Exechia brachiata 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 brachiata Lindemann sp. n.

Materials

Type status: Holotype. Occurrence: catalogNumber: TSZD-JKJ-107226 ; recordedBy: A.H. Kirk-Spriggs; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate microvial; Location: country: Madagascar; stateProvince: Fianarantsoa prov.; locality: Ranomafana NP ; decimalLatitude: -21.2603; decimalLongitude: 47.4186; Event : eventDate: 2007-01-16; Record Level: institutionCode: BMSA

Description

Male: Body length 3.2 mm. Wing length 2.5 mm. Colouration (Dry specimen). Head and face dark brown; clypeus brown; labellum and palpus yellow. Antenna with scape and pedicel yellow; flagellum brown with first flagellomere pale brown. Thorax with scutum and lateral sclerites brown; propleura pale brown; halteres whitish-yellow, apically slightly darker. Legs whitish-yellow. Abdomen dark brown, tergites II-III with lateral yellow area. Terminalia pale brown. Head. Frons and vertex covered with long dark brown setae. Clypeus covered with brown setae, more dense towards ventral side; flagellomeres quadrate, with sixth flagellomere as long as broad. Thorax. Scutum covered with long dark brown setae. Legs. Fore leg with tibia 0.87 times as long as first tarsomere. Mid-tibia with 20 anterior, 5 posterodorsal, 8 posterior and no posteroventral bristles. Hind tibia with 7-8 anterodorsal, 8-9 posterodorsal and 4 posterior bristles. Abdomen. Tergites covered with long dark brown to black setae. Terminalia (Fig. 11). Each part of divided tergite IX apically with about 6 setae, most apical seta stout. Gonocoxites evenly covered with setae, except on basoventral three-fourths (Fig. 11 a, b). Each GL entirely covered with setae, apically with 2 short stout setae (Fig. 11 a, b). Aedaegal guides elongate, basal part wide, evenly tapered, apex acute (Fig. 11 a, b). Hypandrium with row of 4 large setae reaching about half of GL, otherwise bare (Fig. 11 a, b). Hypandrial lobe with basal part large, medial area hyaline or hollow, each branch relatively short, apex rounded (Fig. 11 a, b). Gonostylus (Fig. 11 c) with DB medially broad, tapered towards narrow apical part, apex rounded, base acuminate, baso-internally forming elongated narrow branch about as long as half DB length, extending in almost straight angle and curving distally; apex with three short stout setae, dorsal side evenly covered with setae, except on apical fourth, on baso-internal branch and on baso-external corner. VB ovate, apically as broad as basally, apex rounded, with 2 setae on apical half. IB short; apex trifurcated with middle branch broad and truncated and lateral branches short and acute; apical part with 2 small setae, one seta located on apical side of each furcation and with 1 seta located further down. MB large, curved interiorly, at about half length bifurcated with each branch apically acute; the internal branch straight and about as long as stem, with two small setae located adjacent to apex; external branch shorter, bent interiorly at a right angle.

Female: Unknown.

Diagnosis

Distinguished from all species in the E. parva group in having the dorsal branch of the gonostylus with an elongated and narrow baso-internal lobe extending in an almost straight angle and curving distally (Fig. 11 c), the internal branch of the gonostylus apically trilobed (Fig. 11 c), the medial branches of the gonostylus bilobed (Fig. 11 c) and the hypandrium with a row of 4 large setae (Fig. 11 a, b).

Etymology

From Latin, brachiatus, branched, relating to the shape of the gonostylus with bilobed dorsal and medial branches and trilobed internal branch.

Distribution

Afrotropical, Madagascar (Fig. 4 )

Biology

Unknown.

Figures

Figure 4. Distribution map of species in the E. parva group occurring in the Afrotropical 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).