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 trunciseta Lindemann sp. n. Materials Type status: Holotype . Occurrence : catalogNumber: TSZD-JKJ-111562 ; recordedBy: T. Saigusa ; individualCount: 1 ; sex: male ; lifeStage: adult ; preparations: Pinned , with genitalia in glycerine in separate microvial; Location : country: Bhutan ; stateProvince: Thimpu District ; locality: East of Dochhu La ; verbatimElevation: 2700 m ; decimalLatitude: 27.487778 ; decimalLongitude: 89.762222 ; Event : eventDate: 1993-08-16 ; Record Level: collectionCode: KUEC Description Male: Wing length 3.3 mm. Colouration (Dry specimen). Head, face and clypeus dark brown; labellum yellow; palpus yellow with segments 4 and 5 pale brown. Antenna with scape and pedicel yellow; flagellum dark brown, basal half of first flagellomere yellow. Scutum dark brown with yellow anterolateral margin; lateral sclerites and propleura brown; halteres whitish-yellow. Legs yellow. Abdomen dark brown, tergites II-III with a yellow laterodorsal area. Terminalia brown with MB dark brown (Fig. 40 b ). Head . Frons and vertex covered with short, brown setae. Clypeus covered with pale setae. Thorax . Scutum covered with short, brown setae. Legs . Fore leg with tibia 0.72 times length of first tarsomere. Mid-tibia with 23 anterior, 5 posterodorsal, 11 posterior and 3 posteroventral bristles. Hind tibia with 10 anterodorsal, 5 posterodorsal and 5 posterior bristles. Abdomen. Tergites covered with brown setae. Terminalia (Fig. 40 ). Each part of divided tergite IX with about 4 setae, most apical seta stout. Apicoventral margin of each gonocoxite forming short protrusion between the GL and hypandrium, each with 2 very stout setae, most apical seta distinctly truncated. GL (Fig. 40 a , b ) about one-third of gonocoxite width, apex with 2-3 relatively stout setae. Aedaegal guides elongate and apically acute, converging (Fig. 40 a ). Hypandrium covered with about 6 setae, with apical pair very short, length about half GL length (Fig. 40 a , b ). Hypandrial lobe with each branch elongate, slender, evenly tapered, apex acute. Gonostylus (Fig. 40 c ) with DB elongate and apically rounded; baso-internally forming small lobe, extending interiorly; evenly covered with relatively stout seta on dorsal side, except on most basal part and on internal lobe; apically with about 4 very stout and apically truncated setae. VB apically acute with 1 elongated seta on apex and 4 smaller setae further down, one distinctly wider than the others. IB apically with 1 seta on apex and row of 4 setae on elevation one-sixth from apex. MB wide, elongate, apex acute, baso-internally forming short distinctly right-angled process, apico-internally with row of 4 elongated setae, all about as long as MB length. Female: Unknown Diagnosis Distinguished from E. crassiseta by the shape of the medial gonostylus branch (Fig. 40 c ); from other species in the E. parva group in having the dorsal gonostylus branch basolaterally forming a short lobe and apically with a row of 4 stout truncated setae (Fig. 40 c ), in combination with a dark medial gonostylus branch (Fig. 40 b ), apically with a row of 4 elongated setae, all about as long as the medial gonostylus branch length (Fig. 40 c ). Etymology From Latin truncatus , truncated and seta , bristle, relating to the shape of the seta on posteroventral margin of the gonocoxites and on apical margin of the dorsal lobe of the gonostylus. Distribution Oriental, Nepal (2700 m a.s.l., Fig. 19 ) Biology Unknown.