Revision of the Exechia parva group (Diptera: Mycetophilidae) Author Lindemann, Jon Peder https://orcid.org/0000-0001-6001-7910 UiT - The Arctic University of Norway, Tromso, Norway jon.p.lindemann@uit.no Author Soli, Geir https://orcid.org/0000-0001-5301-6995 Natural History Museum, Oslo, Norway geir.soli@nhm.uio.no Author Kjaerandsen, Jostein https://orcid.org/0000-0002-3104-073X UiT - The Arctic University of Norway, Tromso, Norway jostein.kjarandsen@uit.no text Biodiversity Data Journal 2021 2021-09-24 9 67134 67134 http://dx.doi.org/10.3897/BDJ.9.e67134 journal article http://dx.doi.org/10.3897/BDJ.9.e67134 1314-2828-9-e67134 A1151C0727B74F31BC4B6809DA6F87CD 54EEB1B3D94E5239B847CC1AD9587A36 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