Soesilarishius muiratinga Ruiz, 2013, sp. nov.

Soesilarishius muiratinga sp. nov.

Figs 21, 29–31

Type material: Holotype: male from Parque Nacional da Serra do Pardo, São Félix do Xingu, Pará, Brazil, 5.767ºS, 52.617ºW, 27.IV.2012, G.R.S. Ruiz et al. (MPEG 20284).

Etymology. The specific epithet, a noun in native language in apposition, is the popular name of Maquira sclerophylla (Ducke) C.C. Berg, a common tree present in the type locality whose branches fall off easily. The embolus resembles the fallen branches of this species.

Diagnosis. Males of this species are similar to those of S. ruizi Zhang & Maddison by the shape and insertion of the embolus, but differ by the more stout and round embolus (Fig. 29). Females are unknown.

Description. Male holotype: Total length: 2.13. Carapace dark brown, 1.25 long, 0.90 wide, 0.66 high, with a median tuft of white scales behind the fovea (Fig. 21). Ocular quadrangle 0.73 long. Anterior eye row 0.99 wide and posterior 0.87 wide. Chelicera, endite, labium and sternum light brown. Palp dark brown, with an almost square RTA curving ventrally, ovoid tegulum and slightly elongate, stout embolus arising at the middle of a less sclerotized area on prolateral bulb (Figs 29–31). Legs 3412, I dark brown with metatarsus and tarsus yellow; II light with femur and proximal tibia dark brown; II yellow with dark brown femur; IV light with femur and proximal tibia dark brown. Length of femur: I 0.76, II 0.59, III 0.85, IV 0.66; patella + tibia: I 0.80, II 0.61, III 0.78, IV 0.76; metatarsus + tarsus: I 0.66, II 0.61, III 0.80, IV 0.85. Spination as in S. lunatus Ruiz. Abdomen dark brown, dorsally with a light anterior border covered with white scales and four round light spots on the posterior half (Fig. 21); the lateral light spots almost are fused with ventral, cream-colored round areas. Spinnerets light brown.

Female. Unknown.

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

Biological note. Same biology as that described for S. chaplini sp. nov.