Rheocricotopus (s. str.) tshernovskii Makarchenko & Makarchenko, 2005 Rheocricotopus (Rheocricotopus) tshernovskii Makarchenko & Makarchenko, 2005: 134. Rheocricotopus (Rheocricotopus) tshernovskii – Ashe & O’Connor 2012: 573. Type material Holotype RUSSIA – Sakhalin Is. • ♂; Nogliksky District, basin of Chamgu River (eastern seacoats); 743 m ASL; 13 Jul. 2003; V. Teslenko and T. Tiunova leg.; FEBRAS. The type specimen of R. (s. str.) tshernovskii was not examined. Distribution To date, the species is known only from the type locality, the Russian Far East. Remarks The species was described based on a male and a mature pupa from Sakhalin Island, the Russian Far East by Makarchenko & Makarchenko (2005: 134). The male is remarkably similar to that of R. (s. str.) reduncus Saether & Schnell, 1988 in the indistinct humeral pit, the wing with a reduced anal lobe, and the hypopygium with caudally projecting finger-like superior volsellae, but is separable from it by the wing with a moderately long costal extension, 76–80 μm (E. Makarchenko pers. comm. 2023), the superior volsella with a shorter finger-like projection (28– 32 μm long), and the gonostylus curved and expanded at distal one third (Makarchenko & Makarchenko 2005: 133 fig. 22). In the latter, the costal extension is slight, 35–59 μm long, the superior volsella possesses a relatively long projection (59–67 μm long including the base), and the gonostylus is gently curved at the middle and gradually narrowed towards the apex (Saether & Schnell 1988: 66–67 fig. 1d). The pupa is also distinct from that of R. (s. str.) reduncus in the abdominal segment VII with three simple L-setae, the tergite II with 35–37 small spines along the posterior margin, and the anal lobe with 14–15 lateral taeniae. According to Saether & Schnell (1988: 67–68), the latter has three taeniate LS-setae on segment VII, 120–170 spines along the posterior margin of tergite II, and 16–20 lateral taeniae on the anal lobe. The female and the larva are unknown.

Published as part of Niitsuma, Hiromi & Tang, Hongqu, 2026, Taxonomic review of Rheocricotopus Brundin, 1956 (Diptera: Chironomidae: Orthocladiinae) from East Asia, with descriptions of twelve new species, pp. 1-114 in European Journal of Taxonomy 1037 on pages 101-102, DOI: 10.5852/ejt.2026.1037.3157, http://zenodo.org/record/18507203