Macrorrhyncha nocticolor Polevoi, 2023

Polevoi, A. V. & Potapova, N. K., 2023, New data on the fungus gnats (Diptera: Keroplatidae, Mycetophilidae) of Yakutia with description of three new species, Far Eastern Entomologist 478, pp. 1-22 : 12-14

Macrorrhyncha nocticolor Polevoi , sp. n.

https://zoobank.org/NomenclaturalActs/ 3205A079-F374-4555-A185-DE3988B2D4EE

Figs 8–14

TYPE MATERIAL. Holotype – ♂, Russia: Yakutia, River Uyandina, Dyargalakh , 11 km SSE of Uyandi , 69.217° N, 141.017° E, 175 m, 8.VIII 2017, A. Popov leg. [ ZISP, INS _DIP_0001008].

DIAGNOSTIC CHARACTERS. Medium-sized species with almost completely black body, brownish legs and transparent wings. Resembles several European species ( Macrorrhyncha guichardi Chandler, 1994 ; M. veleka Bechev, 1992 ; M. geranias ( Loew, 1870) ; M. atticae Kurina, 2004 ) by black body color and bare mediotergite, but distinguished by the structure of male terminalia, especially the wide triangular dorsal process of gonocoxites, bearing 5 setae medially. Generally black North American Macrorrhyncha coxalis ( Loew, 1870) has scutellum yellow laterally and darkened knob of halter, while in new species scutellum is completely black and halter is uniformly brown.

DNA BARCODE BIN REGISTRY. Uniquely assigned to BIN BOLD:AEO8712, with distance 7.22% to the nearest BIN BOLD:AEJ6886, containing unidentified Keroplatidae .

DESCRIPTION. Male. Head black. Face, clypeus and mouthparts black. Distance from ventral margin of eye to tip of labellum 1.8 times as long as eye height. Antenna black, fifth flagellomere 1.3 times as long as wide. Palpi black.

Thorax. Mesonotum black with yellow humeral callus. Thinly gray dusted but more or less shining in posterior view, with irregularly biserial ac, 2–4 serial ds and numerous setae along lateral margins. All setae are black. Pleurae black. Laterotergite and mediotergite bare. Scutellum black.

Wing. Length 3.83 mm. Wing hyaline, veins yellowish-brown. C extending approximately to the middle between tips of R5 and M1. Sc ending free opposite the base of Rs. Distance between tips of R1 and R4 about as long as R4. Radiomedial fusion 0.3 times as long as stem of M1-M2. All veins with macrotrichia, except bare Sc, Rs, R4, base of M1 and M2, stem of M1-M2, tb, mcu and basal part of Cu1b. Halter brown.

Legs brownish yellow. Fore tibia with 0–1 p and 1 pv setae; mid tibia with 6 ad, 0–1 d, 2–3 pd, 3 p, 6 pv, 1–3 av setae; hind tibia with 5 ad, 3 d, 5 pd, 5 p, 4 pv and 4 av setae. Tibial spurs blackish; fore, and mid tibia with one spur, hind tibia with two spurs of equal length. Ratio of tibia to basitarsus for fore and hind leg: 1.37; 1.68.

Abdomen black, with black hairs.

Terminalia black. Gonocoxites with median bridge about one fourth as high as the height of gonocoxite ( Figs 8 , 11 ); inner process short with a strong apical seta ( Fig. 11 ); dorsal process triangular, bearing five setae medially ( Figs 12, 13 ). Tergite 9 rounded, concave posteriorly ( Fig 10 , 12 ). Gonostylus with three strong setae on inner surface and ventral process projecting mesially ( Figs 12, 14 ). Aedeagal complex long, with laterally compressed membranous plate and three pairs of associated apodemes ( Figs 8–10 ).

TAXONOMIC REMARKS. Possibly closely related species Macrorrhyncha coxalis has been described by a single female ( Loew, 1870: 132). Johannsen (1910) mentions one male from Canada, but provides only brief description of male terminalia, which is not sufficient for adequate comparison with new species.

DISTRIBUTION. So far known only from the type locality in the North-East Yakutia .

HABITAT AND BIOLOGY. Collected in herb rich meadow on slope. Larval biology unknown.

ETYMOLOGY. The species epithet (from Latin nocticolor – night colored) refers to black body color.

Figures

Figs 8–10. Male terminalia of Macrorrhyncha nocticolor sp. n. 8 – ventral view; 9 – lateral view; 10 – dorsal view. Scale bar = 0.2 mm.

Figs 11–14. Male terminalia of Macrorrhyncha nocticolor sp. n. (enlarged). 11 – ventral view; 12 – dorsal view; 13 – lateral view; 14 – gonostylus, lateral view. Abbreviations: dp – dorsal process of gonocoxites; vpg – ventral process of gonostylus. Scale bar = 0.2 mm.