; 2.50-4.13, 3.26±0.20; 1.92-2.70, 2.22±0.09; 1.35-2.13, 1.75±0.11; leg IV: 3.81-5.88, 4.58±0.23; 2.13-2.88, 2.40±0.10; PTl 1.62-2.61, 2.05±0.13; PTw 0.54-0.86, 0.69±0.04; Bl 0.83-1.26, 1.03±0.05; TSp 3-4, 3.20±0.13; TSr 3-5, 4.20±0.2; TSrd 3-5, 4.10±0.18.

The known distribution of Aptostichus pennjillettei is restricted to Mojave Desert localities in Nye and Clark Counties of Nevada. Males appear to disperse during the winter months of November-March.