Helicosina sica Kuwahara & Marshall & Yau 2024, sp. nov.

Helicosina sica Marshall sp. nov. (Figs. 1, 2C–D, 3B, 5, 8) Description. Body length: Males 2.0– 2.2 mm, female 2.1 mm. General (Fig. 2C): Male fore and hind femora strongly thickened (length 3.0–3.2 × and 3.1–3.5 × width, respectively). Male abdomen (Fig. 5): S5 broad, desclerotized posteromedially, and densely setose laterally. Posterior opening of epandrium circular (medial height subequal to medial width); subanal plate with a dark, sclerotized I-shaped medial pattern. Surstylus strongly sinuate, basal half bulbous and setulose externally, apical half strongly constricted with several setae anterobasally. Postgonite small, truncate apically. Phallapodeme relatively short and weakly developed. Basiphallus stout, slightly curved, with an elongate, apically pointed epiphallus; distiphallus stout, largely membranous and supported by several sclerites: a V-shaped posterior sclerite, a triangular upper sclerite, and paired V-shaped upper-lateral sclerites; lower surface grooved with scattered darkened spots; lateral membrane with an elongate row of stout setulae. Material examined. Holotype: ECUADOR: Napo: Jatun Sacha Reserve, 6 km E Misahualli, 1˚04’S 77˚37’W, 450 m a.s.l., landslide in forest, Malaise, 30.iv.–7.v.2002, Buck et al. (♂, QCAZ) Paratypes: ECUADOR: Napo: Tiputini Biodiversity Station, 0˚36’50”S 76˚09’01”W, in Heliconia furl, v.2011, S.A. Marshall (2 ♂, 1 ♀, DEBU, QCAZ). One of the male paratypes is shown in Fig. 1. Type locality. Ecuador, Napo, Jatun Sacha Reserve. Etymology. The specific name (from the Latin ‘sica’: dagger, poniard) is inspired by the blade- or dagger-like shape of the surstylus.