Syntormon metathesis (Loew, 1850) (Sympycninae)

Pollet, Marc, Andrade, Rui, Gonçalves, Ana, Andrade, Pedro, Jacinto, Valter, Almeida, Jorge, Braekeleer, Anja De, Calster, Hans Van & Brosens, Dimitri, 2019, Dipterological surveys in Portugal unveil 200 species of long-legged flies, with over 170 new to the country (Diptera: Dolichopodidae), Zootaxa 4649 (1), pp. 1-69 : 54-55

127. Syntormon metathesis (Loew, 1850) (Sympycninae) — new to Portugal

( Fig. 6F )

Number of specimens recorded. 6.

Distribution. Europe, but less in the south. Portugal: two provinces in the north and centre.

Ecology. In Portugal, this species was only recorded from two macrohabitat categories, with most of the specimens collected at a site featuring a mosaic of cattle pastures, riparian corridors and brackish wetlands, with trees and bushes bordering the fields and the riparian corridor. In northwestern Europe, this species is mostly found in very humid biotopes, ranging from brackish marshlands and meadows to swamps ( Pollet 2000).

Rarity (%). 2.3 (very rare). Fairly rare (FL).

Activity period. February–March, August–September, November.

Figures

FIGURE 6. Selected Portuguese species. A. Sympycnus pulicarius (♂); B. Sympycnus simplicipes (♂); C. Syntormon aulicum (♀); D. Syntormon codinai (♂); E. Syntormon denticulatum (♂); F. Syntormon metathesis (♀); G. Syntormon mikii (♂); H. Syntormon pallipes (♂); I. S. pallipes (♀); J. Systenus pallipes (♀); K. Tachytrechus insignis (♂); L. Tachytrechus notatus (♂); M. Teuchophorus spinigerellus (♀); N. Thinophilus flavipalpis (♂); O. Thrypticus bellus (♂); photos by Rui Andrade, except for G by Valter Jacinto.