Trichosia (Trichosia) montaclaria Sutou & Menzel, 2025, sp. nov.
Creators: name: Sutou, Mitsuaki
name: Menzel, Frank
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Sciaridae
Trichosia
Trichosia montaclaria

description: Trichosia (Trichosia) montaclaria sp. nov.
Fig. 10 A ‒ D
Type material.
Holotype. JAPAN • ♂; Honshu, Yamanashi Pref., Koshu, Hikawa-rindou; 35°42'35"N, 138°49'42"E; alt. 1350 m; 26 June 2007; H. Kawai leg., sweep-net; NSMT.
Description.
Male. Head: Eye bridge 4‒5 facets wide. Prefrons with setae and clypeus bare. Scape brown with 3 setae, pedicel brown with about 8 setae; flagellomeres brown; 4 th flagellomere 3.5 times as long as wide, neck portion about 1 / 13 of its whole length (Fig. 10 A), hairs yellowish brown and slightly shorter than width of flagellomere. Palpus brown, 3 - segmented with length ratio 1.5: 1.0: 2.3, 1 st segment with 7 setae and with indistinct sensory area bearing minute sensilla, 2 nd segment with 9 setae, 3 rd segment slender with 8 setae (Fig. 10 B). Thorax: Color predominantly dark brown; setae on mesonotum and scutellum consist of longer and shorter ones, scutellum with 5 long setae; posterior pronotum with setae. Legs predominantly brown; tibiae and basitarsi with differentiated spine-like short setae in ground setosity; fore tibial spur about 1.3 times as long as width of tibial apex. Wing with brownish anterior veins and light brownish posterior veins; wing membrane without macrotrichia but a macrotrichium is seen between M 1 and M 2 of left wing; R 5 and M 1 with both dorsal and ventral macrotrichia, bM with 3 dorsal macrotrichia, r-m with 7 dorsal macrotrichia, M 2, CuA 1, and CuA 2 with dorsal macrotrichia, stem of M with 14‒15 dorsal macrotrichia; length of R 1 = 1.2 R, c = 0.7w, r-m = 1.0 bM, stem of CuA very short, almost absent; R 1 ending slightly beyond level of branching point of M 1 and M 2; wing length 4.0 mm. Halter brown, knob and distal 1 / 3 of stalk with setae. Abdomen: Tergites and sternites dark brown with dense dark brownish setae. Gonocoxite wider than long with U-shaped cleft in base (Fig. 10 C); gonostylus pyriform, left gonostylus with 6 spines and right gonostylus with 7 spines inside, 2 spines directed downward compared to the other ones (Fig. 10 D); tegmen nearly triangular but with arcuate base, and with rounded membranous appendage on upper portion (Fig. 10 C); aedeagus located beneath tegmen (Fig. 10 C). Body size: 3.9 mm.
Female. Unknown.
Remarks.
This new species resembles Palaearctic T. edwardsi and Nearctic T. cylindrica, but is distinguished from them by the shorter and more closely arranged spines of the gonostylus (Fig. 10 D). The clearly bordered U-shaped cleft of the base of the gonocoxite is also characteristic for this species (Fig. 10 C). Only one male of this species was collected at a high altitude locality (1350 m). The name of this new species is derived from the montane habitat where it was collected and its clear (bare) wing membrane contrasting with the dark brownish body.
description: Published as part of Sutou, Mitsuaki & Menzel, Frank, 2025, The genera Mouffetina Frey and Trichosia Winnertz (Diptera, Sciaridae) in Japan with a key for the Japanese species and an updated world checklist, pp. 167-182 in Contributions to Entomology 75 (1) on pages 167-182, DOI: 10.3897/contrib.entomol.75.e145605