Exechia toyoheii 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 toyoheii Lindemann sp. n.

Materials

Type status: Holotype. Occurrence: catalogNumber: TSZD-JKJ-109250 ; recordedBy: J. Kjærandsen; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate microvial; Location: island: Hokkaido ; country: Japan; stateProvince: Hokkaido Prefecture; locality: Kamikawa-cho , Hakuun-bashi , Ishikari River , Shirakawa ; verbatimElevation: 398 m; locationRemarks: Site 4; decimalLatitude: 43.81722; decimalLongitude: 142.84556; Event : samplingProtocol: sweep net; eventDate: 2006-10-06; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-233423 ; recordedBy: J. Kjærandsen; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned , with genitalia in glycerine in separate microvial; Location : island: Hokkaido; country: Japan; stateProvince: Hokkaido Prefecture; locality: Kushiro-shi , Middle reach of Ibeshibetsu River near Lake Akan , Akan-cho ; verbatimElevation: 448 m; locationRemarks: Site 3; decimalLatitude: 43.48806; decimalLongitude: 144.14778; Event: samplingProtocol: sweep net; eventDate: 2006-10-04; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-111551 ; recordedBy: O. Yata; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate microvial; Location: island: Kyushu ; country: Japan; stateProvince: Fukuoka Prefecture; locality: Nogochi ; Event : eventDate: 1975-05-13; Record Level : institutionCode: KUEC Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-111549 ; recordedBy: T. Saigusa; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate microvial; Location: island: Kyushu ; country: Japan; stateProvince: Miyazaki Prefecture; locality: Kobayashi , Inokodanibashi 2, 400m upstream ; verbatimElevation: 395- 370 m; Event : eventDate: 2004-11-26; Record Level: institutionCode: KUEC Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-111550 ; recordedBy: T. Saigusa; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate microvial; Location: island: Kyushu ; country: Japan; stateProvince: Miyazaki prefecture; locality: Kobayashi , Suki-son , Inokodanibashi 3 ; verbatimElevation: 385 m; Event : eventDate: 2004-12-15; Record Level: institutionCode: KUEC Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-232386 ; recordedBy: J. Kjærandsen; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned , with genitalia in glycerine in separate microvial; Location : island: Hokkaido; country: Japan; stateProvince: Hokkaido Prefecture; locality: Chitose-shi , Kokeno-domon Gallary beside Lake Shikotsu ; verbatimElevation: 279 m; decimalLatitude: 42.71194; decimalLongitude: 141.32111; Event: samplingProtocol: sweep net; eventDate: 2006-10-02; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-109247 ; recordedBy: J. Kjærandsen; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned , with genitalia in glycerine in separate microvial; Location : island: Hokkaido; country: Japan; stateProvince: Hokkaido Prefecture; locality: Kushiro-shi , Middle-lower reach of Ibeshibetsu River near Lake Akan , Akan-cho ; verbatimElevation: 427 m; locationRemarks: Site 2; decimalLatitude: 43.48083; decimalLongitude: 144.13917; Event: samplingProtocol: sweep net; eventDate: 2006-10-04; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-109248 ; recordedBy: J. Kjærandsen; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned , with genitalia in glycerine in separate microvial; Location : island: Hokkaido; country: Japan; stateProvince: Hokkaido Prefecture; locality: Kamikawa-cho , Hakuun-bashi , Ishikari River , Shirakawa ; verbatimElevation: 398 m; locationRemarks: Site 4; decimalLatitude: 43.81722; decimalLongitude: 142.84556; Event: samplingProtocol: sweep net; eventDate: 2006-10-06; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-109249 ; recordedBy: J. Kjærandsen; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned , with genitalia in glycerine in separate microvial; Location : island: Hokkaido; country: Japan; stateProvince: Hokkaido Prefecture; locality: Kamikawa-cho , Hakuun-bashi , Ishikari River , Shirakawa ; verbatimElevation: 398 m; locationRemarks: Site 4; decimalLatitude: 43.81722; decimalLongitude: 142.84556; Event: samplingProtocol: sweep net; eventDate: 2006-10-06; Record Level: institutionCode: TMU

Description

Male (n = 9): Body length (n = 8) 3.5-3.9 mm. Wing length 2.9-3.4 mm. Colouration (Dry specimen). Head dark brown; face and clypeus dark brown to pale brown; labellum yellow, sometimes pale brown; palpus yellow to pale brown, segments 4 and 5 usually somewhat darker. Antenna with scape and pedicel yellow; flagellum dark brown to pale brown, basal part of first flagellomere yellow. Thorax with scutum dark brown to brown, anterolateral margin paler; lateral sclerites pale brown to dark brown; propleura pale brown to brown; halteres whitish-yellow. Legs whitish-yellow to yellow, coxa sometimes slightly darker. Abdomen dark brown, tergites II-III with a yellow laterodorsal area. Terminalia brown with MB and internal lobe of DB dark brown (Fig. 39 b). Head. Frons and vertex covered with short, dark brown to pale brown setae. Clypeus covered with pale setae. Antenna (n = 3) 1.9-2.1 times length from vertex to ventral margin of clypeus; flagellomeres quadrate or longer than broad; sixth flagellomere (n = 6) 1.0-1.2 times as long as wide. Thorax. Scutum covered with short, dark brown to pale brown setae. Legs. Fore leg with tibia (n = 8) 0.77-0.85 times length of first tarsomere. Mid-tibia with (n = 8) 22-28 anterior, (n = 8) 4-6 posterodorsal, (n = 6) 12-15 posterior and (n = 6) 4-7 posteroventral bristles. Hind tibia with 10-14 anterodorsal, 5-7 posterodorsal and 5-10 posterior bristles. Wings. Vein r-m (n = 3) 2.4-3.3 times longer than stem of M-fork. Abdomen. Tergites covered with long, pale brown to brown setae. Terminalia (Figs 2 a, 39). Each part of divided tergite IX apically with about 4-6 setae, 1-2 most apical setae stout. Apicoventral margin of each gonocoxite forming short protrusion between GL and hypandrium, each with stout apical seta. GL (Fig. 39 a, b) relatively narrow, length about one-third of gonocoxite width, apex with 3 elongate setae, otherwise bare. Aedaegal guides elongate and acute. Hypandrium covered with 11-13 setae, with apical pair very short, hardly reaching beyond apical margin of gonocoxites (Fig. 39 a, b). Hypandrial lobe with each branch elongate, narrow, apically abruptly curved interiorly, apex rounded. Gonostylus (Fig. 39 c) with DB short and rounded, forming large and darkened internal lobe; evenly covered with setae on dorsal side, except on the internal lobe; apically with 4-6 elongate setae. VB large, apically acute; with 1 elongate seta on the apex and 3 smaller setae further down, one distinctly wider than others. IB apically with 1 seta on apex and row of 4 setae on small elevation one-third from apex. MB with apex truncate; internal margin forming elongate acute process extending interiorly; apex with row of 3-4 elongated setae sometimes with slightly widened apex, all longer than MB length.

Female: Unknown.

Diagnosis

Distinguished from E. rohdendorfi in having the hypandrium with a short apical pair of setae (Fig. 39 a, b), in combination with the apicoventral gonocoxal margin with a pair of protrusions, each with a stout apical setae (Fig. 39 a, b), the internal branch of the gonostylus with subapical row of setae placed at a greater distance from the apical setae (Fig. 39 c) and by the shape of the dorsal and medial branch of the gonostylus (Fig. 39 c); from E. crassiseta and E. trunciseta in having a short dorsal gonostylus branch with a large darkened internal lobe (Fig. 39 c); from other species in the E. parva group in having a darkened medial gonostylus branch with 3-4 apical setae, all of which are as long as or longer than the medial gonostylus branch length (Fig. 39 c).

Etymology

Named in honour of Professor Emeritus Toyohei Saigusa, the collector of two of the paratypes, who also provided us with the loan of other invaluable material of several species described in this revision.

Distribution

East Palaearctic, Japan (Fig. 10 )

Biology

Unknown

Figures

Figure 10. Distribution map of species in the E. parva group occurring in the East 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).