Admesturius bitaeniatus (Simon, 1901),

Barry J. Richardson, 2010, A Review of the Jumping Spider Fauna (Araneae: Salticidae) of Chile, Zootaxa 2418, pp. 1-49: 8-9

publication ID

http://doi.org/ 10.5281/zenodo.194411

persistent identifier

http://treatment.plazi.org/id/911E87A7-E408-FFC2-FF4B-F962386B8C98

treatment provided by

Plazi

scientific name

Admesturius bitaeniatus (Simon, 1901)
status

 

Admesturius bitaeniatus (Simon, 1901) 

Figs 4–10View FIGURES 4 – 10

Admestina bitaeniata Simon, 1901 a: 615, 624  ; 1902: 28; Galiano, 1962 a: 68; 1963: 283, pl. 3, figs 1 –3, 9; 1988: 295, figs 5, 9–10, 19.

Material examined. CHILE: 2 ♀, 10km E Los Quenes , 70.80 °W, 35.02 °S, 10 March 2003, J.E. Barriga, fogging ( BJR 978, CAS)GoogleMaps  ; 1 ♀, Curico, El Coihue, 20km E Potrero Grande , 70.97 °W, 35.18 °S, 28 September 2003, J.E. Barriga-Tunon et al., fogging ( BJR 1055, CAS)GoogleMaps  ; 1 ♀, Curico, El Coihue, 20km E Potrero Grande , 70.97 °W, 35.18 °S, 7 November 2003, J.E. Barriga-Tunon et al., fogging ( BJR 1000, CAS)GoogleMaps  ; 13, Curico, El Coihue, 20 km E Potrero Grande , 70.97 °W, 35.18 °S, 7 November 2003, J.E. Barriga-Tunon et al., fogging ( BJR 977, CAS)GoogleMaps  ; 3 ♀, 63, Curico, El Coihue, 20 km E Potrero Grande , 70.97 °W, 35.18 °S, 23 November 2003, J.E. Barriga-Tunon et al., fogging ( BJR 104, CAS)GoogleMaps  ; 1 ♀, Curico, El Coihue, 20km E Potrero Grande , 70.97 °W, 35.18 °S, 25 November 2003, J.E. Barriga-Tunon et al., fogging ( BJR 967, CAS)GoogleMaps  ; 13, Curico, El Coihue, 20km E Potrero Grande , 70.97 °W, 35.18 °S, 25 November 2003, J.E. Barriga-Tunon et al., hand collecting ( BJR 997, CAS)GoogleMaps  ; 13, Curico, El Coihue, 20km E Potrero Grande , 70.97 °W, 35.18 °S, 25 November 2003, J.E. Barriga-Tunon et al., fogging ( BJR 1052, CAS)GoogleMaps  ; 13, Curico, El Coihue, 20km E Potrero Grande , 70.97 °W, 35.18 °S, 30 December 2003, J.E. Barriga-Tunon et al., fogging ( BJR 971, CAS)GoogleMaps  ; 3 ♀, Curico, El Coihue, 20km E Potrero Grande , 70.97 °W, 35.18 °S, 26 March 2007, J.E. Barriga-Tunon et al., fogging ( BJR 1045, CAS)GoogleMaps  ; 1 ♀, 13, Cauquenes, Los Rules, 20 km W Cauquenes , 72.35 °W, 35.88 °S, 1 October 2003, J.E. Barriga-Tunon et al. ( CAS, BJR 969)GoogleMaps  ; 4 ♀, 43, 5imm, Malalcahuello Way, Lonquimay , 71.52 °W, 38.43 °S, 19 January 2007, fogging, Araucaria  ( BJR 1010, CAS)GoogleMaps  ; 1 ♀, Comunidad Indigena Quinquen , 71.38 °W, 38.63 °S, 6 March 2008, E. Arias et al., fogging, Araucaria  ( BJR 1090, CAS)GoogleMaps  ..

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. bitaeniatus  , this consists of a pair of parallel lines of dark patches ( Figs 4–5View FIGURES 4 – 10) unlike the pattern of scattered patches seen in A. schajovskoyi  ( Figs 11–12View FIGURES 11 – 17). The area between the parallel lines is occasionally so dark as to give the impression of a single large dark area. In the males the shapes of the more ventral of the two apophyses has a club-shaped end sometimes tending to hook-shaped. In the females, the epigynum has two straight, slit-like fossae, angled away from the median line and distinctive, well separated copulatory openings. Insemination ducts are long and convoluted, spermathecae subdivided into compartments.

Description. Male: Body form flattened. Cephalothorax tan colour with its lower margin darker. A pair of darker patches on the pars cephalica, often in an underlying background of extensive white guanine deposits. A lateral band of 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, yellow-orange, with five promarginal teeth and one retromarginal tooth. Endites and labium yellow-brown. Sternum yellow. Abdomen yellow, with two dorsal parallel longitudinal bands made from darker semi-contiguous patches ( Fig. 5View FIGURES 4 – 10) and with an overall pattern of small black spots ( Fig. 5View FIGURES 4 – 10). Often a faint pattern of inverted V shaped bands posteriorly and a distinct brown scutum. The area between the parallel lines is occasionally so dark as to give the impression of a single large black area. Ventral surface light with a scatter of darks spots and extensive white guanine deposits, occasionally entire surface of abdomen darker. Spinnerets yellow with dark spots on the undersurface. L 1 much larger and heavier than the other legs, femur, patella, tibia dark brown, without spines. Metatarsus yellow with two pairs of ventrolateral spines. Other legs yellow with brown markings, tibia and metatarsus with three and two pairs of ventrolateral spines, respectively. Palp ( Figs 8–9View FIGURES 4 – 10): tibia with two apophyses, ventral one with distinctive club shaped end sometimes tending to hook shape. Tegulum without lobe, rounded, embolus medium length, not coiled, set in crater-like depression. Dimensions: CL 1.540 .0 5 (5), EFL 0.64 + 0.03 (5), CW 1.00+ 0.07 (5), AEW 0.85 + 0.07 (5), AMEW 0.61 + 0.05 (5), PEW 0.90 + 0.06 (5), SL 0.66 + 0.07 (5), ( P 4 + T 4) 0.91 + 0.06 (4).

Female: Colouration as in the male, except abdominal band usually stronger and other markings missing ( Fig. 4View FIGURES 4 – 10). All legs yellow with occasional darker markings. L 1 not as heavily built as in the male and tibia and metatarsus with one and two pairs of ventrolateral spines, respectively. Spination on other legs as in the male. Epigynum ( Figs 6–7View FIGURES 4 – 10): a sclerotised, distinct, dark brown plate with a median posterior notch and a pocket in the posterior edge of the epigynum. Two straight, slit-like fossa angled away from the median line with distinctive, well separated copulatory openings. Insemination ducts long and convoluted, spermathecae subdivided into compartments ( Fig. 6View FIGURES 4 – 10). Dimensions: CL 1.61 + 0.06 (5), EFL 0.71 + 0.03 (5), CW 1.050 (5), AEW 0.930 (5), AMEW 0.63 + 0.03 (5), PEW 0.97 + 0.03 (3), SL 0.680 (5), ( P 4 + T 4) 1.03 + 0.09 (5).

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 widely in Chile ( Fig. 10View FIGURES 4 – 10) and was found on Araucaria  and Nothofagus  trees. An earlier report of the species in Argentina ( Galiano 1962 a) is of A. schajovskoyi ( Galiano 1988)  .

CAS

USA, California, San Francisco, California Academy of Sciences

CAS

California Academy of Sciences

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Salticidae

Genus

Admesturius

Loc

Admesturius bitaeniatus (Simon, 1901)

Barry J. Richardson 2010
2010
Loc

Admestina bitaeniata

Galiano 1962: 68
Simon 1901: 615
1962