Atomosphyrus tristiculus Simon, 1902,

Barry J. Richardson, 2010, A Review of the Jumping Spider Fauna (Araneae: Salticidae) of Chile, Zootaxa 2418, pp. 1-49: 14

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Atomosphyrus tristiculus Simon, 1902


Atomosphyrus tristiculus Simon, 1902 

( Figs 18–25View FIGURES 18 – 25)

Atomosphyrus tristiculus Simon, 1902: 405  ; 1903: 861, 862; Galiano, 1963: 305 –306, pl. 10, figs 5–8; 1966: 282–284, figs 9 –16, 19, 20.

Material examined. CHILE: 13, 1♀ Valle del Rio Mapocho, Santiago , January 1959, H. Zapfe ( BJR 854, MACN 5883)  ; 1 ♀, Termas de Chillan Road, Puente el Aserradero , 71.45 °W, 36.92 °S, 30 November 2001, F.G. Andrews ( BJR 970, CAS)GoogleMaps  .

Diagnosis . The only other species in the genus ( A. breyeri Galiano, 1966  , from Argentina) can be distinguished by the presence of a large tooth in the middle of the anterior face of the chelicera in male A. tristiculus  ( Fig. 25View FIGURES 18 – 25) and by the shape of the more dorsal of the two apophyses. This has a hook shaped end rather than the square end found in A. breyeri ( Galiano 1966)  . In the females, the spermathecae are more than twice the length of a fossa and anterior to the fossae ( Figs 20–21View FIGURES 18 – 25, unlike A. breyeri  .

Description : Male: Body form somewhat ant-like ( Fig. 19View FIGURES 18 – 25). Cephalothorax black with a lighter orange area on the pars cephalica, with a distinct constriction in the region of PME, body and legs black with scattered orange reflective hairs. Palps black with white scales. Labium, endites and sternum all black. Clypeus short, black. Chelicerae vertical, black, grading to mid brown, with three large and two small promarginal teeth and two retromarginal teeth. White border on anterior third of dorsal abdomen. Unlike female, no pair of white patches on the dorsolateral edges of the abdomen. Ventral abdomen black with a scatter of small light markings. Spinnerets black. Spines (specimen damaged, after Galiano 1966): femur without spines, L 1 tibia with two pairs of ventrolateral spines, L 2 –L 4 tibia with two ventral spines and all metatarsi with two pairs of ventrolateral spines. Palp ( Figs 22–23View FIGURES 18 – 25): black, tibia with two small apophyses. Tegulum round, without lobe, embolus long and wound around tegulum, final section set in depression, tip bent. Dimensions: CL 1.67, EFL 0.74, CW 1.11, AEW 0.96, AMEW 0.62, PEW 0.96, SL 0.74.

Female : Similar in form to the male except abdomen mostly cream colour anteriorly with dark patches and covered with grey and white pennate hairs grading to black posteriorly and two pairs of distinct, large white patches on dorsolateral edges of the abdomen ( Fig. 18View FIGURES 18 – 25). Legs black with orange longitudinal stripes and orange tarsi. Epigynum ( Figs 20–21View FIGURES 18 – 25): lightly sclerotised. Spermatheca anterior to the fossa. Insemination ducts long and coiled, spermathecae subdivided into compartments ( Fig. 20View FIGURES 18 – 25). Dimensions: CL 1.98, EFL 0.93, CW 1.30, AEW 1.18, AMEW 0.74, PEW 1.18 SL 0.93, ( P 4 + T 4) 1.80.

Biology and distribution. Only known from three localities in Chile ( Fig. 24View FIGURES 18 – 25). The species appears to be an ant mimic resembling Camponotus  .


USA, California, San Francisco, California Academy of Sciences


California Academy of Sciences














Atomosphyrus tristiculus Simon, 1902

Barry J. Richardson 2010

Atomosphyrus tristiculus

Galiano 1963: 305
Simon 1902: 405