Exechia rohdendorfi Zaitzev, 1996

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 rohdendorfi Zaitzev, 1996

Exechia rohdendorfi Zaitzev, 1996: 68 ♂ ( Zaitzev 1996)

Materials

Type status: Holotype. Occurrence: catalogNumber: Di0525 ; occurrenceRemarks: Two labels: Label 1 in transliteration:" Sakhalin, Neversk Distr., 20.IX.1986, A. Zaitzev " [in work with original description Neversk Distr. change on more exact place - Kuznetzov Cape]. Label 2: " Holotypus? Exechia rohdendorfi Holotypus det. Zaitzev "; recordedBy: A. Zaitzev; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned ; Location : island: Sakhalin; country: Russia; stateProvince: Sakhalin Oblast; locality: Neversk Distr. , Kuznetzov Cape ; Event : eventDate: 1986-09-20; Record Level: institutionCode: ZMM Type status: Other material. Occurrence: catalogNumber: TSZD-JKJ-109246 ; 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: Other material. Occurrence: catalogNumber: TSZD-JKJ-233424 ; 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: Other material. Occurrence: catalogNumber: TSZD-JKJ-107245 ; 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 , Chitose-gawa at Rankoshi ; verbatimElevation: 45 m; decimalLatitude: 42.805; decimalLongitude: 141.567; Event: samplingProtocol: sweep net; eventDate: 2006-10-02; Record Level: institutionCode: TMU Type status: Other material. Occurrence: catalogNumber: TSZD-JKJ-232387 ; 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 , Chitose-gawa at Rankoshi ; verbatimElevation: 45 m; decimalLatitude: 42.805; decimalLongitude: 141.567; Event: samplingProtocol: sweep net; eventDate: 2006-10-02; Record Level: institutionCode: TMU

Description

Male (n = 4): Body length 3.4-3.6 mm. Wing length 3-3.1 mm. Colouration (Dry specimen). Head brown to dark brown; face yellow to brown; clypeus pale brown; labellum yellow; palpus yellow. Antenna with scape and pedicel yellow; flagellum yellow to brown, first segment with yellow base. Scutum pale brown with a narrow yellow anterolateral margin; lateral sclerites pale brown; propleura whitish-yellow; halteres whitish-yellow, apically slightly darker. Legs whitish-yellow. Abdomen pale brown to brown, tergite III sometimes with a small yellow lateral spot. Terminalia pale brown with MD and apico-internal lobe of DB dark brown (Fig. 33 b). Head. Vertex, frons and clypeus covered with brown setae. Antenna (n = 2) 1.9-2 times as long as length from vertex to ventral margin of clypeus; flagellomeres slightly longer than broad, with sixth flagellomere 1.1 times as long as wide. Thorax. Scutum covered with pale brown setae. Legs. Fore leg with tibia 0.77-0.92 times length of first tarsomere. Mid-tibia with 24 anterior, 4-5 posterodorsal, 9-11 posterior and 6-7 posteroventral bristles. Hind tibia with 14-10 anterodorsal, 6-5 posterodorsal and 6-5 posterior bristles. Wings. Vein r-m (n = 2) 2.7-3.3 times longer than stem of M-fork. Abdomen. Tergites covered with brown setae. Terminalia (Fig. 33). Each part of divided tergite IX with about 2-5 setae, most apical seta stout. GL relatively narrow, length about one-third of gonocoxite width, apex with 2-3 elongate setae, otherwise bare (Fig. 33 a, b). Aedaegal guides narrow, elongate, apex acute (Fig. 33 a). Hypandrium covered with about 6-12 setae, with apical pair reaching about level of GL apex (Fig. 33 a). Hypandrial lobe with each branch elongate, narrow, apically abruptly curved interiorly, apex rounded. Gonostylus (Fig. 33 c) with DB short, wide, forming a large, darkened apico-internal lobe; dorsal side evenly covered with setae, except on apico-internal lobe; apico-externally somewhat acute with 1-2 long setae. VB large, apically acute, with 1 long seta on apex and 3-4 shorter setae further down, one somewhat wider than others. Apical part of IB with 1 seta on the apex and row of 4 setae on shelf close to apex. MB short, wide, apex narrow and truncate, internally forming elongate, more or less acute process extending interiorly; apical margin with 6-7 long setae, all longer than MB length.

Female: Unknown.

Diagnosis

Distinguished from E. toyoheii in having the hypandrium with apical pair of setae elongate (Fig. 33 a), the internal gonostylus branch with apical seta and subapical row of setae close together (Fig. 33 c) and the gonocoxal apicoventral margin without distinct protrusions (Fig. 33 a); from other species in the E. parva group by the dorsal gonostylus branch short with a large darkened internal lobe (Fig. 33 c), in combination with the medial gonostylus branch darkened (Fig. 33 b), apically with a row of 3-4 setae, all of which are longer than the medial gonocoxal branch length (Fig. 33 c).

Distribution

East Palaearctic, Japan, Russia (Fig. 10 )

Biology

Unknown

Taxon discussion

We have recognised one specimen (TSZD-JKJ-108464) with slightly deviating shape of the medial and internal gonostylus branch (Fig. 33 c, d). Taking into consideration the similarity in the CO1 sequence between the two forms, as well as being sympatric, they probably belong to the same species.

Notes

We have studied the holotype, based on images of the terminalia, provided by courtesy of Dr. Andrey Ozerov, Moscow State University. The holotype is in good condition and terminalia not dissected.

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).