Tetragoneura pudogensis, Polevoi, Alexei & Jakovlev, Jevgeni, 2011

Polevoi, Alexei & Jakovlev, Jevgeni, 2011, A review of the European species of the genus Tetragoneura Winnertz (Diptera: Mycetophilidae), Zootaxa 3062, pp. 1-12 : 9-10

5. Tetragoneura pudogensis sp.n.

( Fig. 1 : D–F)

Holotype: 3, RUSSIA, KARELIA, Kp: Prirechnyi, 3 km SW (alt. 100 m), 24.6– 13.8.2009, ( ZISP, A.Polevoi leg.)

Paratypes: 3 3, same data ( ZISP, A.Polevoi leg.).

Other material examined. FINLAND: 1 3, Ab: Karjalohja, Karkali Strict Nature Reserve, 24.8.– 05.10.2004 ( METLA, J. Jakovlev leg.).

Etymology. Named after locality Pudozh (also administrative district and biogeographical province, where type material originates from) in the South–East of Republic Karelia, using Latin suffix -ensis designating the place of origin.

Diagnostic characters. This species is closely related to T.ambigua Grzegorzek and T. sasakawai Oliveira & Amorim. Reliably distinguished only by the structure of male terminalia.

Description. Male (n=4)

Head black, densely gray dusted (posterior part looks thinly dusted in some angles), with numerous long black setae on vertex. Lateral ocellus separated from eye margin by the distance of 1.1–1.5 times its own diameter. Palpus yellow. Clypeus black, clothed with short hairs. Antennae brown, pedicel and two basal flagellomeres yellow. Fifth flagellomere 1.7–2.3 times as long as wide. Scape and pedicel with long black setae apically. Eyes densely covered with minute hairs.

Thorax. Scutum and scutellum black with gray polinosity. Scutum with short biserial ac, biserial dc and some long black setae by lateral margin. Pleurae dark-brown, thinly grey dusted. Antepronotum and proepisternum haired and with black bristles, the rest of the pleurae bare.

Wing length 2.38–2.65 [mean value 2.56] mm. Wing hyaline, veins yellow, costa and radius brownish. C extending well beyond the middle of the distance between R5 and M1. Sc short, ending free. R4 absent. R1 1–1.3 times as long as ta. Stem of M-fork 1.2–1.4 times as long as ta. Base of CuA-fork lies under the middle of ta. Macrotichia well developed on all veins with exception of proximal part of M. Haltere yellow.

Legs yellow, hind femur darkened apically. Front tibia with small pv. Mid tibia with 1 a, 1 ad, 2 pd, 3–4 p and pv. Hind tibia with 6–8 ad, 12–13 pd. Ratio of tibia to first tarsomere for front, mid and hind legs: 1.37–1.45 [1.41]; 1.7–1.86 [1.77]; 1.84–2.05 [1.99]. Front and mid tibia with one spur, hind tibia with two spurs of subequal length. Mid tibia with well developed ovate sensory organ dorsally on basal third.

Abdomen dark-brown, tergites II and III with yellow spots at base. Terminalia ( Fig. 1 : D–F), brown. Gonocoxites with narrow median cleft almost reaching their base. Gonostylus rather long, strongly sclerotised, bearing sparse short hairs apically. Aedeagus long well protruding beyond apical margin of tergite 9, reminds jumping dolphin in lateral view. Tergite 9 with wide triangular distal excavation, cerci reduced.

Female. Unknown.

Biology. All specimens were obtained with Malaise trap in herb-rich mixed secondary forest.

Distribution. Only known from south–east part of Republic Karelia (north–west Russia) and south Finland.

Figures

FIGURE 1. Male terminalia. A. T. ambigua, dorsal view. B. T. ambigua, ventral view. C. T. ambigua, lateral view. D. T. pudogensis sp. n., dorsal view. E. T. pudogensis sp. n., ventral view. F. T. pudogensis sp. n., lateral view. Scale bars = 0.2 mm. Abbreviations: ae = aedeagus, gc = gonocoxite, gst = gonostylus, tg = tergite, sml = submedian lobe.