Exechia sphaerata 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 sphaerata Lindemann sp. n.

Materials

Type status: Holotype. Occurrence: catalogNumber: BIOUG03526-D01 ; recordedBy: BIOBus 2012; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned; Location : country: Canada; stateProvince: Alberta; locality: Banff National Park , Storm Mountain , Adjacent to train track and Bow River ; verbatimElevation: 1462 m; decimalLatitude: 51.282; decimalLongitude: -115.944; Event : samplingProtocol: Intercept Trap; eventDate: 2012-06-20; habitat: Forest; fieldNotes: 1 Intercept Trap |mostly cloudy and 16C when site was dismantled|low alpine dry slope, temperate forest; Record Level: institutionCode: CBG Type status: Paratype. Occurrence: catalogNumber: BIOUG09297-H08 ; recordedBy: BIOBus 2012; individualCount: 1; sex: female; lifeStage: adult; preparations: Pinned; 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: Pan Trap; eventDate: 2012-07-21; habitat: Forest; fieldNotes: 10 pan traps |overcast|16C|birch and spruce forest on a slope, lots of fallen logs; Record Level: institutionCode: CBG Type status: Paratype. Occurrence: catalogNumber: BIOUG06332-G11 ; recordedBy: BIOBus 2012; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned; Location : country: Canada; stateProvince: Alberta; locality: Banff National Park , Baker Creek picnic area, Adjacent to hydro line ; verbatimElevation: 1500 m; decimalLatitude: 51.35; decimalLongitude: -116.063; Event : samplingProtocol: Sweep Net; eventDate: 2012-07-27; habitat: Forest ; fieldNotes: standard 5 min sweeping (3), 4 sweepers|partly cloudy| Mature forest , lodgepole pine, temperate forest; Record Level : institutionCode: CBG Type status: Paratype. Occurrence: catalogNumber: BIOUG13692-D07 ; recordedBy: BIObus 2013; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned; Location : country: Canada; stateProvince: New Brunswick; locality: Fundy National Park , Maple Grove Trail ; verbatimElevation: 212 m; decimalLatitude: 45.59; decimalLongitude: -64.985; Event : samplingProtocol: Intercept Trap; eventDate: 2013-05-30; habitat: Forest; fieldNotes: 1 Intercept Trap |overcast|hardwood forest, maple stand; Record Level: institutionCode: CBG Type status: Paratype. Occurrence: catalogNumber: BIOUG27489-F12 ; recordedBy: BIObus 2014; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned; Location : country: Canada; stateProvince: Yukon Territory; locality: Kluane National Park and Reserve , Dezadeash River Trail ; verbatimElevation: 582 m; decimalLatitude: 60.748; decimalLongitude: -137.513; Event : samplingProtocol: Intercept trap; eventDate: 2014-07-24; habitat: Wetland; fieldNotes: 1 Intercept Trap |cold and overcast on day of collection|Wetland with grasses and shrubs; Record Level: institutionCode: CBG Type status: Paratype. Occurrence: catalogNumber: BIOUG13825-B01 ; recordedBy: BIObus 2013; individualCount: 1; sex: female; lifeStage: adult; preparations: Pinned; Location : country: Canada; stateProvince: New Brunswick; locality: Fundy National Park , Maple Grove Trail ; verbatimElevation: 212 m; decimalLatitude: 45.59; decimalLongitude: -64.985; Event : samplingProtocol: Sweep Net; eventDate: 2013-05-28; habitat: Forest; fieldNotes: 5 min sweep x4 collectors (3)|sunny and clear skies|hardwood forest, maple stand; Record Level: institutionCode: CBG Type status: Paratype. Occurrence: catalogNumber: BIOUG09168-H01 ; recordedBy: BIOBus 2012; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned; 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: Intercept Trap; eventDate: 21-Jul-2012; habitat: Forest; fieldNotes: 1 intercept trap |overcast|16C|birch and spruce forest on a slope, lots of fallen logs; Record Level: institutionCode: CBG Type status: Paratype. Occurrence: catalogNumber: BIOUG09164-G05 ; recordedBy: BIOBus 2012; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned; 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: Intercept Trap; eventDate: 21-Jul-2012; habitat: Forest; fieldNotes: 1 intercept trap |overcast|16C|birch and spruce forest on a slope, lots of fallen logs; Record Level: institutionCode: CBG Type status: Paratype. Occurrence: catalogNumber: BIOUG06581-B12 ; recordedBy: BIOBus 2012; individualCount: 1; sex: female; lifeStage: adult; preparations: Pinned; 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: 14-Jul-2012; habitat: Forest; fieldNotes: 1 intercept trap |partly cloudy|24C|white spruce and poplar forest; Record Level: institutionCode: CBG Type status: Paratype. Occurrence: catalogNumber: BIOUG06898-F06 ; recordedBy: BIOBus 2012; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned; Location : country: Canada; stateProvince: Alberta; locality: Elk Island National Park , Elk Island Parkway ; verbatimElevation: 729 m; decimalLatitude: 53.663; decimalLongitude: -112.823; Event : samplingProtocol: Intercept Trap; eventDate: 03-Jul-2012; habitat: Forest; fieldNotes: 1 intercept trap |overcast|14C on end date|black spruce stand; Record Level: institutionCode: CBG Type status: Paratype. Occurrence: catalogNumber: BIOUG09340-D09 ; recordedBy: BIOBus 2012; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned; 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: Pan Trap; eventDate: 21-Jul-2012; habitat: Forest; fieldNotes: 10 pan traps |overcast|16C|birch and spruce forest on a slope, lots of fallen logs; Record Level: institutionCode: CBG Type status: Paratype. Occurrence: catalogNumber: BIOUG09340-B10 ; recordedBy: BIOBus 2012; individualCount: 1; sex: female; lifeStage: adult; preparations: Pinned; 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: Pan Trap; eventDate: 21-Jul-2012; habitat: Forest; fieldNotes: 10 pan traps |overcast|16C|birch and spruce forest on a slope, lots of fallen logs; Record Level: institutionCode: CBG Type status: Paratype. Occurrence: catalogNumber: BIOUG13692-A05 ; recordedBy: BIObus 2013; individualCount: 1; sex: female; lifeStage: adult; preparations: Pinned; Location : country: Canada; stateProvince: New Brunswick; locality: Fundy National Park , Maple Grove Trail ; verbatimElevation: 212 m; decimalLatitude: 45.59; decimalLongitude: -64.985; Event : samplingProtocol: Intercept Trap; eventDate: 30-May-2013; habitat: Forest; fieldNotes: 1 Intercept Trap |overcast|hardwood forest, maple stand; Record Level: institutionCode: CBG

Description

Male (n = 8): Body length 2.7-3.6 mm. Wing length 2.3-2.9 mm. Colouration (Dry specimen). Head brown to dark brown; face and clypeus dark brown; labellum yellow to pale brown; palpus yellow. Antenna with scape and pedicel yellow; flagellum pale brown to dark brown. Thorax with scutum and lateral sclerites brown; propleura brown to dark brown; halteres whitish-yellow to yellow. Legs whitish-yellow to yellow. Abdomen dark brown, sometimes with a pale area covering basolateral part of tergite III. Terminalia yellow. Head. Frons, vertex and clypeus covered with pale setae. Antenna (n = 6) 1.8-2.0 times as long as length from vertex to ventral margin of clypeus; flagellomeres slightly longer than broad, with sixth flagellomere (n = 6) 1.0-1.1 times as long as wide. Thorax. Scutum covered with pale setae. Legs. Fore leg with tibia (n = 5) 1.0-1.05 times as long as first tarsomere. Mid-tibia with (n = 5) 16-19 anterior, (n = 5) 3-4 posterodorsal, (n = 5) 5-7 posterior and (n = 5) 1-3 posteroventral bristles. Hind tibia with 7-9 anterodorsal, 4 posterodorsal and 3-6 posterior bristles. Wings. Vein r-m (n = 6) 2.1-2.4 times longer than stem of M-fork. Abdomen. Tergites covered with pale setae. Terminalia (Fig. 37 a, b, c). Each part of divided tergite IX with about 7-8 setae, most apical seta stout. GL with length 0.51-53 of gonocoxite width; apico-internal margin slightly angled exteriorly; basal third covered with setae; apex with 4 setae. Aedaegal guides short with acute apex. Hypandrium covered with 9-12 setae, with apical pair reaching two-thirds to three-fourths of GL (Fig. 37 a, b). Hypandrial lobe with each branch slender, evenly tapered. Gonostylus (Fig. 37 c) with DB 1.9-2.1 times longer than broad, distinctly curved interiorly, apical part broad, apex rounded; evenly covered with setae on dorsal side, except on most apical part; external margin evenly rounded with row of 5 elongated setae. VB round, with 2 small setae. IB apically with 1 seta close to apex and pair of setae one-third from apex. MB apically acute, with 1 seta close to base.

Female (n =): Body length 2.9-3.7 mm. (n = 3) Wing length 2.5-2.9 mm. Colouration (Dry specimen). Head, face and clypeus dark brown; labellum and palpus yellow. Antenna with scape and pedicel yellow; flagellum brown. Thorax with scutum and propleura brown; lateral sclerites dark brown; halteres whitish-yellow. Legs yellow. Abdomen brown, tergites III-VI with lateral pale areas. Terminalia yellow. Head. Frons, vertex and clypeus covered with pale setae. Antenna (n = 3) 1.75-1.9 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 = 4) 1.0-1.05 times as long as first tarsomere. Mid-tibia with (n = 3) 16-19 anterior, (n = 1) 4 posterodorsal, (n = 1) 5 posterior and (n = 1) 2 posteroventral bristles. Hind tibia with (n = 3) 7-9 anterodorsal, (n = 3) 4-5 posterodorsal and (n = 3) 4-5 posterior bristles. Wings. Vein r-m (n = 3) 2.1-2.4 times longer than stem of M-fork. Abdomen. Tergites covered with pale setae. Terminalia (Fig. 37 d, e, f). Cerci with apical segment 0.6 times as long as basal segment. Tergite VIII with apicolateral margin forming distinctly protruding angle (Fig. 37 d). Sternite VII with apex very slightly protruding. Sternite VIII (Fig. 37 e) with hypogynal valves separated by narrow cleft with depth about one-third of sternite VIII length; apical seta 0.55-0.6 of sternite VIII length. Gonapophysis IX (Fig. 37 f) with basolateral part expanding in obtuse angle; spermathecal eminence trilobed, in ventral view appearing cross-shaped; apically with 4 small setae.

Diagnosis

Distinguished from E. repandoides in having the dorsal branch of the gonostylus with apex rounded (Fig. 37 c), apicoventrally without a short angular projection, in combination with the hypandrium with 9-12 setae (Fig. 37 a, b); from E. brevilobata and E. breviflagellata in having the antennae 1.8-2.0 times as long as length from vertex to ventral margin of clypeus, in combination with the dorsal gonostylus branch without a distinct apical lobe (Fig. 37 c); from other species in the E. parva group in having the dorsal gonostylus branch short and rounded (Fig. 37 c), in combination with apico-internal margin of the gonocoxal lobe slightly angled exteriorly (Fig. 37 a, b).

Etymology

From Latin sphaera, sphere, relating to the shape of the dorsal branch of the gonostylus.

Distribution

Nearctic, Canada (Fig. 13 )

Biology

Adults collected in different types of forest and wetland habitats.

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).