Liancalus virens (Scopoli, 1763) (Hydrophorinae)

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 : 41

72. Liancalus virens (Scopoli, 1763) (Hydrophorinae) — new to Portugal

( Fig. 4E )

Number of specimens recorded. 25.

Distribution. Europe; also North Africa. Portugal: six northern and central provinces.

Ecology. Recorded from five macrohabitat categories, with most records from forests and riverbanks, and none from the littoral zone and dune biotopes. All over Europe, this species is found near running water, very often on vertical surfaces, ranging from seepages (even fountains in cities) to the riverbanks at rapids, and along fast–flow-ing rivers (e.g., on bridge pillars) ( Pollet 2000). In Croatia, the species clearly preferred riverbeds to riverbanks and springs ( Pollet & Ivković 2018).

Rarity (%). 17.2 (common). Extremely rare (FL), however, recent citizen science efforts produced a surprising amount of additional data from Flanders ( Pollet & Maes 2019).

Activity period. April–July, September.

Figures

FIGURE 4. Selected Portuguese species. A. Hercostomus germanus (♂); B. Hercostomus pilifer (♂); C. Hydrophorus oceanus (♀); D. Hydrophorus praecox (♀); E. Liancalus virens (♀); F. Machaerium maritimae (copula); G. Medetera ambigua (♂); H. Medetera dendrobaena (♂); I. Medetera flavipes (♂); J. Medetera mixta (♀); K. Medetera muralis (♂); L. Medetera peloria (♂); M. Medetera petrophiloides (♀); N. Medetera truncorum (♂); O. Muscidideicus praetextatus (♂); all photos by Rui An- drade.