Hydrophorus oceanus (Macquart, 1838) (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 : 40-41

70. Hydrophorus oceanus (Macquart, 1838) (Hydrophorinae)

( Fig. 4C )

Number of specimens recorded. 13.

Distribution. Restricted to the northwestern part of Europe; also North Africa. Portugal: northernmost (Minho) and southernmost province (Algarve) (this study), and Baixo Alentejo ( Naglis & Barták 2015) (also Dyte unpubl. data).

Ecology. Recorded in low numbers from different macrohabitat categories, including littoral, dune, and riparian habitats near the coast. This halobiont species is entirely confined to the littoral zone, everywhere in northwestern Europe ( Pollet 2000).

Rarity (%). 3.4 (rare). Rare (FL).

Activity period. May, August–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.