Exechia capillata Johannsen, 1912

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 capillata Johannsen, 1912

Exechia capillata Johannsen, 1912:73 ♂♀ ( Johannsen 1912)

Materials

Type status: Holotype. Occurrence: catalogNumber: TTG-TBB-2046; recordedBy: O. A. Johannsen; individualCount: 1; sex: male; lifeStage: adult; preparations: Slide mounted in canada balsam, terminalia in glycerine in micro-vial; Record Level: institutionCode: CUIC Type status: Other material. Occurrence: catalogNumber: BIOUG04555-G02 ; recordedBy: Brett Sarchuk; individualCount: 1; sex: female; lifeStage: adult; preparations: Pinned , with genitalia in glycerine in separate microvial; Location : country: Canada; stateProvince: Alberta; locality: Elk Island National Park , Astotin Lake , The Point , near administration/warden office ; verbatimElevation: 719 m; decimalLatitude: 53.685; decimalLongitude: -112.86; Event : samplingProtocol: Malaise Trap; eventDate: 2012-09-14; habitat: Forest; fieldNotes: peninsula, emergent white birch/willow/trembling aspen; Record Level: institutionCode: CBG Type status: Other material. Occurrence: catalogNumber: BIOUG11733-G07 ; recordedBy: Bernard Martin; individualCount: 1; sex: female; lifeStage: adult; preparations: Pinned , with genitalia in glycerine in separate microvial; Location : country: Canada; stateProvince: New Brunswick; locality: Kouchibouguac National Park , Near Park Compound , behind Research House ; verbatimElevation: 61 m; decimalLatitude: 46.7707; decimalLongitude: -65.0064; Event : samplingProtocol: Malaise Trap; eventDate: 2013-09-27; habitat: Forest; fieldNotes: 2 Malaise Traps |mixed forest; Record Level: institutionCode: CBG Type status: Other material. Occurrence: catalogNumber: 10BBCDIP-0557 ; recordedBy: BIObus 2010; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate microvial; Location: country: Canada; stateProvince: British Columbia; locality: Kootenay NP, Redstreak Campground ; verbatimElevation: 1018 m; decimalLatitude: 50.627; decimalLongitude: -116.055; Event: samplingProtocol: Pan Trap; eventDate: 2010-07-30; habitat: Mixed Habitat; fieldNotes: 10 Yellow Pans||Mixed coniferous and grasses; Record Level: institutionCode: CBG Type status: Other material. Occurrence: catalogNumber: BIOUG21428-G08 ; recordedBy: M.Otway; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate microvial; Location: country: Canada; stateProvince: Saskatchewan; locality: Grasslands National Park , East Block ; verbatimElevation: 889 m; decimalLatitude: 49.001; decimalLongitude: -106.557; Event : samplingProtocol: Malaise Trap; eventDate: 2014-10-01; habitat: Grassland; fieldNotes: 2 Malaise traps |In shrubland habitat, along a corridor of shrubs in a coulee; Record Level: institutionCode: CBG Type status: Other material. Occurrence: catalogNumber: BIOUG31068-C05 ; recordedBy: Amy Audoux; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned , with genitalia in glycerine in separate microvial; Location : country: Canada; stateProvince: New Brunswick; municipality: Fredericton ; locality: Devon Middle School ; verbatimElevation: 13 m; locationRemarks: EQP-CLL-911; decimalLatitude: 45.9686; decimalLongitude: -66.624; Event : samplingProtocol: Malaise Trap; eventDate: 2016-09-30; Record Level: institutionCode: CBG Type status: Other material. Occurrence: catalogNumber: BIOUG31108-D02 ; recordedBy: Derek Lindskoog; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned , with genitalia in glycerine in separate microvial; Location : country: Canada; stateProvince: Alberta; municipality: Edmonton ; locality: Highlands School ; verbatimElevation: 658 m; locationRemarks: EQP-CLL-905; decimalLatitude: 53.5707; decimalLongitude: -113.433; Event : samplingProtocol: Malaise Trap; eventDate: 2016-09-30; Record Level: institutionCode: CBG Type status: Other material. Occurrence: catalogNumber: BIOUG05792-H02 ; recordedBy: BIOBus 2012; individualCount: 1; sex: female; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate microvial; Location : country: Canada; stateProvince: Alberta; locality: Jasper National Park , Pocahontas Campground ; verbatimElevation: 1131 m; locationRemarks: Site C 21; decimalLatitude: 53.195; decimalLongitude: -117.914; Event: samplingProtocol: Pitfall Trap; eventDate: 06/14/2012; habitat: Forest; fieldNotes: 10 pitfall traps |birch and spruce forest on a slope, lots of fallen logs; Record Level: institutionCode: CBG Type status: Other material. Occurrence: catalogNumber: BIOUG06581-D12 ; recordedBy: BIOBus 2012; individualCount: 1; sex: female; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate microvial; Location : country: Canada; stateProvince: Saskatchewan; locality: Prince Albert National Park , Narrows Peninsula Trail ; verbatimElevation: 530 m; decimalLatitude: 53.9872; decimalLongitude: -106.282; Event : samplingProtocol: Intercept Trap; eventDate: 06/14/2012; habitat: Forest; fieldNotes: 1 intercept trap |partly cloudy|24C|white spruce and poplar forest

Description

Male (n = 4): Body length 2.7-3.5 mm. Wing length 2.4-3.0 mm. Colouration (Dry specimen). Head dark brown; face and clypeus brown to dark brown; labellum brown; palpus yellow. Antenna with scape and pedicel yellow; flagellum brown to dark brown, basal part of first segment pale. Scutum and lateral sclerites brown to dark brown; propleura yellow to dark brown; halteres whitish-yellow; wings hyaline tinged brown. Legs whitish-yellow. Abdomen dark brown, tergites I-III slightly paler, sometimes tergite II with distinct pale lateral area covering ventral half. Terminalia yellow. Head. Frons and vertex covered with pale short setae. Clypeus covered with pale setae, evenly distributed. Antenna (n = 2) 2.0-2.1 times as long as length from vertex to ventral margin of clypeus; flagellomeres quadrate or slightly longer than broad, sixth flagellomere 1.0-1.15 times as long as wide. Thorax. Scutum covered with pale setae. Legs. Fore leg with tibia (n = 2) 0.9-0.94 times as long as first tarsomere. Mid-tibia with 15-19 anterior, 4-5 posterodorsal, 5-7 posterior and 2-4 posteroventral bristles. Hind tibia with (n = 3) 5-7 anterodorsal, (n = 3) 3-5 posterodorsal and (n = 3) 4 posterior bristles. Wings. Vein r-m 2.5-2.9 times longer than stem of M-fork. Abdomen. Tergites covered with pale setae. Terminalia (n =2, Fig. 17 a, b, c). Each part of divided tergite IX with about 3-4 setae, most apical seta stout. Gonocoxites with GL length 0.46-0.48 of gonocoxite width, apico-internal margin slightly angled exteriorly, basal half or basal two thirds covered with setae, apex with 3-4 setae (Fig. 17 a, b). Aedaegal guides short and round (Fig. 17 a, b). Hypandrium covered with 12-13 setae, apical pair reaching about half of GL (Fig. 17 a, b). Hypandrial lobe with each branch slender, evenly tapering. Gonostylus (Fig. 17 c) with DB 2.3-2.45 times longer than broad, basal part square-shaped; apical lobe well defined, elongate, curving ventrally, apex rounded; evenly covered with setae on dorsal side, except on apical lobe; medio-external margin expanded distally, forming short process with row of 4-5 setae. VB with 2 small setae. IB apically with 1 seta close to apex and row of 2-3 setae one-third from apex. MB apex acute, with 1 seta close to base.

Female (n = 4): Body length 2.6-2.7 mm. Wing length 2.2-2.3 mm. Colouration (Dry specimen). Head dark brown; face and clypeus brown to dark brown; labellum brown; palpus yellow. Antenna with scape and pedicel yellow; flagellum brown, basal part of first flagellomere pale. Thorax with scutum brown to dark brown; lateral sclerites brown; propleura pale brown; halteres whitish-yellow; wings hyaline tinged with brown. Legs whitish-yellow. Abdomen pale brown to dark brown, tergites II-VI with lateral pale areas extending somewhat dorsally along anterior margin of tergites III and VI, but not forming any complete band. Terminalia pale brown. Head. Vertex, frons and clypeus covered with pale setae. Antenna (n = 3) 1.8-1.9 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 setae. Legs. Fore leg with tibia (n = 3) 0.95-1.0 times as long as first tarsomere. Mid-tibia with (n = 3) 17-19 anterior, 3-4 posterodorsal, (n = 3) 5-6 posterior and (n = 3) 2-3 posteroventral bristles. Hind tibia with 4-5 anterodorsal, 5-6 posterodorsal and 4 posterior bristles. Wings. Vein r-m (n = 1) 2.4-2.6 times longer than stem of M-fork. Abdomen. Tergites covered with brown setae. Terminalia (Fig. 17 d, e, f). Cerci with apical segment half as long as basal segment. Tergite VIII with apicolateral margin slightly angular or virtually straight (Fig. 17 d). Sternite VII apicoventral margin evenly rounded. Sternite VIII (Fig. 17 e) with hypogynal valves separated by narrow cleft with depth about one-fourth of sternite VIII length; apical seta length 0.6-0.65 of sternite VIII medial length. Gonapophysis IX (Fig. 17 f) with basolateral part expanding in relatively obtuse angle; spermathecal eminence in ventral view appearing simple, unbranched; apically with about 8 small setae.

Diagnosis

Distinguished from all species in the E. parva group in having the dorsal gonostylus branch with the medio-external margin forming a short distally projected process (Fig. 17 c), in combination with the gonocoxal lobe with apico-internal margin slightly angled exteriorly (Fig. 17 a).

Distribution

Nearctic, Canada, USA (Fig. 13 ).

Biology

Reared from fruitbody of Collybia dryophila (Bull.: Fr.) P. Kumm. = Gymnopus dryophilus (Bull.: Fr.) Murrill ( Johannsen 1912). Adults collected in different types of forest, grassland and wetland habitats.

Notes

Holotype with whole specimen, except terminalia mounted on slide in Canada balsam with one wing detached. Terminalia in alcohol, transferred to glycerine and associated with empty pin with labels in type collection. A second tube with terminalia of E. cf. dorsalis misplaced in same vial - this was also transferred to glycerine in a microvial and pinned separately.

Figures

Figure 13. Distribution map of species in the E. parva group occurring in the Nearctic 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).