Exechia brevilobata 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 brevilobata Lindemann sp. n.

Materials

Type status: Holotype. Occurrence : catalogNumber: TSZD-JKJ-102846 ; recordedBy: Rikmyrsprosjektet ; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned (HMDS-dried from ethanol); Location : country: Norway; county: HEN; municipality: Engerdal ; locality: Asen ; decimalLatitude: 61.88586; decimalLongitude: 11.78283; Event: samplingProtocol: window trap; eventDate: 2016-08-18 / 2016-10-27; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-215077 ; recordedBy: K. Müller; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned (HMDS-dried from ethanol); Location : country: Sweden; county: LU; municipality: Jokkmokk ; locality: Messaure ; verbatimElevation: 175; decimalLatitude: 66.68262; decimalLongitude: 20.36322; Event: samplingProtocol: pitfall trap; eventDate: 1972-10-04 / 1973-05-10; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-209230 ; recordedBy: M. Karström; individualCount: 1; sex: male; lifeStage: adult; preparations: 80% alc.; Location : country: Sweden; county: LU; municipality: Jokkmokk ; locality: Porsitjaern / Porsi VVO, 1.5 km SE Vuollerim ; verbatimElevation: 60; decimalLatitude: 66.42444; decimalLongitude: 20.67139; Event: samplingProtocol: Window trap; eventDate: 2004-05-06 / 2004-08-13; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-209181 ; recordedBy: M. Karström; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned (HMDS-dried from ethanol); Location : country: Sweden; county: LU; municipality: Jokkmokk ; locality: Porsitjaern / Porsi VVO, 1.5 km SE Vuollerim ; verbatimElevation: 60; decimalLatitude: 66.42444; decimalLongitude: 20.67139; Event: samplingProtocol: Window trap; eventDate: 2004-05-06 / 2004-08-13; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-205876 ; recordedBy: M. Karström; individualCount: 1; sex: male; lifeStage: adult; preparations: Slide mounted in Canada Balsam ; Location : country: Sweden; county: LU; municipality: Jokkmokk ; locality: Porsitjaern / Porsi VVO, 1.5 km SE Vuollerim (Tussilago-lunden) ; verbatimElevation: 60; decimalLatitude: 66.42444; decimalLongitude: 20.67139; Event: samplingProtocol: window trap; eventDate: 2003-04-14 / 2003-10-18; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-112073 ; recordedBy: M. Karström; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned (HMDS-dried from ethanol); Location : country: Sweden; county: LU; municipality: Jokkmokk ; locality: Porsitjaern / Porsi VVO, 1.5 km SE Vuollerim ; verbatimElevation: 60; decimalLatitude: 66.42444; decimalLongitude: 20.67139; Event: samplingProtocol: Window trap; eventDate: 2004-08-13 / 2004-10-13; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-112074 ; recordedBy: M. Karström; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned (HMDS-dried from ethanol); Location : country: Sweden; county: LU; municipality: Jokkmokk ; locality: Porsitjaern / Porsi VVO, 1.5 km SE Vuollerim ; verbatimElevation: 60; decimalLatitude: 66.42444; decimalLongitude: 20.67139; Event: samplingProtocol: Window trap; eventDate: 2004-08-13 / 2004-10-13; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-112075 ; recordedBy: M. Karström; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned (HMDS-dried from ethanol); Location : country: Sweden; county: LU; municipality: Jokkmokk ; locality: Porsitjaern / Porsi VVO, 1.5 km SE Vuollerim ; verbatimElevation: 60; decimalLatitude: 66.42444; decimalLongitude: 20.67139; Event: samplingProtocol: Window trap; eventDate: 2004-08-13 / 2004-10-13; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-112076 ; recordedBy: M. Karström; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned (HMDS-dried from ethanol); Location : country: Sweden; county: LU; municipality: Jokkmokk ; locality: Porsitjaern / Porsi VVO, 1.5 km SE Vuollerim ; verbatimElevation: 60; decimalLatitude: 66.42444; decimalLongitude: 20.67139; Event: samplingProtocol: Window trap; eventDate: 2004-08-13 / 2004-10-13; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-112077 ; recordedBy: M. Karström; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned (HMDS-dried from ethanol); Location : country: Sweden; county: LU; municipality: Jokkmokk ; locality: Porsitjaern / Porsi VVO, 1.5 km SE Vuollerim ; verbatimElevation: 60; decimalLatitude: 66.42444; decimalLongitude: 20.67139; Event: samplingProtocol: Window trap; eventDate: 2004-08-13 / 2004-10-13; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-112078 ; recordedBy: M. Karström; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned (HMDS-dried from ethanol); Location : country: Sweden; county: LU; municipality: Jokkmokk ; locality: Porsitjaern / Porsi VVO, 1.5 km SE Vuollerim ; verbatimElevation: 60; decimalLatitude: 66.42444; decimalLongitude: 20.67139; Event: samplingProtocol: Window trap; eventDate: 2004-08-13 / 2004-10-13; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-112079 ; recordedBy: M. Karström; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned (HMDS-dried from ethanol); Location : country: Sweden; county: LU; municipality: Jokkmokk ; locality: Porsitjaern / Porsi VVO, 1.5 km SE Vuollerim ; verbatimElevation: 60; decimalLatitude: 66.42444; decimalLongitude: 20.67139; Event: samplingProtocol: Window trap; eventDate: 2004-08-13 / 2004-10-13; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-112080 ; recordedBy: M. Karström; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned (HMDS-dried from ethanol); Location : country: Sweden; county: LU; municipality: Jokkmokk ; locality: Porsitjaern / Porsi VVO, 1.5 km SE Vuollerim ; verbatimElevation: 60; decimalLatitude: 66.42444; decimalLongitude: 20.67139; Event: samplingProtocol: Window trap; eventDate: 2004-08-13 / 2004-10-13; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-112081 ; recordedBy: M. Karström; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned (HMDS-dried from ethanol); Location : country: Sweden; county: LU; municipality: Jokkmokk ; locality: Porsitjaern / Porsi VVO, 1.5 km SE Vuollerim ; verbatimElevation: 60; decimalLatitude: 66.42444; decimalLongitude: 20.67139; Event: samplingProtocol: Window trap; eventDate: 2004-08-13 / 2004-10-13; Record Level: institutionCode: MZLU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-112082 ; recordedBy: M. Karström; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned (HMDS-dried from ethanol); Location : country: Sweden; county: LU; municipality: Jokkmokk ; locality: Porsitjaern / Porsi VVO, 1.5 km SE Vuollerim ; verbatimElevation: 60; decimalLatitude: 66.42444; decimalLongitude: 20.67139; Event: samplingProtocol: Window trap; eventDate: 2004-05-06 / 2004-08-13; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-112083 ; recordedBy: M. Karström; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned (HMDS-dried from ethanol); Location : country: Sweden; county: LU; municipality: Jokkmokk ; locality: Porsitjaern / Porsi VVO, 1.5 km SE Vuollerim ; verbatimElevation: 60; decimalLatitude: 66.42444; decimalLongitude: 20.67139; Event: samplingProtocol: Window trap; eventDate: 2004-05-06 / 2004-08-13; Record Level: institutionCode: MZLU

Description

Male (n = 9): Body length (n = 8) 3.5-3.8 mm. Wing length 2.7-3.2 mm. Colouration (Dry specimen; n = 2). Head brown to dark brown, face and clypeus pale brown to dark brown; labellum yellow to brown; palpus yellow. Antenna with scape and pedicel yellow; flagellum yellow to brown with basal part of first segment pale. Scutum brown to dark brown, anterolateral areas distinctly paler; lateral sclerites pale brown to dark brown, propleura yellow to dark brown; halteres whitish-yellow. Legs yellow. Abdomen brown to dark brown. Terminalia yellow. Head. Frons and vertex covered with whitish to pale brown setae. Clypeus covered with thin pale setae, evenly distributed. Antenna short, 1.5-1.65 times as long as length from vertex to ventral margin of clypeus; flagellomeres quadrate, with sixth flagellomere as long as broad. Thorax. Scutum covered with pale brown setae. Legs. Fore leg with tibia 1.0 times as long as first tarsomere. Mid-tibia with 20-22 anterior, (n = 3) 4 posterodorsal, 8 posterior and 1-2 posteroventral bristles. Hind tibia (n = 3) with 7-8 anterodorsal, 4 posterodorsal and 4-5 posterior bristles. Wings. Vein r-m 2.3-2.5 times longer than stem of M-fork. Abdomen. Tergites covered with pale brown setae. Terminalia (Fig. 14). Each part of divided tergite IX with 5-6 setae, 1-2 most apical stout. Gonocoxites with GL length 0.58-0.63 of gonocoxite width, apico-internal margin slightly angled exteriorly, basal fifth covered with setae, apex with 3-4 setae (Fig. 14 a, b). Aedaegal guides short with acute apex. Hypandrium covered with 10-13 setae, apical pair reaching about half of GL (Fig. 14 a). Hypandrial lobe with each branch slender, evenly tapering. Gonostylus (Fig. 14 c) with DB short, round, 1.8-2.0 times longer than broad, slightly curved interiorly; apical lobe well defined, short and narrow, 0.21-0.25 times as long as the total DB length, apex rounded; evenly covered with setae on dorsal side, except on most apical part; external margin evenly rounded, with row of 4-5 elongate setae. VB round, with 2 small setae. IB apically with 1 seta close to apex and pair of setae one-third from apex. MB apex acute, with 1 seta close to the base.

Female: Unknown.

Diagnosis

Distinguished from E. breviflagellata in having the gonostylus with the dorsal branch 1.8-2 times longer than broad, with its apical lobe narrower and longer, 0.21-0.25 of the total dorsal branch length (Fig. 14 c); from E. sphaerata and E. repandoides in having the antennae only 1.5-1.65 times as long as length from vertex to ventral margin of clypeus, in combination with the apical lobe of the dorsal gonostylus branch well defined (Fig. 14 c); from other species in the E. parva group in having shorter antennae, in combination with apico-internal margin of gonocoxal lobe slightly angled exteriorly.

Etymology

From Latin brevis, short and lobatus, with lobes, relating to the short apical lobe of the dorsal branch of the gonostylus.

Distribution

East Palaearctic, Norway, Sweden (Fig. 15 ).

Biology

Unknown.

Taxon discussion

Material of this species from Jokkmokk, Sweden, have earlier been identified as E. repandoides ( Kjærandsen et al. 2007). The two species may have non-overlapping distributions, with E. brevilobata only recorded from boreal areas and E Exechia repandoides only recorded from nemoral areas.

Figures

Figure 15. Distribution map of species in the E. parva group occurring in the West Palaearctic 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).