Planinasus aenigmaticus Mathis, Rung & Kotrba 2012

Moderately small flies, body length 2.70 mm (holotype). Head: Frons mostly bare, shiny, except for more densely microtomentose, anterolateral angles; frons wider than long, frontal ratio 0.50–0.58; interfrontal seta moderately short, about 2/3 length of lateral vertical seta. Antenna unicolorous, blackish brown; pedicel with ventral projection short, not extended anteriorly much beyond dorsal margin; basal flagellomere short, about as long as high, mostly yellow (faintly black around base of arista); arista bearing 8–9 dorsal rays, 3–4 ventral rays. Face comparatively narrow; facial ratio 0.24–0.39; dorsal half of face shield-like, mostly bare, roughly pentagonal, with yellowish to slightly bluish reflections; large facial setae arranged in 2–3 irregular, transverse rows, dorsal row with 4 setae, 2 dorsoclinate, 2 ventroclinate; ventral facial row with 4 ventroclinate setae. Clypeus and palpus blackish brown. Thorax: Generally dark brown but with some paler, mostly yellowish areas along margins of sclerites; mesonotum moderately invested with whitish gray microtomentum, appearing dull medially, becoming subshiny, less microtomentose laterally; postpronotum yellowish; area from postpronotum and through notopleuron mostly bare, shiny; anepisternum moderately invested with very fine microtomentum, mostly appearing dull; other pleural areas less densely invested. Wing mostly hyaline to very faintly infumate, without pattern. Coxae whitish yellow; femora whitish yellow on basal 2/3, only distal 1/3 dark brown; forefemur bearing 1–3 subequal, posteroventral setae at apical 1/3; lacking a preapical annulus; tibiae with base and apex yellow, middle 2/3 brownish black; basitarsomere yellowish, apical 3–4 tarsomeres darker; forefemur bearing 2 setae at apical 1/3 along posteroventral surface. Abdomen: Uniformly blackish brown, mostly subshiny, moderately invested with microtomentum. Male abdomen: Tergites 1+2-6 well developed, lengths of tergites 3–6 subequal; sternite 3 only slightly wider than long, posterior margin sinuous with a medial, broad, rounded projection; width of sternite 4 over twice length, sclerotized portion moderately deeply emarginate with broad, V-shaped membranous area posteriorly; width of sternite 5 over twice length, becoming slightly wider posteriorly, posterior margin shallowly emarginate, bearing 1–2 setulae at posterolateral corners; sternite 6 apparently absent; sternite 7 narrow, forming an annulus with tergite 7. Male terminalia (Figs 1–4): Epandrium in lateral view (Fig. 1) triangular to trapezoidal, dorsal margin narrowly angulate; surstylar length slightly less than half length of epandrium, surstylus extended from ventral margin of epandrium in nearly vertical alignment with anterior margin of it , in lateral and ventral views (Figs 1–2) digitiform, apex bluntly rounded to truncate, length approximately twice width, bearing 4 strong posteromedial setulae and a few smaller setulae along posterior and apical portions; hypandrium in ventral view (Fig. 2) U-shaped with anterior portion of U with a short, trapezoidal projection; pregonite in ventral view (Fig. 2) approximately triangular, with anterior margin receded; postgonite in ventral view convoluted (Fig. 2), apex bearing narrow subrectangular projection, with robustly developed, clavate lobe bearing more than 20 setulae, in lateral view (Fig. 4) with lobe moderately expanded, broadly rounded apically, bearing numerous setulae; phallus large, in ventral and lateral views (Figs 2, 4) complex, mostly sclerotized; phallapodeme in lateral and ventral views (Figs 2, 4) elongate, tubular, truncate apically; ejaculatory apodeme in lateral view (Fig. 3) large, about 1/3 longer than length of phallapodeme , apical half greatly expanded, fan-like, basal half narrow, stem-like but slightly expanded toward base.

(Fig. 5). Neotropical: Colombia (Bogota, Valle del Cauca).