Admesturius mariaeugeniae Bustamante & Scioscia

Bustamante, Abel A., Scioscia, Cristina L. & Casanueva, María E., 2014, A new species of Admesturius Galiano, 1988 from north Chile (Araneae: Salticidae: Amycoida), Zootaxa 3774 (2), pp. 197-200 : 197-200

Admesturius mariaeugeniae Bustamante & Scioscia , new species

Figs. 1–8 .

Type material. Male holotype ( MNNC 7001 ex MACN-Ar 29471) from Región de Antofagasta (II): Prov. Antofagasta: 8,1 km NNW Paposo, 60 km (por aire) N Taltal, 24.93947º S 70.49265º W (GPS +- 200m), elev. 114 m (barómetro), 27- 29/Oct/2011, desierto florido, matorrales (fogging Euphorbia ), colecta general, M. J. Ramírez, A. Ojanguren, J. Pizarro et al. coll. (MJR-loc-45). Paratypes: one male (MACN-Ar 29472) with same data as the holotype, one female ( MZUC- UCCC 39957) 19/Oct/2012 R. Honour coll. and one male (MZUC-UCCC 39958) 18/Oct/2012 A. Lüer coll. from Región de Coquimbo (IV): La Serena, Punta Teatinos.

Etymology. The specific name is a patronymic in honor of Dr. Maria Eugenia Casanueva for her contributions to the Chilean arachnology, her guidance to the senior author and her help and encourage during the development of the manuscript.

Diagnosis. It is easily recognized by the simple embolus, oriented to middle line of palp, the short RTA, and by the flattened and hook-shaped ventral branch of RTA rounded distally and pointing to palp dorsum ( Figs 5–8 ). The epigynum ( Figs. 2–4 ) resembles those of A. bitaenitus but the internal structures are more complex, with at least four loops in the insemination ducts. Abdomen with three pairs of dark spots on the dorsum ( Fig. 1 ).

Description. Male (holotype): Total length: 3.52. Carapace 1.66 long, 1.3 wide, 0.66 high. Ocular quadrangle 0.9 long. Anterior eye row 1.0 wide and posterior 1.10 wide. Distances: ALE-PME: 0.10; PME-PLE: 0.28. AME diameter: 0.26. Chelicera small, with three promarginal teeth and one retromarginal tooth. Length of femur: I 1.06, II 0.76, III 0.64, IV 1.02; patella: I 0.50, II 0.40, III 0.40, IV 0.44; tibia: I 0.80, II 0.40, III 0.36, IV 0.62; metatarsus: I 0.50, II 0.36, III 0.36, IV 0.46; tarsus: I 0.36, II 0.30, III 0.24, IV 0.40. Leg formulae: 1423. Leg spination (variation in parenthesis): femora: I d1-1, p1di; II d1-1, p1di; III d1-1, p1 (right p1-1), p1di, r1di; IV d1-1-1, p1di, r1di; tibiae: I v2; II v1 r; III p1, v1 p, r1; IV p1, v1 p-2, r1; metatarsi: I v2-2; II v2-2; III d2di, v2-1 p di; IV d1p-1r (right d1p) -2di, p1-1di, v2 di. Palp (figs. 5–8): RTA with two branches, one of them (dorsal branch) finger-like, smaller and more sclerotized than the ventral branch of RTA. Cymbium with some white scales retrolaterally. Bulb rounded with a prolateral-distal embolus. Color in alcohol: Carapace brown with ocular quadrangle yellow and two dark spots in the middle. A stripe of white scales covering the sides of carapace below lateral eyes. Abdomen yellow with three pairs of dark brown spots. Leg I dark brown, tarsus I and legs II to IV brown.

Variation (two specimens): Total length 3.34–3.80, carapace length 1.64–1.80, carapace width 1.30 (both), carapace high 0.72–0.64, Ocular quadrangle length 0.9–0.98.

Female (paratype): Total length: 3.85. Carapace 1.75 long, 1.2 wide, 0.85 high. Ocular quadrangle 0.55 long. Anterior eye row 1.05 wide and posterior 1.15 wide. Distances: ALE-PME: 0.12; PME-PLE: 0.32. AME diameter: 0.38. Chelicera small, with four promarginal teeth an one retromarginal tooth. Length of femur: I 0.84, II 0.80, III 0.70, IV 1.0; patella: I 0.60, II 0.50, III 0.30, IV 0.60; tibia: I 0.62, II 0.44, III 0.40, IV 0.50; metatarsus: I 0.44, II 0.34, III 0.36, IV 0.56; tarsus: I 0.26, II 0.30, III 0.36, IV 0.44. Leg formulae: 4123. Leg spination (variation in parenthesis): femora: I d1 (right d0); II p1di; III d1, p2di (right p1di), r1di; IV d1-1 (right d1-1-1), p1di, r1di (right r0); tibiae: I v1 r-2; II v1-1; III no spines; IV d1r, v1-2 di, p1; metatarsi: I v2-2; II v2-2; III d2di, v2-1 di; IV d1-2di, v1 p-2di, p1di. Epigynum ( Figs. 2–4 ): Posterior edge bilobed, slightly overtaking the epigastric furrow. With two straight and transverse slits leading to insemination ducts. Insemination ducts long and convoluted with at least four loops, spermathecae small and rounded. Color in alcohol: As the male, with light brown legs.

Distribution. Only known from Antofagasta and La Serena Regions in the Atacama-desert, Chile. Life history and habitat preferences. Some specimens were collected by fogging technique from the succulent plant Euphorbia .

Figures

FIGURES 1 – 8. Admesturius mariaeugeniae Bustamante & Scioscia n. sp. 1, 5 – 8, male holotype; 2 – 4 female genitalia (2 internal structures, 3 – 4 epigynum ventral). 1 dorsal habitus. 5 – 8 left male palp (5 – 6 prolateral, 7 – 8 ventral). Scale bars: 2 = 0.25 mm, 4, 6, 8 = 0.2 mm.