Tetraneuromyia discrepans sp. nov.

Figs 35, 39

This new Tetraneuromyia is represented in our study material by a single male, which we do not hesitate to describe here as it is both distinctive and well-prepared.

Diagnosis. The tegmen of T. discrepans has a single pair of dagger-shaped processes, whose bases are broadened to form short, subtriangular lobes (Fig. 39, ↓ 5). Other Tetraneuromyia with only one pair of tegminal processes are T. wilksae Jaschhof & Jaschhof, 2015 and T. lapponica sp. nov., a species described below, but there the processes are different in shape and orientation, and their bases are blunt-ended and elongated. Another distinction concerns the gonocoxae: gonocoxal processes are absent in T. discrepans, but are present in both T. wilksae and T. lapponica.

Other male characters. Body size 1.8 mm. Head. Eye bridge 0–1 ommatidium long dorsally. Scape and pedicel concolorous with flagellum. Neck of fourth flagellomere 1.4 times as long as node (Fig. 35). Circumfila occasionally with short, indistinct posterior extensions. Thorax. Anepisternum asetose. Wing 2.8 times longer than wide. M 1+2 absent. Genitalia (Fig. 39). Posterior edge of ninth tergite slightly concave. Gonocoxae sparsely setose ventrally; ventral emargination broadly U-shaped, sclerotized basally; apodemes slightly angled posteriorly. Gonostylus blunt-ended, apex bent slightly inwards, without any modification. Tegmen strongly constricted medially. Ejaculatory apodeme moderately thick, unmodified except for a funnel-shaped, membranous apex.

Etymology. The species name, discrepans, is a Latin adjective meaning differing, with reference to the genitalic structures that are less complex than in other Tetraneuromyia.

Type material. Holotype. Male, Sweden, Öland, Borgholm, Rönnerum-Abbantorp Nature Reserve, small bushy fen in broadleaf forest, 22 August–30 September 2015, Malaise trap, M. & C. Jaschhof (spm. no. CEC 1512 in NHRS).