Exechia longilobata 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 longilobata Lindemann sp. n.

Materials

Type status: Holotype. Occurrence: catalogNumber: TSZD-JKJ-102235 ; recordedBy: Bo W. Svensson et al.; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate microvial; Location: country: Sweden; county: Skåne; municipality: Malmö; locality: Limhamns kalkbrott ; verbatimElevation: - 40 m; decimalLatitude: 55.5681; decimalLongitude: 12.9241; Event : samplingProtocol: Malaise Trap; eventDate: 2011-11-15; habitat: Limestone quarry; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-259573 ; recordedBy: B. W. Svensson & Co.; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate microvial; Location: country: Sweden; county: Skåne; municipality: Malmö; locality: Limhamns kalkbrott ; verbatimElevation: - 40 m; locationRemarks: MT 1 - "grafitti"; decimalLatitude: 55.56826; decimalLongitude: 12.92408; Event : samplingProtocol: Malaise trap; eventDate: 2011-11-01 / 2011-11-30; habitat: Limestone quarry; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: SPM-054527 ; recordedBy: Bo W. Svensson et al.; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate microvial; Location: country: Sweden; county: Skåne; municipality: Malmö; locality: Limhamns kalkbrott ; verbatimElevation: - 40 m; locationRemarks: MT2 - "planen"; decimalLatitude: 55.5681; decimalLongitude: 12.9241; Event : samplingProtocol: Malaise Trap; eventDate: 2009-04-23 / 2009-05-10; habitat: Limestone quarry; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: SPM-058935 ; recordedBy: Bo W. Svensson et al.; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate microvial; Location: country: Sweden; county: Skåne; municipality: Malmö; locality: Limhamns kalkbrott ; verbatimElevation: - 40 m; decimalLatitude: 55.56826; decimalLongitude: 12.92408; Event : samplingProtocol: Malaise trap; eventDate: 2012-02-29 / 2012-03-30; habitat: Limestone quarry; Record Level: institutionCode: TMU

Description

Male (n = 4): Body length 3.0-3.1 mm. Wing length 2.5 mm. Colouration (Dry specimen). Head, face and clypeus dark brown; labellum yellow; palpus yellow. Antenna with scape and pedicel yellow; flagellum yellow. Thorax with scutum and lateral sclerites brown; propleura pale brown; halteres whitish-yellow, apically slightly darker. Legs yellow. Abdomen brown with tergite II slightly paler or with pale area covering its ventral half. Terminalia yellow. Head. Frons, vertex and clypeus covered with pale setae. Antenna short, 1.53-1.64 times as long as length from vertex to ventral margin of clypeus; flagellomeres quadrate, with sixth flagellomere 0.9-0.95 times as long as wide. Thorax. Scutum covered with pale setae. Legs. Fore leg with tibia 0.96-1.1 times as long as first tarsomere. Mid-tibia (n = 1) with 19 anterior, 4 posterodorsal, 7 posterior and 2 posteroventral bristles. Hind tibia (n = 1) with 7 anterodorsal and 2 posterodorsal bristles. Wings. Vein r-m 2.5-3.1 times longer than stem of M-fork. Abdomen. Tergites covered with pale setae. Terminalia (Fig. 25). Each part of divided tergite IX with about 7-9 setae, most apical seta stout. GL with length 0.4-0.54 of gonocoxite width, apico-internal margin slightly angled exteriorly, basal third covered with setae, apex with 3 setae (Fig. 25 a, b). Aedaegal guides somewhat elongated, evenly tapered, acute apex (Fig. 25 a, b). Hypandrium covered with 25-31 setae, with the apical pair reaching about two-thirds of GL (Fig. 25 a, b). Hypandrial lobe with each branch with apical half distinctly widened with apex somewhat acute (Fig. 25 a, b). Gonostylus with DB (Fig. 25 c) 3.0-3.2 times longer than broad, slightly curved interiorly; apical lobe well defined, elongated, narrow, apex rounded; evenly covered with setae on dorsal side, except on most apical part; medio-external margin forming distinct angle, with row of 4 elongate setae. VB apically rounded 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. spatulata in having the dorsal gonostylus branch more narrow, not spathulate, only 3-3.2 times longer than broad (Fig. 25 c), the hypandrium more setose with 25-31 setae (Fig. 25 a), each part of the hypandrial lobe with apical half expanded to a wide disc (Fig. 25 a), the aedaegal guides evenly tapered (Fig. 25 a) and the gonocoxal lobe length only 0.4-0.52 times the gonocoxite width (Fig. 25 a, b); from other species in the E. parva group in having the dorsal gonostylus branch more elongate (Fig. 25 c), the hypandrial lobe with apical half of each branch widened (Fig. 25 a) and the gonocoxal lobes with apico-internal margin slightly angled exteriorly (Fig. 25 a).

Etymology

From Latin longus, long and lobatus, with lobes, relating to the long apical part of the dorsal branch of the gonostylus.

Distribution

West Palaearctic, Sweden (Fig. 15 )

Biology

Adults collected in limestone quarry.

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).