Admesturius schajovskoyi Galiano, 1988

Barry J. Richardson, 2010, A Review of the Jumping Spider Fauna (Araneae: Salticidae) of Chile, Zootaxa 2418, pp. 1-49 : 11

Admesturius schajovskoyi Galiano, 1988

Figs 11–17

A. schajovskoyi Galiano, 1988: 292 –294 , figs 6, 11–12, 20– 26.

Material examined. CHILE: 1 ♀, Curico, El Coihue, 20km E Potrero Grande , 70.97 °W, 35.18 °S, 23 November 2003, J.E. Barriga-Tunon et al., fogging ( BJR 998 , CAS); 1 ♀, 4, Curico, El Coihue, 20km E Potrero Grande , 70.97 °W, 35.18 °S, 23 November 2003, J.E. Barriga-Tunon et al., fogging ( BJR 845 , CAS); 1 ♀, Curico, El Coihue, 20km E Potrero Grande , 70.97 °W, 35.18 °S, 18 Jun, 2004, E. Arias et al, fogging ( BJR 1002 , CAS); 1 ♀, 23 Curico, El Coihue, 20km E Potrero Grande , 70.97 °W, 35.18 °S, 26 March 2007, J.E. Barriga-Tunon et al., fogging ( BJR 989 , CAS); 1 ♀, Curico, El Coihue, 20km E Potrero Grande , 70.97 °W, 35.18 °S, 27 May, 2007, J.E. Barriga-Tunon et al., fogging ( BJR 976 , CAS); 33, 2 imm, Loquimay, Las Raices Tunnel , 71.65 °W, 38.57 °S, 17 December 2001, E. Arias et al., fogging, Nothofagus forest ( BJR 1028 , CAS); 13, Villarrica , Flor del Lago Ranch , Chile, 72.13 °W, 39.20 °S, 21 March 2005, E. Arias et al., fogging, Nothofagus forest ( BJR 1006 , CAS); 13, Villarrica , Flor del Lago Ranch , 72.13 °W, 39.20 °S, 21 March 2005, E. Arias et al., fogging, Nothofagus forest ( BJR 1057 , CAS).

Diagnosis : The two species of this genus are most simply distinguished by the markedly different patterns on the abdomens found in both sexes. In A. schajovskoyi , this consists of a pattern of scattered patches ( Figs 11–12 ) unlike the pair of parallel lines of dark patches seen in A. bitaeniatus ( Figs 4–5 ). In the males the shapes of the more ventral of the two apophyses has a pointed, often hook-shaped end. In the females, the epigynum has curved, slit-like fossae connected anteriorly forming an inverted υ shape. The insemination ducts are short and the spermathecae not subdivided into compartments.

Description . Male: Body form flattened. Cephalothorax ( Fig. 12 ) tan colour, its lower margin darker with a pair of darker patches on the pars cephalica, occasionally in a background of extensive white guanine deposits. A band of lateral white hairs along each side of the cephalothorax. Surrounds of ALE, PME and PLE, black. Clypeus short, mid-dark brown with a white fringe of hairs. Chelicerae vertical, dark brown, with three promarginal teeth and one retromarginal tooth. Labium brown. Endites and sternum yellow to brown. Abdomen yellow, with a single median dark strip branching to the sides and made from darker semicontiguous patches ( Fig. 12 ). A scattering of variously sized, dark patches over the dorsal surface. Ventral abdomen dark with a scatter of light spots and some white guanine deposits. Spinnerets yellow, darker on the undersurface of the median pair. L 1 much larger and heavier than the other legs, dark brown femur with three dorsal spines, tibia and metatarsus with a single and two pairs of ventrolateral spines, respectively. Other legs yellow with brown markings. Femur with two dorsal and two dorsolateral spines, tibia and metatarsus with a single and one pair of ventrolateral spines respectively. Palp ( Figs 15–16 ): tibia with two apophyses, ventral one with distinctive curved and pointed end. Tegulum without lobe, rounded, embolus medium length, not coiled, set in crater-like depression. Dimensions: CL 1.80 + 0.15 (4), EFL 0.75 + 0.05 (4), CW 1.25 + 0.13 (4), AEW 1.01 + 0.09 (4), AMEW 0.72 + 0.07 (4), PEW 1.04 + 0.09 (4), SL 0.74 + 0.06 (4), 0.72 + 0.04 (4), ( P 4 + T 4) 1.09 + 0.10 (4).

Female : Colouration ( Fig. 11 ) as in the male. All legs yellow with occasional darker markings. L 1 not as heavily built as in the male and tibia and metatarsus with 1 and 2 pairs of ventrolateral spines, respectively. Spination on other legs as in the male. Epigynum ( Figs 13–14 ): sclerotised, a distinct, dark brown plate with a median posterior notch and median pocket in the posterior edge of the epigynum. Curved, slit-like fossa connected anteriorly forming an inverted υ shape. Insemination ducts short, spermathecae not subdivided into compartments ( Fig. 13 ). Dimensions: CL 1.86 + 0.07 (4), EFL 0.80 + 0.04 (4), CW 1.24 + 0.05 (4), AEW 1.04 + 0.03 (4), AMEW 0.73 + 0.03 (4), PEW 1.10 + 0.03 (4), SL 0.73 + 0.04 (3), ( P 4 + T 4) 1.16 + 0.06 (4).

Biology and Distribution. The flattened body form and reduced spination implies that the species lives under bark. In general form it is similar to the Australian genus Holoplatys ( Zabka 1991) . The species is distributed in the Andean foothills in Chile ( Fig. 17 ) and in Argentina ( Galiano 1988). It was found on Araucaria and Nothofagus trees.

Figures

FIGURES 11 – 17. Admesturius schajovskoyi. 11 – 12 dorsal view (11 female, 12 male); 13 – 14 female genitalia (13 dorsal view of cleared specimen, 14 ventral view of external characteristics); 15 – 16 male palp (15 ventral view, 16 lateral view); 17 known distribution. Scales: total body 1 mm; remainder 0.2 mm

FIGURES 4 – 10. Admesturius bitaeniatus. 4 – 5 dorsal view (4 female, 5 male); 6 – 7 female genitalia (6 dorsal view of cleared specimen, 7 ventral view of external characteristics); 8 – 9 male palp (8 ventral view, 9 lateral view); 10 known distribution. Scales: total body 1 mm; remainder 0.2 mm