Soesilarishius micaceus Zhang & Maddison, 2012, sp. nov.

Soesilarishius micaceus sp. nov.

Figs 102–108

Type material. Holotype: male, ECUADOR: Sucumbios: Reserva Faunistica Cuyabeno, Laguna Grande, Neotropic cabins; camp area & trail to Sendero La Hormiga, 22–27 April 1994, coll. W. Maddison, WPM#94–025 (UBC-SEM AR00161, QCAZ). Paratypes: 1 female, same data as holotype (UBC-SEM AR00162); 7 males, same data as holotype; 3 females, ECUADOR: Napo: Reserva Faunistica de Cuyabeno, Laguna Grande, PUCE field station, Sendero Campamento, trail through forest, 25–29 June 1988, coll. W. Maddison, WPM#88–007.

Etymology. The specific epithet is derived from the Latin mica (crumb), referring to the small size of this species.

Diagnosis. Differs from Soesilarishius amrishi Makhan, 2007 in the long embolus (Fig. 104). Similar in the color pattern and markings to S. ruizi (Figs 102–103), but can be distinguished by the long and slender embolus (Fig. 104), the presence of a roof and the absence of a medial groove on the epigynum (Fig. 107), the longer copulatory duct of the vulva (Fig. 108).

Description. Male (holotype, UBC-SEM AR00161). Carapace length 1.0 (variation 0.9–1.1, n=8); abdomen length 0.7. Chelicera (Fig. 106): yellow brown. Palp (Figs 104–105): yellow brown. Embolus long and coiled, coming from prolateral side of bulb; retrolateral tibial apophysis short and finger–like. First tibia with three pairs of ventral macrosetae; first metatarsus with two pairs. Measurements of legs: I 1.7, II 1.4, III 2.0, IV 1.7. Color in alcohol (Fig. 102): carapace dark brown to dark yellow brown; abdomen gray brown with light yellow spots and markings, anterior and median part with a relatively sclerotized area; legs brown to light yellow.

Female (paratype, UBC-SEM AR00162). Carapace length 0.9 (variation 0.9–1.1, n=4); abdomen length 1.0. First tibia with three pairs of ventral macrosetae; first metatarsus with two pairs. Measurements of legs: I 1.7, II 1.4, III 1.8, IV 1.8. Epigynum (Fig. 107): with a median transverse “roof”; opening to copulatory duct anteriorly. Vulva (Fig. 108): copulatory duct long and convoluted; spermatheca small, not strongly swollen. Color in alcohol (Fig. 103): similar to that of male.

Natural history. Specimens were found on leaf litter in forest.