Soesilarishius excentricus, Ruiz, Gustavo Rodrigo Sanches, 2013

Ruiz, Gustavo Rodrigo Sanches, 2013, Nine new species of Soesilarishius from Brazil (Araneae: Salticidae: Euophryinae), Zootaxa 3664 (4), pp. 586-600 : 594-595

Soesilarishius excentricus sp. nov.

Figs 22–24 , 32–33

Type material: Holotype: male from Parque Nacional da Serra das Confusões (Boi), Piauí, Brazil, 9.220ºS, 43.491ºW, 9–15.XII.2010, L.S. Carvalho et al. (MPEG 20285). Paratype: 1 male, same data as holotype, CHNUFPI.

Additional material examined. BRAZIL: Piauí: Parque Nacional da Serra das Confusões (Boi, 9.220083ºS, 43.49075ºW), 9–15.XII.2010, L.S. Carvalho et al.: 19 males (MPEG 20286–20291).

Etymology. The specific epithet is a Latin adjective referring at the same time to the atypical palp for the genus and to the curling embolus, relocated on the prolateral side ( Figs 24 , 32 ).

Inclusion in Soesilarishius . This is a small, ground dwelling jumping spider recognized as an euophryine by the retrolateral sperm duct loop ( Fig. 33 ). However, its generic placement is not obvious because of the atypical male palp. The species is thought to belong in Soesilarishius by the similarities with the other species, especially with S. crispiventer Ruiz, 2011 , with whom it may share the modified abdominal ventral scales (see Fig. 23 ; compare to Ruiz, 2011, fig. 59). The elongate, clockwise curling embolus and the round tegulum could also be characters shared by these two species, although S. crispiventer has no developed tegular projection. The developed tegular projection of S. excentricus is thought to be homologous to the “distal bump” of S. minimus Ruiz, 2011 , S. lunatus Ruiz, 2011 , S. spinipes Ruiz, 2011 and the tegular “distal retrolateral projection” of S. cymbialis Ruiz, 2011 (see Ruiz, 2011, figs 2–3, 16–17, 24–25, 28–29).

Diagnosis. This species can easily be distinguished from any other known species by the male palp with a long embolus coiling on the prolateral side, and by the elongate, hook-like projection on the retrolateral tegulum ( Figs 24 , 32–33 ).

Description. Male holotype: Total length: 1.90. Carapace light brown, 1.09 long, 0.80 wide, 0.57 high, with cephalic region dark brown and a pair of tufts of white scales behind the posterior eyes ( Fig. 22 ). Ocular quadrangle 0.66 long. Anterior eye row 0.87 wide and posterior 0.78 wide. Chelicera, endite, labium and sternum yellow. Palp yellow, with a simple RTA, an elongate cymbium, a globose tegulum with a retrolateral, hook-shaped projection and an elongate embolus arising at the middle of the prolateral face, curling clockwise, accompanied by a paraembolic, short, hook-shaped apophysis ( Figs 24 , 32–33 ). Legs 4312, yellow. Length of femur: I 0.57, II 0.52, III 0.68, IV 0.66; patella + tibia: I 0.64, II 0.52, III 0.68, IV 0.71; metatarsus + tarsus: I 0.57, II 0.52, III 0.71, IV 0.80. Spination as that described for S. crispiventer (Ruiz, 2011, fig. 64). Abdomen variegated with dark brown ( Fig. 22 ), ventrally covered by small, rigid setae, similar to those described for S. crispiventer (Ruiz, 2011, fig. 59) ( Fig. 23 ). Spinnerets yellow.

Female. Unknwon.

Distribution. Known only from the State of Piauí, Brazil.

Figures

FIGURES 19 – 24. Soesilarishius paxiuba sp. nov. 19 male habitus; 20 female habitus. Soesilarishius muiratinga sp. nov. 21 male habitus. Soesilarishius excentricus sp. nov. 22 male habitus; 23 same, ventral view; 24 same, detail of left male palp, prolateral view.

FIGURES 32 – 33. Soesilarishius excentricus sp. nov., left male palp (32 prolateral, 33 retrolateral).