Exechia ashleyi 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 ashleyi Lindemann sp. n.

Materials

Type status: Holotype. Occurrence: catalogNumber: TSZD-JKJ-107227 ; occurrenceRemarks: BMSA(D): 26355.; recordedBy: A.H. Kirk-Spriggs; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate microvial; Location: country: Burundi; stateProvince: Kayanza prov.; municipality: Rwegura; locality: Parc National de la Kibira ; verbatimElevation: 2237 m; decimalLatitude: -2.92194; decimalLongitude: 29.5011; Event: samplingProtocol: Malaise trap; eventDate: 2010-11-24; habitat: Indigenous Afromontane forest; Record Level : institutionCode: BMSA

Description

Male: Body length 3.2 mm. Wing length 2.5 mm. Colouration (Dry specimen). Head face and clypeus dark brown, almost black; labellum brown; palpus yellow. Antenna with scape and pedicel yellow; flagellum brown, basal half of first flagellomere yellow. Thorax with scutum dark brown, lateral margin pale brown; lateral sclerites and propleura brown; halteres whitish-yellow, apically slightly darker. Legs whitish-yellow. Abdomen dark brown, tergites II-III with slightly paler lateral area. Terminalia yellow. Head. Frons and vertex covered with long pale brown setae. Clypeus covered with pale setae, evenly distributed; flagellomeres quadrate, with sixth flagellomere as long as broad. Thorax. Scutum covered with long, pale brown setae. Legs. Fore leg with tibia 0.76 times as long as first tarsomere. Mid-tibia with 17 anterior, 4 posterodorsal, 9 posterior and no posteroventral bristles. Hind tibia with 7-8 anterodorsal, 5 posterodorsal and 5 posterior bristles. Abdomen. Tergites covered with long, dark brown setae. Terminalia (Fig. 8). Each part of divided tergite IX apically with about 9 setae, apical stout. Gonocoxites (Fig. 8 a, b) evenly covered with setae, except on basoventral third; setae on apicoventral margin reaching as far as GL apex. Each GL apex with 3 setae (Fig. 8 a, b). Aedaegal guides short, evenly tapered towards acute apex (Fig. 8 a). Hypandrium covered with about 12 setae, apical pair elongate, reaching beyond the GL apex (Fig. 8 a, b). Hypandrial lobe with each branch abruptly curved interiorly, apically narrow, apex rounded (Fig. 8 a). Gonostylus (Fig. 8 c) with DB short, squared, about 2 times longer than broad, apically truncate with apical corners virtually right-angled, apical margin emarginate, dorsal side evenly covered with setae. VB lanceolate, apex with 2 setae, apical seta on apex. IB with apex membranous, acute, apical part with row of 3 setae close to apex. MB short, slender, apex rounded, apically with row of 3 small setae.

Female: Unknown.

Diagnosis

Distinguished from E. penicillata and E. sambai in having the dorsal gonostylus branch short and squared with apico-internal corner right-angled (Fig. 8 c), in combination with setae on apicoventral margin of gonocoxites not reaching beyond the gonocoxal lobe apex (Fig. 8 a) and by the shape of the hypandrial lobe (Fig. 8 a); from E. burundiensis in having the dorsal gonostylus branch apically emarginate (Fig. 8 c) and the gonocoxal lobe with apical setae parallel, not splaying (Fig. 8 a); from E. afrorepanda in having the gonocoxal lobe mostly bare, with parallel ventral margins (Fig. 8 a); from other species in the E. parva group in having the internal gonostylus branch with 3 setae close to the apex (Fig. 8 c).

Etymology

Named in honour of Dr. Ashley Kirk-Spriggs, the collector of the holotype, who also collected other invaluable material of several species described in this revision.

Distribution

Afrotropical, Burundi (Fig. 4 ).

Biology

Adult collected in afromontane forest (2237 m a.s.l.).

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).