Docosia svanetica Kurina, 2020

Ševčík, Jan, Burdíková, Nikola, Kaspřák, David & Kurina, Olavi, 2020, Five new Palaearctic species of Docosia (Diptera: Mycetophilidae), with updated molecular phylogeny of the genus, European Journal of Taxonomy 717, pp. 3-26 : 17-21

Docosia svanetica Kurina sp. nov.

urn:lsid:zoobank.org:act:51A54E2C-274B-4DB9-880B-0FDF2020E34A

Figs 1 , 6 , 7E

Differential diagnosis

By the structure of the male terminalia, D. svanetica sp. nov. belongs to a group of Palaearctic species as defined for D. polyspina sp. nov. and resembles D. kerkini . Both species have a simple sickle- or crescent-shaped gonostylus with a row of medial spines and a posteroventral margin of gonocoxites with submedial humps, bearing a comb of short setae. The subsimilar combs of the setae at the posteroventral margins of the gonocoxites are represented in several Palaearctic species (e.g., D. dentata , D. lastovkai Chandler, 1994 , D. melita Chandler et al., 2006 ), which have an otherwise different structure of the gonostylus and aedeagal complex. Dcosia svanetica sp. nov. differs markedly from D. kerkini in the shape of the ninth tergite, which is subcircular, while it is apically very wide and broadly concave in D. kerkini . Moreover, D. svanetica sp. nov. has a gonostylus with a prominent apical and four smaller medial spines in spite of about 12 medial subequal spines in D. kerkini . The laterotergite is setose in D. svanetica , while it is bare in D. kerkini .

Etymology

The species name refers to the type locality in Svanetia, a historic province of Georgia, in the northwestern part of the country.

Type material

Holotype

GEORGIA • ♂; Samegrelo-Zemo Svaneti, near Ushguli, path to glacier; 42°56′37.4″ N, 43°3′14.2″ E; 2220 m a.s.l.; 15–17 Jun. 2019; X. Mengual leg.; Malaise trap; in ethyl alcohol; ZFMK-DIP-00067332 .

Paratypes

GEORGIA • 1 ♂; same collection data as for holotype; IZBE-0200402 • 2 ♂ ♂; same collection data as for holotype; ZFMK-DIP-00067331 , ZFMK-DIP-00067330 • 1 ♂; same collection data as for holotype; IUTG ZFMK-DIP-00067329 • 1 ♂; same collection data as for holotype; after DNA extraction; GenBank: MT293024 , MT293055 , MT293038 , MT293072 , MT293006 ; JSL-UOC-JSDO39 • 1 ♂; Samegrelo-Zemo Svaneti, S of Lakhushdi , meadow ; 42°59′55.8″ N, 42°39′00″ E; 1270 m a.s.l.; 13–14 Jun. 2019; X. Mengual leg.; Malaise trap; in alcohol; IZBE-0200403 • 1 ♂; Samegrelo-Zemo Svaneti, S of Lakhushdi , meadow ; 42°59′56.3″ N, 42°39′07″ E; 1270 m a.s.l.; 13–14 Jun. 2019; X. Mengual leg.; double Malaise trap; in alcohol; IZBE-0200404 • 1 ♂; Samtskhe-Javakheti, road from Abastumani to Saime, near river; 41°46′38.2″ N, 42°50′14″ E; 1366 m a.s.l.; 10–11 Jun. 2019; X. Mengual leg.; double Malaise trap; in alcohol with terminalia in glycerol; IZBE-0200405 .

Description

Male (n = 9)

MEASUREMENTS. Length of wing 3.0– 3.4 mm (holotype = 3.2 mm).

HEAD. Blackish brown with numerous pale setae. Three ocelli, the lateral ones almost touching compound eyes, separated from eye margins by less than half of their own diameter. Mouthparts light brownish. Palpus with two basal segments brownish and three apical segments yellow. Scape, pedicel and all flagellomeres dark brown. Flagellomeres cylindrical, flagellomeres 1 and 2 about 1.3 times as long as broad, other flagellomeres 2–2.5 times as long as broad.

THORAX.All parts of thorax dark brown to blackish, with light setae. Scutellum with numerous pale setae and several submarginal pale bristles about twice as long as scutellum.Antepronotum and proepisternum with pale bristles and short darker setae. Laterotergite with 6–8 light bristles on posterior half, other pleural parts bare. Haltere pale yellow.

LEGS. All coxae yellow, with basal fifth of fore- and midcoxae, and basal third of hind coxa darkened. Trochanters brownish. Femora mostly yellow, fore and mid femora dark along ventral margin in proximal half, hind femur apically darkened. All tibiae yellow. Fore tibia apicomedially with semicircular tibial organ (anteroapical depressed area), without strong setae, only densely covered with fine setulae. Tarsi seem darker because of dense setae.

WINGS. Hyaline, unmarked. Radial veins and r-m dark brown, other veins paler, m-stem and basal parts of M 1 and M 2 faint, almost not traceable. Sc, Rs, bm-m, m-stem and basal third of cu-stem asetose, other veins setose. Costa reaches to about one third of the distance between R 5 and M 1. Sc ends in R at level of beginning of m-stem. Posterior fork begins before anterior fork, approximately at level of basal third of r-m.

ABDOMEN. Dark brown to blackish, with second and third segments light brown.

TERMINALIA ( Figs 6 A–E, 7E). Dark brown except lighter gonostyli. Tergite 9 subcircular, about as long as broad, posterior margin slightly concave, anterior margin with wide V-shaped incision medially. Posteroventral margin of gonocoxites with extended flange, with submedial humps bearing combs of strong short setae. Gonostylus simple, sickle-shaped, tapering, with (1) apical blunt spine, (2) row of four blunt spines medially, about twice shorter than the apical one, and (3) about 15 setae laterally on apical half. Cercus with 11 combs of retinacula.

Female

Unknown.

Biology

Unknown.

Figures

Fig. 1. Docosia svanetica Kurina sp. nov., paratype (ZFMK-DIP-00067331), habitus.

Fig. 6. Docosia svanetica Kurina sp. nov., ♂, terminalia. A. Lateral view. B. Posterior view. C. Ventral view of gonostylus. D. Dorsal view of cerci. E. Dorsal view of tergite 9. F. Ventral view of aedeagal complex. G. Lateral view of aedeagal complex. Scale bars = 0.1 mm.

Fig. 7. Male terminalia, ventroposterior view. A. Docosia anatolica Ševčík sp. nov. B. D. japonica Kurina sp. nov. C. D. polyspina Kurina sp. nov. D. D. peloponnensis Ševčík sp. nov. E. D. svanetica Kurina sp. nov. Scale bars = 0.1 mm.