Apotropina ruidosa Ramos-Pastrana, Córdoba-Suarez & Riccardi, 2024, sp. nov.

Apotropina ruidosa sp. nov. (Figs 9–16, 25–26) Diagnosis. Postpedicel rounded, dark brown on upper ¼, yellow on lower ¾ in external surface (Fig. 9); fore coxa dark yellow, darker anteriorly (Fig. 9); all trochanters yellow; all legs with anterior apex of femur, tibia and first tarsomere yellow (Fig. 9); tibial organ narrow, dark gray, ~ 3.3× shorter than hind tibial length (Fig. 9); hind tibial spur straight and shorter than tibia width; surstylus narrowed in profile (Fig. 13); cercus at least 1.5× longer than wide, with straight setae shorter than surstylus length (Figs 15–16). Description. MALE (holotype). Body length 2.6 mm. Wing length 2.8 mm. Body dark brown with ochre pruinosity. Head (Figs 9–10). Wider than long dorsally and longer than high in profile. Ocellar seta as long as inner and outer vertical setae. Postocellar seta cruciate, ~ ⅔ length of ocellar seta. Three strong fronto-orbital setae, the anterior seta ~ ½ length of posterior setae, the two posterior setae ~ each equal to length of ocellar seta; anterior fronto-orbital seta proclinate the two posterior setae lateroclinate. Inner vertical seta proclinate, outer vertical seta lateroclinate. Frons dark brown basally, apical ¼ yellow, slightly wider than long, lateral margins diverging posteriorly to vertex, apical margin sinuous. Ocellar triangle extending to ~ ⅔ length of frons, posterior margin nearly as wide as frons, lateral margins straight, apex acute. Eye oval, long axis slightly oblique. Face pale yellow, about as high as wide; postpedicel rounded, dark brown on upper ¼, yellow on lower ¾ in external surface; arista black, with short, sparse pubescence, as long as ½ frons; genal height equal to height of postpedicel, with whitish pruinosity; one vibrissa; occiput and postgena dark brown; proboscis brown; palpus yellow with yellow setulae; clypeus darkened. Thorax (Figs 9, 11). Scutum dark brown, ~ 1.2× longer than wide, pruinose; postpronotal lobe concolorous with scutum, with two long setae equal in length to notopleural setae; 1+1 notopleural setae; 5 strong dorsocentral setae, prescutellar dorsocentral seta ~ 2× longer than remaining dorsocentral setae; pleuron with brown pruinosity; katepisternum with pale setulae. Scutellum concolorous with scutum, with black pilosity, apical scutellar seta ~ 3× longer than subapical scutellar seta. Halter stem brown, knob yellowish. Wing (Fig. 12). Hyaline; costal ratios measured from h: R 1: R 2+3: R 4+5 is 4: 5: 4: 2; veins R 4+5 and M 1 subparallel; distance between r-m and dm-m 4× length of r-m. Legs (Fig. 9). Dark brown; fore coxa dark yellow, darker anteriorly; all trochanters yellow; all legs with anterior apex of femur, tibia and first tarsomere yellow; tibial organ narrow, dark gray, ~ 3.3× shorter than hind tibia (Fig. 9); hind tibial spur straight and slightly shorter than width of tibia. Abdomen (Fig. 9). Tergites brown to dark brown. Terminalia (Figs 13–16). Postabdominal sclerites asymmetric; syntergosternite 7+8 about as long as hypandrium; sternite 6 slightly curved, wider apically; sternite 5 slightly curved, wider medially, tapering to extremes, ~ 10× longer than wide. Epandrium brown, fusiform in profile, with brown pilosity, without laterobasal projection; subepandrial sclerite V-shaped, base narrower than cerci; surstylus with apical half yellow with short, yellow setae, base slightly narrower than epandrial height in profile, apex narrow and rounded; cercus at least 1.5× longer than wide, with straight setae ~ 1× as short as length of surstylus, cerci fused basally; anal lobe indistinct. Hypandrium with arms closed; basiphallus bottle-shaped, slightly longer than distiphallus; distiphallus sclerotized dorsally; pregonite slightly shorter than postgonite; sperm pump indistinct. FEMALE. Unknown. Type material. HOLOTYPE ♂, deposited in LEUA: COLOMBIA, Caquetá, Florencia, Vda.[Vereda] Sucre, 01º52′12″N / 75º40′09″W, 2292 m [eters], 26–28.Sep [IX].2023, Y. Ramos-Pastrana Leg. / Captura con trampa Malaise colocada a nivel de un sistema lótico (al aire) / (LEUA-67353). PARATYPES: same data as holotype (69 ♂ LEUA-67354–67422). Etymology. The specific epithet “ ruidosa ”, refers to the name “Reserva Natural y Ecoturística La Ruidosa”, the locality where the new species was collected. The name is treated as a noun in apposition. Geographical occurrence. Colombia (Caquetá, Florencia) (Fig. 25). Habitat. The specimens were collected in a Malaise trap placed over a creek in the low montane rainforest with dense secondary vegetation in the Andean-Amazonian transition corridor of Colombia (CAM 2018) (Fig. 26).