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 ( BJR998 , 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 ( BJR845 , CAS); 1♀, Curico, El Coihue, 20km E Potrero Grande , 70.97°W, 35.18°S, 18 Jun, 2004, E. Arias et al, fogging ( BJR1002 , 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 ( BJR989 , 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 ( BJR976 , CAS); 33, 2 imm, Loquimay, Las Raices Tunnel , 71.65°W, 38.57°S, 17 December 2001, E. Arias et al., fogging, Nothofagus forest ( BJR1028 , CAS); 13, Villarrica , Flor del Lago Ranch , Chile, 72.13°W, 39.20°S, 21 March 2005, E. Arias et al., fogging, Nothofagus forest ( BJR1006 , CAS); 13, Villarrica , Flor del Lago Ranch , 72.13°W, 39.20°S, 21 March 2005, E. Arias et al., fogging, Nothofagus forest ( BJR1057 , 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. L1 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), (P4+T4) 1.09+0.10 (4).

Female: Colouration ( Fig. 11 ) as in the male. All legs yellow with occasional darker markings. L1 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), (P4+T4) 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