Zhiganka Lukashevich 1995

• Main Author: Lukashevich, Elena D.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2019
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Diptera; Ptychopteridae; Zhiganka; Ozero; Zhigansk; Yakutia
• Online Access: https://zenodo.org/record/5936279; https://doi.org/10.5281/zenodo.5936279

Genus: Zhiganka Lukashevich, 1995 (Figures 1–4, 5A, 6 A–D) Type species. Zhiganka comitans Lukashevich, 1995: 170, fig. 1e,g. Diagnosis (emended). Adult. Medium-size gracile flies, 9–13 mm long (Fig. 1B, G). Head not appressed to thorax (Figs 2A, D, 3A). Antenna with 19 flagellomeres, each with distinct scattered (4?) macrosetae and short pubescence, apical flagellomere reduced to button-like structure (Figs 2A, C, 3B). Clypeus acutely triangular, labrum small, sclerotized, labella large. Maxillary palpus elongate, with apical and preapical segments subequal (Figs 1A, 2D, 3A). Antepronotum well developed, prescutal suture distinct, scutum with incomplete transverse suture, all pleural sclerites without setae, transepimeral suture present (Figs 2D, 3A, 4F). Wings rather broad, slightly shorter than abdomen, with macrotrichia confined to apex adjacent to costa; C ending at wing apex, Rs stem long, aligned with straight R 4+5 stem, fork R 4+5 longer than R 4+5 stem; crossvein r-m under Rs furcation; spurious vein between veins R and M long; M forks before r-m; M 1+2 unforked, straight, and extremely thin; CuA slightly sigmoidal beyond m-cu; anal lobe well developed (Figs 1B, G, 2B, G, 3C, 4 A–C, 5A, 6A–C). Legs uniformly dark, without banding, tibial spur formula 1:2:2, foreleg spur spine-like, unmodified (Fig. 1 C–F). Abdomen narrow in both sexes (Fig. 1B, G). Male: epandrium divided into epandrial lobes, surstyli distinct. Gonocoxite without secondary lobe. Gonostylus simple lobe-like, pubescent. Hypandrium divided into basal and terminal divisions (Figs 2E, F, 3 F–H, 4D, E). Female: cerci tablike, setose, lightly sclerotized (Fig. 1H). Spermathecae absent or unsclerotized. Species included. Besides the type species from Zhigansk (Batylykh Formation, Yakutia, Russia; Lower Cretaceous), Z. woolgari Lukashevich, Coram, Jarzembowski, 2001 from Clockhouse (Wealden Group, United Kingdom; Upper Hauterivian) and Z. longialata sp. nov. described below from Khasurty (Gusinoe Ozero Group, Transbaikalia, Russia; Lower ...