Thrypticus atomus Frey, 1915

Kejval, Zbyněk & Pollet, Marc, 2024, Long-legged flies (Diptera: Dolichopodidae) in the Czech Republic- 2. Corindia and Thrypticus, Zootaxa 5432 (3), pp. 411-424 : 414

Thrypticus atomus Frey, 1915

( Figs 11, 14 )

Material examined. Bohemia: Horšovský Týn (6443) ( Fig. 11 ), 49°31′37″N 12°56′10.6″E, 370 m, swamp at Radbuza river, Carex buekii , 16.vi.2021, 1 ♂ 7 ♀ ( MCH) .

Moravia: Lanžhot (7367), Soutok, Košarské louky (meadows), ca 48°39′N 16°55′E, 150 m, 14.v.2001, J. Roháček lgt., 1 ♂ 1 ♀ ( SMOC) .

Distribution. Central and northwestern Europe, including Great Britain ( Drake et al. 2023), and Russia (rather widespread).

Status in CZ. Previously recorded from both Bohemia and Moravia: Třeboň ( Olejníček 1984), Vráž ( Naglis et al. 2016), Valtice and Nesyt pond ( Olejníček 1978, 1998). The Moravian records were based on two male specimens collected by J. Olejníček and bearing the following data: Valtice (“Valtice – leafy forest, June 26, 1971 ”), Nesyt pond (“Valtice, edges of the Nesyt pond, June 3, 1973 ”) ( Olejníček 1978). They proved absent in the Olejníček Collection in NMPC, but the occurrence of T. atomus in Moravia is confirmed by the new record given above.

Remarkably both specimens of T. smaragdinus from Valtice, listed in the latter paper (♂ ♀, see below), originated from the vicinity of Nesyt pond and bear the same date (3.vi.1973, J. Olejníček lgt.). Moreover, this species may resemble T. atomus by the unicolorous yellowish legs and for unknown reasons it is absent from the regional list by Olejníček (1998).

Ecology. In England, it was collected in a range of wetland habitats, such as fens, marshes and pond margins on river floodplains ( Drake et al. 2023). All specimens from the new CZ locality Horšovský Týn were swept directly from leaves of Carex buekii Vimmer , on a short marginal section (1–2 m) of an otherwise extensive and almost monodominant sedge bed, bordering a muddy periodic pool. Other potential host plants growing nearby were Juncus and Iris pseudacorus Linnaeus.

Figures

FIGURES 11–14. 11–13, Thrypticus habitus, lateral view. 11, T. atomus Frey (female, Horšovský Týn); 12, T. bolevensis sp. nov. (male, holotype); 13, T. cuneatus (Becker) (male, Plzeň-Bolevec); 14, T. atomus (Horšovský Týn, female ovipositor). All photos by Z. Kejval. Scale (1 mm)—Figs 11–13; (0.1 mm)—Fig. 14.