Exechia sambai 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 sambai Lindemann sp. n.

Materials

Type status: Holotype. Occurrence: catalogNumber: TSZD-JKJ-107177 ; recordedBy: J. Kjærandsen; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate microvial; Location: country: Kenya; stateProvince: Nyeri county; locality: Mt. Kenya , Northern Naro Moru , Base camp at Naro Moru River Lodge ; verbatimElevation: 3050 m; decimalLatitude: -0.17028; decimalLongitude: 37.215; Event : samplingProtocol: sweep net; eventDate: 2008-08-19; habitat: bamboo forest; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-107178 ; recordedBy: J. Kjærandsen; individualCount: 1; sex: female; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate microvial; Location: country: Kenya; stateProvince: Nyeri county; locality: Mt. Kenya , Northern Naro Moru , Base camp at Naro Moru River Lodge ; verbatimElevation: 3050 m; decimalLatitude: -0.17028; decimalLongitude: 37.215; Event : samplingProtocol: sweep net; eventDate: 2008-08-19; habitat: bamboo forest; Record Level: institutionCode: TMU Type status: Paratype. Occurrence: catalogNumber: TSZD-JKJ-107176 ; recordedBy: J. Kjærandsen; individualCount: 1; sex: male; lifeStage: adult; preparations: Pinned, with genitalia in glycerine in separate microvial; Location: country: Kenya; stateProvince: Nyeri county; locality: Mt. Kenya , Northern Naro Moru , Base camp at Naro Moru River Lodge ; verbatimElevation: 3050 m; decimalLatitude: -0.17028; decimalLongitude: 37.215; Event : samplingProtocol: sweep net; eventDate: 2008-08-19; habitat: bamboo forest; Record Level: institutionCode: TMU

Description

Male (n = 2): Body length 3.3-3.4 mm. Wing length 2.8-2.9 mm. Colouration (Dry specimen). Head and face brown; clypeus pale brown; labellum yellow; palpus yellow to whitish-yellow. Antenna with scape and pedicel yellow; flagellum pale brown to brown, basal half of first flagellomere pale. Thorax with scutum pale brown, anterior and lateral margin slightly paler; lateral sclerites and propleura pale brown; halteres whitish-yellow. Legs whitish-yellow. Abdomen brown. Terminalia yellow. Head. Frons and vertex covered with pale setae. Clypeus covered with 13-16 pale setae, evenly distributed. Antenna long, 2.0-2.25 times as long as length from vertex to ventral margin of clypeus; flagellomeres longer than broad, with sixth flagellomere 1.2-1.3 times as long as wide. Thorax. Scutum covered with short, pale setae. Legs. Fore leg with tibia 0.91-0.95 times as long as first tarsomere. Mid-tibia with 22-23 anterior, 3-5 posterodorsal, 5-7 posterior and 2-4 posteroventral bristles. Hind tibia with 6-8 anterodorsal, 4 posterodorsal and 3-5 posterior bristles. Wings. Vein r-m 2.75-3 times longer than stem of M-fork. Abdomen. Tergites covered with pale setae. Terminalia (Fig. 34 a, b, c). Each part of divided tergite IX apically with about 6 setae, most apical seta stout. Gonocoxites (Fig. 34 a, b) with setae on apicoventral margin elongate, reaching far beyond GL apex. GL apex with 2 setae (Fig. 34 a, b). Aedaegal guides acuminate (Fig. 34 a). Hypandrium covered with about 11 setae, with apical pair elongate, reaching far beyond GL apex (Fig. 34 a, b). Hypandrial lobe with each branch short, evenly tapered, apex acute (Fig. 34 a). Gonostylus (Fig. 34 c) with DB short and squared; about 2 times longer than broad; apico-internal corner acuminate, extended apico-interiorly; apico-exterior corner forming rounded lobe, extended apico-exteriorly; apical margin emarginate; dorsal side evenly covered with setae, except on apical third; VB apically acuminate, with 2 setae, most apical seta on apex. IB apically rounded; apically with 3 setae close to apex. MB apically curved interiorly with apex acute; apically with 2 small setae.

Female: Body length 3.5 mm. Wing length 3.2 mm. Colouration (Dry specimen). Head, face and clypeus brown; labellum and palpus yellow. Antenna with scape and pedicel yellow; flagellum pale brown, basal part of first flagellomere pale. Thorax with scutum, lateral sclerites and propleura pale brown; halteres whitish-yellow. Legs whitish-yellow. Abdomen brown, tergites I-IV with pale lateral areas. Terminalia yellow. Head. Frons and vertex covered with short pale setae. Clypeus covered with pale setae, evenly distributed. Antenna 2 times as long as length from vertex to ventral margin of clypeus. Thorax. Scutum covered with short pale setae. Legs. Fore leg with tibia 0.92 times as long as first tarsomere. Mid-tibia with 24 anterior, 4 posterodorsal, 8 posterior and 3 posteroventral bristles. Hind tibia with 8 anterodorsal, 5 posterodorsal and 4 posterior bristles. Wings. Vein r-m 2.9 times longer than stem of M-fork. Abdomen. Tergites covered with dark brown setae. Terminalia (Fig. 34 d, e). Cerci with length of apical segment about two-thirds of basal segment. Tergite VIII with apicolateral margin weakly curved. Sternite VII with apicoventral margin acuminate. Sternite VIII (Fig. 34 d) in ventral view square shaped, equally broad along most of length, except abruptly tapered apical part; two large bare areas extending into basal part of setae cover; hypogynal valves separated by wide cleft with depth about one-seventh of sternite VIII length; apical seta about 0.6 of sternite VIII length. Gonapophysis IX (Fig. 34 e) with basolateral part abruptly expanded forming distally projecting lobe; spermathecal eminence weakly trilobed.

Diagnosis

Distinguished from E. penicillata in having the dorsal gonostylus branch 2 times longer than broad and with the apico-external corner extended into a rounded lobe (Fig. 34 c); from E. ashleyi in having the dorsal gonostylus branch with apico-internal corner extended and acuminate (Fig. 34 c) and the gonocoxites with setae on apicoventral margin reaching far beyond the gonocoxal lobe apex (Fig. 34 a, b); from E. burundiensis in having the dorsal gonostylus branch apically emarginate (Fig. 34 c) and the gonocoxal lobes with apical setae parallel, not splaying (Fig. 34 a, b); from E. afroparva in having the gonocoxal lobes with parallel ventral margins (Fig. 34 a, b); from other species in the E. parva group in having the internal branch of the gonostylus with 3 setae close to the apex (Fig. 34 c).

Etymology

Named in honour of the contemporary artist and painter Chéri Samba, relating to the shape of the internal lobe of the gonostylus, resembling a paintbrush.

Distribution

Afrotropical, Kenya (Fig. 4 )

Biology

Adult collected in bamboo forest (3050 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).