Exechia crassiseta Lindemann, 2021

Lindemann, Jon Peder, Soli, Geir & Kjaerandsen, Jostein, 2021, Revision of the Exechia parva group (Diptera: Mycetophilidae), Biodiversity Data Journal 9, pp. 67134-67134 : 67134

Exechia crassiseta Lindemann sp. n.

Materials

Type status: Holotype. Occurrence: catalogNumber: TSZD-JKJ-111554 ; recordedBy: J. Emoto; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate microvial; Location: country: Nepal; stateProvince: Province no. 1 (Kosi Zone); county: Sankhuwasabha District ; locality: Salpa La ; verbatimElevation: 2900-3000 m; decimalLatitude: 27.450000; decimalLongitude: 86.916667; Event : eventDate: 1981-07-29; Record Level: institutionCode: KUEC

Description

Male: Body length 3.6 mm. Wing length 3.2 mm. Colouration (Dry specimen). Head, face and clypeus dark brown; labellum pale brown; palpus yellow to pale brown. Antenna with scape and pedicel yellow; flagellum dark brown, basal half of first flagellomere yellow. Thorax with scutum dark brown, except narrow yellow anterolateral margin; lateral sclerites dark brown; propleura brown; halteres whitish-yellow. Legs yellow. Abdomen dark brown, tergites II-III with yellow laterodorsal area. Terminalia pale brown with MB dark brown. Head. Frons and vertex covered with brown setae. Clypeus covered with pale setae, most dense towards ventral side; flagellomeres quadrate, with sixth flagellomere as long as broad. Thorax. Scutum covered with brown setae. Legs. Fore leg with tibia 0.7 times length of first tarsomere. Mid-tibia with 23 anterior, 5 posterodorsal, 10 posterior and 5 posteroventral bristles. Hind tibia with 10 anterodorsal, 6 posterodorsal and 4 posterior bristles. Wings. Vein r-m 3.3 times longer than stem of M-fork. Abdomen. Tergites covered with long brown setae. Terminalia (Fig. 22). Each part of divided tergite IX apically with about 4 setae, most apical seta stout. Gonocoxites with apicoventral margin between GL and hypandrium forming short protrusion, each with 2 very stout and apically truncated setae (Fig. 22 a, b); GL apex with 2-3 relatively short and stout setae (Fig. 22 a, b). Aedaegal guides elongate, converging, apically acute (Fig. 22 a). Hypandrium with about 8 setae, apical pair not reaching longer than half the GL length (Fig. 22 a, b). Hypandrial lobe with each branch narrow, evenly tapering, apex acute. Gonostylus (Fig. 22 c) with DB elongate, apex rounded, baso-internally forming small lobe, extending interiorly; dorsal side evenly covered with relatively stout setae, except on most basal part and internal lobe; apically with about 4 very stout and apically truncated setae. VB ovate, apex acute, with 1 elongate seta on apex and 3 smaller setae further down, one distinctly wider than others. Apical part of IB with 1 seta on apex and row of 4 setae on elevation one-fifth from the apex. MB short, apex acute, internal margin forming curved acute process, external margin forming short acute process, apex with row of 4 elongate setae, all longer than MB length.

Female: Unknown.

Diagnosis

Distinguished from E. trunciseta by the shape of the medial gonostylus branch (Fig. 22 c); from other species in the E. parva group in having the dorsal gonostylus branch apically with a row of 4 stout truncate setae, baso-internally with a short lobe (Fig. 22 c) and in having the medial gonostylus branch darkened, apically with a row of 4 setae, all of which are longer than the medial gonostylus branch length (Fig. 22 c).

Etymology

From Latin crassus, stout and seta, bristle, relating to the shape of the seta on apicoventral margin of the gonocoxites and apically on the dorsal branch of the gonostylus.

Distribution

Oriental, Nepal (2900-3000 m a.s.l., Fig. 19 ).

Biology

Unknown

Figures

Figure 19. Distribution map of species in the E. parva group occurring in the eastern Himalayas (Oriental Region), based on localities from studied material, type material and DNA-barcoded material. Different species are represented by individual colours. Altitudes are indicated in shades from grey (lowland) to white (mountains).