Exechia repandoides Caspers, 1984

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 repandoides Caspers, 1984

Exechia repandoides Caspers, 1984: 180 ♂ ( Caspers 1984)

Materials

Type status: Holotype. Occurrence: recordedBy: H. Malicky; individualCount: 1; sex: male; lifeStage: adult; preparations: 80% Alcohol ; Location : country: Austria; locality: Teichbach / Lunz ; Event : samplingProtocol: "Emergenzfalle"; eventDate: 1972-09-22; Record Level: institutionCode: ZSMC Type status: Other material. Occurrence: catalogNumber: TSZD-JKJ-211754 ; recordedBy: G. Couturier; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate micro-vial; Location: country: France; county: Île-de-France; municipality: Versaille ; locality: Val d'Or , La Miniere ; decimalLatitude: 48.78; decimalLongitude: 2.08; Event : eventDate: 1970-06-05; habitat: Garden; fieldNotes: "au pied d'une haie"; Record Level: institutionCode: TMU Type status: Other material. Occurrence: catalogNumber: TSZD-JKJ-232387 ; recordedBy: Swedish Malaise Trap Project; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned , with genitalia in glycerine in separate microvial; Location : island: Öland; country: Sweden; county: Kalmar; municipality: Morbylonga ; locality: Gamla Skogsby (Kallstad) ; decimalLatitude: 56.616700; decimalLongitude: 16.507617; Event : samplingProtocol: malaise trap; eventDate: 2003-09-12 / 2003-10-08; habitat: Meadow with bushes; fieldNotes: " diversitets-ängen " / trapID 22; Record Level: institutionCode: TMU Type status: Other material. Occurrence: catalogNumber: TSZD-JKJ-207679 ; recordedBy: H. Andersson & R. Danielsson; individualCount: 1; sex: male; lifeStage: adult; preparations: Slide; Location: island: Öland; country: Sweden; county: Kalmar; municipality: Borgholm; locality: Halltorps Hage ; verbatimElevation: 25m; decimalLatitude: 56.800278; decimalLongitude: 16.576667; Event: samplingProtocol: window trap; eventDate: 1976-08-3 / 1976-08-6; habitat: Oak forest; Record Level : institutionCode: TMU

Description

Male (n = 3): Body length (n = 2) 3.0-3.3 mm. Wing length 2.8 mm. Colouration (Dry specimen; n = 2). Head pale brown to brown; labellum and palpus yellow. Antenna yellow. Scutum pale brown to brown, anterolaterally distinctly paler; lateral sclerites yellow to pale brown; halteres yellow. Legs yellow to whitish-yellow. Abdomen pale brown to brown, tergite II slightly paler. Terminalia pale brown. Head. Frons and vertex and clypeus covered with pale setae. Antenna 1.8-1.95 times as long as length from vertex to ventral margin of clypeus; flagellomeres elongate, with sixth flagellomere 1.25 times longer than broad. Thorax. Scutum covered with pale setae. Legs. Fore leg with tibia 0.96-1.0 times as long as first tarsomere. Mid-tibia with 20-24 anterior, 3-4 posterodorsal, 7-8 posterior and 2-3 posteroventral bristles. Hind tibia (n = 2) with 7-8 anterodorsal, 4-6 posterodorsal and 3-5 posterior bristles. Wings. Vein r-m 2.0-2.3 times longer than stem of M-fork. Abdomen. Tergites covered with pale setae. Terminalia (Fig. 32). Each part of divided tergite IX with 5 setae, most apical setae stout. GL (Fig. 32 a, b) with length 0.54-0.58 of gonocoxite width; apico-internal margin slightly angled exteriorly; basal fourth covered with setae; apex with 3-4 setae. Aedaegal guides short, rounded. Hypandrium covered with 17-21 setae, with apical pair reaching about half of the GL (Fig. 32 a, b). Hypandrial lobe with each branch slender, basal half somewhat widened, apical half narrow. Gonostylus (Fig. 32 c) with DB 2.0-2.4 times longer than broad, distinctly curved interiorly, apical part broad, apex acute, apico-internally with short angular projection; evenly covered with setae on dorsal side, except on most apical part; apico-external margin slightly angled 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. sphaerata in having the dorsal gonostylus branch apico-internally forming a short angular projection (Fig. 32 d) and with the apex acute (Fig. 32 c), in combination with the hypandrium more setose, covered with 17-21 setae (Fig. 32 a, b); from E. brevilobata and E. breviflagellata in having the antennae 1.8-1.95 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. 32 c), and the hypandrium more setose (Fig. 32 a, b); from other species in the E. parva group in having a short dorsal gonostylus branch, 2.0-2.4 times longer than broad (Fig. 32 c), in combination with the gonocoxal lobes with apico-internal margin angled exteriorly (Fig. 32 a, b).

Distribution

West Palaearctic, Austria, Britain, Corsica, Czech Republic, Estonia, France, Germany, Hungary, Italy, Sweden, Switzerland (Fig. 15 , Chandler 2005).

Biology

Reared from fruitbody of Tricholoma sejunctum (Sowerby) Quél. and Cortinarius sp. ( Šedivý and Ševčík 2003, Ševčík 2006). Adults collected in old growth deciduous forest.

Taxon discussion

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

Notes

The pinned specimens have been preserved in alcohol for some years before being dry-mounted and may, therefore, be considerably paler compared to fresh material.

Holotype compared with and found to be conspecific with TSZD-JKJ-207679.

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).