Thrypticus nigricauda Wood, 1913

Kejval, Zbyněk & Pollet, Marc, 2024, Long-legged flies (Diptera: Dolichopodidae) in the Czech Republic- 2. Corindia and Thrypticus, Zootaxa 5432 (3), pp. 411-424 : 420

Thrypticus nigricauda Wood, 1913

Material examined. Bohemia: Hradčany, 1.2 km SE (5354), Držník pond, 50°36′35″N 14°43′26″E, 280 m, Schpl , 16.vi.2005, J. Roháček lgt., 1 ♂ ( SMOC) . Volevčice (5548), Velká Volavka NM, 50°25′53″N 13°41′58″E, 275 m, small pond, Schpt , 11.viii.2023, 1 ♂ ( MCH) . Dobroměřice (5648), Dobroměřický rybník (pond), 50°23′24″N 13°47′33″E, 195 m, Schpt , 12.viii.2023, 6 ♂ ( MCH) . Kateřina (5840), Soos NNR, 50°08′53″N 12°24′24″E, 440 m, saline swamps, Schpt / Elch, 5.vii.2021, 5 ♂ ( MCH) ; same data, 9–11.vi.2022, 17 ♂ ( MCH) ; same data, 21– 24.vi.2023, 163 ♂ ( MCH, MAPC, NMPC, SMOC) ; Plzeň-Bolevec (6246), Nováček pond, 49°47′05″N 13°22′50″E, 345 m, Schpl , 4.vii.2023, 1 ♂ ( MCH) . Přestavlky, 1.5 km SW (6445), 49°35′26″N 13°13′19″E, 390 m, forest pond, Schpl , 15.viii.2023, 3 ♂ ( MCH) .

Distribution. Widespread in Europe (only known from Portugal in the Mediterranean region, Pollet et al. 2019) and Russia.

Status in CZ. The first CZ records of this species are presented herein.

Ecology. Most probably preferring Schoenoplectus plants, as all the above listed specimens were swept either directly from S. lacustris (Hradčany, Plzeň-Bolevec, Přestavlky) or from stands with abundant presence of this plant genus; widespread and in some places quite common in salt marshes of the Soos NNR, with S. tabernaemontani being the dominant species ( Figs 3, 4 ).

Remarks. Thrypticus nigricauda was originally described from England (Herefordshire). Drake et al. (2023) noted some variation in the shape of the surstyli among the British specimens (having either slightly pointed or rather more rounded tip with tiny irregular teeth), and also differences from the surstylus figure in the redescription by Negrobov & Stackelberg (1972, fig. 291). The CZ specimens best match figure 9A in Drake et al. (2023) in having (lateral view) slender surstyli with moderately sinuous ventral margin and asymmetric, bluntly pointed apex. The hypopygial characters are rather uniform among the Czech specimens.

Figures

FIGURES 1–4. Collecting sites in Bohemia (Czech Republic) for Thrypticus species. 1, 2, Plzeň-Bolevec, NW banks of Velký bolevecký rybník, at extremely low (June 2022) and artificially raised water level (July 2023), with abundant Eleocharis palustris, Juncus spp. and Phragmites australis; 3, 4, Kateřina, Soos NNR, salt marshes with extensive Schoenoplectus tabernaemontani stands. All photos by Z. Kejval.