Gerris (Gerris) lacustris Linnaeus, 1758

Berchi, Gavril Marius, Cianferoni, Fabio, Csabai, Zoltán, Damgaard, Jakob, Olosutean, Horea, Ilie, Daniela Minodora, Boda, Pál & Kment, Petr, 2018, Water striders (Heteroptera: Gerromorpha: Gerridae) of Romania with an update on the distribution of Gerris gibbifer and G. maculatus in southeastern Europe, Zootaxa 4433 (3), pp. 491-519 : 502-506

Gerris (Gerris) lacustris Linnaeus, 1758

Material examined. ROMANIA: Alba County: Mihalț [stream], 46°10ʹ02ʺN 23°43ʹ01ʺE, 223 m a.s.l., 09.vii.2014, leg. & det. P. Boda , 1 ♀ (br) ( PBDH); Pănade [stream], 46°13ʹ26ʺN 23°57ʹ55ʺE, 248 m a.s.l., 09.vii.2014, leg. & det. P. Boda , 1 ♂ (ma) (PBDH). Arad County: Chier [stream], 46°20ʹ57ʺN 21°49ʹ20ʺE, 116 m a.s.l., 22.vi.2013, 1 ♀ (ma); Târnova [stream], 46°19ʹ06ʺN 21°48ʹ12ʺE, 130 m a.s.l., 22.vi.2013, 1 ♂ (ma) . Bacău County: Comănești [pond], 46°24ʹ32ʺN 26°25ʹ32ʺE, 428 m a.s.l., 13.viii.2013, leg. A. Pintilioaie, det. G.M. Berchi , 1 ♂ (ma) 1 ♀ (ma); Târgu Trotuș [stream], 46°16ʹ00ʺN 26°42ʹ45ʺE, 226 m a.s.l., 02.viii.2011, 1 ♂ (br) 2 ♂♂ (ma); Oituz [pond], 46°17ʹ18ʺN 26°35ʹ23ʺE, 298 m a.s.l., 02.viii.2011, 2 ♂♂ (ma) 2 ♀♀ (ma) . Bihor County: Bolcaș [stream], 47°21ʹ24ʺN 22°13ʹ50ʺE, 125 m a.s.l., 05.v.2012, 1 ♂ (ma) 1 ♀ (ma); Colești [stream], 46°28ʹ38ʺN 22°25ʹ58ʺE, 400 m a.s.l., 22.vi.2013, 2 ♀♀ (br); Criștioru de Jos [stream], 46°26ʹ15ʺN 22°31ʹ02ʺE, 387 m a.s.l., 22.vi.2013, 1 ♀ (ma); Padiș [pond], 46°35ʹ59ʺN 22°42ʹ09ʺE, 1243 m a.s.l., 23.vi.2013, 1 ♂ (ma) 3 ♀♀ (ma); Roșiori [stream], 47°14ʹ10ʺN 21°56ʹ44ʺE, 111 m a.s.l., 05.v.2012, 1 ♀ (ma); Ștei (= Dr. Petru Groza) [swamp near river at railway station], ± 300 m a.s.l., 25.vii.1998, leg. P. Šmarda, det. P. Kment , 2 ♀♀ (ma) ( NMPC). Bistrița- Năsăud County: Beclean [channel], 47°10ʹ27ʺN 24°13ʹ17ʺE, 252 m a.s.l., 11.viii.2013, leg. & det. D.M. Ilie , 2 ♂♂ (ma) 1 ♀ (ma) (DISR); idem [lake], 47°10ʹ32ʺN 24°13ʹ05ʺE, 252 m a.s.l., 09.viii.2013, leg. & det. D.M. Ilie, 2 ♂♂ (ma) 1 ♀ (ma) (DISR); idem [lake], 47°10ʹ30ʺN 24°13ʹ11ʺE, 252 m a.s.l., 11.viii.2013, leg. & det. D.M. Ilie, 6 ♂♂ (ma) 8 ♀♀ (ma) ( DISR); Blăjenii de Sus [intermittent stream], 47°10ʹ03ʺN 24°22ʹ47ʺE, 281 m a.s.l., 09.viii.2011, 17 ♂♂ (ma) 13 ♀♀ (ma); Budacu de Sus [pond], 47°04ʹ11ʺN 24°42ʹ59ʺE, 685 m a.s.l., 29.vii.2011, 1 ♂ (ma); Ciceu Giurgești [pond], 47°13ʹ52ʺN 24°00ʹ58ʺE, 335 m a.s.l., 09.viii.2011, 6 ♂♂ (ma) 4 ♀♀ (br) 2 ♀♀ (ma); Ghemeș [stream], 46°47ʹ10ʺN 24°25ʹ54ʺE, 345 m a.s.l., 13.vii.2014, leg. & det. P. Boda , 4 ♂♂ (ma) 2 ♀♀ (br) 4 ♀♀ (ma) (PBDH); Salva [pond], 47°17ʹ40ʺN 24°19ʹ37ʺE, 322 m a.s.l., 09.viii.2011, 1 ♂ (ma). Brașov County: Bunești [stream], 46°06ʹ27ʺN 25°06ʹ01ʺE, 513 m a.s.l., 05.viii.2011, 4 ♂♂ (ma) 1 ♀ (br) 2 ♀♀ (ma); Dejani, 45°42ʹ41ʺN 24°55ʹ45ʺE, 597 m a.s.l., 16.viii.2010, 3 ♂♂ (ma) 3 ♀♀ (ma); Rupea [pond], 46°02ʹ18ʺN 25°11ʹ15ʺE, 516 m a.s.l., 09.viii.2011, 3 ♂♂ (ma) 1 ♀ (br) 3 ♀♀ (ma); Sebeș, 45°43ʹ36ʺN 25°01ʹ52ʺE, 566 m a.s.l., 16.viii.2010, 2 ♀♀ (ma); Vlădeni [intermittent stream], 45°46ʹ22ʺN 25°20ʹ19ʺE, 550 m a.s.l., 06.viii.2012, 1 ♀ (ma) . Buzău County: Buda Crăciunești [intermittent stream], 45°11ʹ33ʺN 26°23ʹ30ʺE, 262 m a.s.l., 30.vii.2012, 2 ♂♂ (br); Haleș [intermittent stream], 45°11ʹ54ʺN 26°33ʹ34ʺE, 207 m a.s.l., 31.vii.2012, 3 ♂♂ (ma) 1 ♀ (br) 4 ♀♀ (ma); Policiori [stream], 45°20ʹ40ʺN 26°39ʹ53ʺE, 235 m a.s.l., 04.viii.2011, 1 ♀ (ma) . Caraș-Severin County: Anina [stream], 45°03ʹ39ʺN 21°51ʹ06ʺE, 603 m a.s.l., 01.viii.2013, 1 ♂ (ma) 1 ♀ (br) 1 ♀ (ma); Berzasca [stream], 44°39ʹ36ʺN 21°58ʹ33ʺE, 101 m a.s.l., 26.viii.2010, 3 ♂♂ (ma) 4 ♀♀ (ma); Bocșa [pond], 45°21ʹ24ʺN 21°43ʹ28ʺE, 190 m a.s.l., 23.iv.2017, 2 ♀♀ (ma); Carașova [pond], 45°12ʹ46ʺN 21°52ʹ01ʺE, 298 m a.s.l., 08.iv.2017, 1 ♂ (ma) 2 ♀♀ (ma); Crușovăț [pond], 44°59ʹ47ʺN 22°19ʹ51ʺE, 271 m a.s.l., 21.vii.2012, 1 ♂ (ma); Cuptoare [pond], 45°14ʹ35ʺN 21°57ʹ55ʺE, 622 m a.s.l., 21.v.2017, leg. M.D. Leu, det. G.M. Berchi , 2 ♂♂ (ma) 1 ♀ (br) ( GBCR); Dognecea [stream], 45°17ʹ48ʺN 21°46ʹ00ʺE, 319 m a.s.l., 04.viii.2013, 1 ♀ (ma); Eftimie Murgu [stream], 44°49ʹ57ʺN 22°08ʹ23ʺE, 595 m a.s.l., 07.viii.2013, 1 ♂ (br) 1 ♂ (ma) 1 ♀ (br) 2 ♀♀ (ma); Ezeriș [swamp], 45°26ʹ05ʺN 21°52ʹ07ʺE, 210 m a.s.l., 22.iv.2017, 1 ♂ (ma) 1 ♀ (br) 1 ♀ (ma); Măru [pond], 44°27ʹ25ʺN 22°26ʹ34ʺE, 428 m a.s.l., 25.x.2012, 1 ♂ (br) 2 ♂♂ (ma) 2 ♀♀ (br) 4 ♀♀ (ma); Rusca [pond], 45°08ʹ23ʺN 22°29ʹ37ʺE, 839 m a.s.l., 27.vi.2017, 1 ♂ (br) 2 ♂♂ (ma) 1 ♀ (ma); Soceni [stream], 45°22ʹ34ʺN 21°56ʹ11ʺE, 240 m a.s.l., 12.v.2012, 4 ♂♂ (ma) 2 ♀♀ (ma); Zorlențu Mare [stream], 45°26ʹ08ʺN 21°58ʹ07ʺE, 195 m a.s.l., 22.iv.2017, 2 ♂♂ (br) 1 ♂ (ma) 1 ♀ (br) 2 ♀♀ (ma) . Cluj County: Caps [stream], 46°36ʹ58ʺN 23°17ʹ56ʺE, 827 m a.s.l., 08.vii.2014, leg. & det. P. Boda , 5 ♂♂ (ma) 3 ♀♀ (ma) ( PBDH); Fundătura [stream], 46°57ʹ48ʺN 23°44ʹ55ʺE, 294 m a.s.l., 09.viii.2011, 3 ♂♂ (ma) 1 ♀ (br) 2 ♀♀ (ma); Iara [stream], 46°33ʹ46ʺN 23°29ʹ39ʺE, 4 75 m a.s.l., 08.vii.2014, leg. & det. P. Boda , 3 ♂♂ (ma) 4 ♀♀ (ma) ( PBDH); Petreștii de Jos [stream], 46°34ʹ08ʺN 23°40ʹ13ʺE, 485 m a.s.l., 08.vii.2014, leg. & det. P. Boda , 1 ♂ (ma) ( PBDH); Șutu [stream], 46°37ʹ40ʺN 23°33ʹ10ʺE, 521 m a.s.l., 08.vii.2014, leg. & det. P. Boda , 2 ♂♂ (ma) 1 ♀ (br) 1 ♀ (ma) (PBDH). Covasna County: Întorsura Buzăului [stream], 45°40ʹ38ʺN 26°03ʹ40ʺE, 695 m a.s.l., 05.viii.2011, 6 ♂♂ (ma) 6 ♀♀ (ma) . Dâmbovița County: Corbii Mari [stream], 44°31ʹ43ʺN 25°29ʹ30ʺE, 123 m a.s.l., 07.viii.2015, 1 ♀ (ma); Gura Foii [stream], 44°44ʹ48ʺN 25°17ʹ12ʺE, 191 m a.s.l., 30.vii.2012, 1 ♂ (br) 1 ♀ (br) 1 ♀ (ma); Mislea [stream], 44°50ʹ49ʺN 25°19ʹ28ʺE, 248 m a.s.l., 30.vii.2012, 1 ♂ (br) 1 ♂ (ma) 2 ♀♀ (br) . Dolj County: Plopșor [stream], 44°15ʹ28ʺN 23°27ʹ12ʺE, 119 m a.s.l., 27.vii.2012, 1 ♀ (br) . Galați County: Corni [pond], 45°51ʹ48ʺN 27°48ʹ00ʺE, 112 m a.s.l., 01.viii.2012, 1 ♂ (ma) . Harghita County: Atid [stream], 46°27ʹ41ʺN 25°04ʹ42ʺE, 471 m a.s.l., 11.vii.2014, leg. & det. P. Boda , 2 ♂♂ (ma) (PBDH); idem [pond], 46°27ʹ41ʺN 25°04ʹ42ʺE, 471 m a.s.l., 11.vii.2014, leg. & det. P. Boda, 1 ♂ (br) 3 ♀♀ (ma) ( PBDH); Corund [stream], 46°29ʹ59ʺN 25°09ʹ55ʺE, 522 m a.s.l., 11.vii.2014, leg. & det. P. Boda , 2 ♀♀ (ma) ( PBDH); Filpea [stream], 46°51ʹ58ʺN 25°24ʹ01ʺE, 754 m a.s.l., 28.vii.2011, 1 ♀ (ma); Gheorgheni [swamp], 46°45ʹ02ʺN 25°41ʹ13ʺE, 919 m a.s.l., 05.v.2017, 1 ♂ (ma) 1 ♀ (ma); Izvoru Mureșului [stream], 46°37ʹ25ʺN 25°44ʹ23ʺE, 870 m a.s.l., 27.vii.2011, 2 ♂♂ (ma); Miercurea Ciuc [stream], 46°23ʹ13ʺN 25°43ʹ18ʺE, 751 m a.s.l., 03.viii.2014, 1 ♀ (ma); Sâncrai [stream], 46°22ʹ15ʺN 25°19ʹ41ʺE, 596 m a.s.l., 11.vii.2014, leg. & det. P. Boda , 1 ♂ (ma) ( PBDH). Hunedoara County: Anineș [channel], 45°38ʹ49ʺN 23°16ʹ07ʺE, 780 m a.s.l., 20.vii.2012, leg. & det. H. Olosutean , 1 ♂ (ma) ( HOSR); Bulzeștii de Jos [stream], 46°16ʹN 22°44ʹE, 375 m a.s.l., 14.vi.2013, leg. F. Terzani & A. Bandinelli, det. F. Cianferoni , 1 ♂ (ma) ( MZUF); Costești [pond], 45°40ʹ50ʺN 23°09ʹ40ʺE, 376 m a.s.l., 21.vii.2012, leg. & det. H. Olosutean , 1 ♂ (ma) ( HOSR); Rișca [temporary puddle], 46°12ʹN 22°43ʹE, 270 m a.s.l., 19.vi.2013, leg. F. Terzani, A. Bandinelli & S. Cortellessa, det. F. Cianferoni , 1 ♀ (ma) (MZUF) 1 ♂ (ma) 1 ♀ (ma) (CFC); Valea Rea [lake], 45°39ʹ30ʺN 23°11ʹ32ʺE, 515 m a.s.l., 18.vii.2012, leg. & det. H. Olosutean, 2 ♂♂ (ma) 2 ♀♀ (ma) ( HOSR); Vaidei [stream], 45°53ʹ15ʺN 23°17ʹ46ʺE, 231 m a.s.l., 22.iv.2014, leg. I.A. Rădac, det. G.M. Berchi , 1 ♂ (br) 2 ♀♀ (ma) (GBCR). Iași County: Șcheia [stream], 47°06ʹ29ʺN 26°53ʹ12ʺE, 203 m a.s.l., 02.viii.2012, 1 ♀ (br) 1 ♀ (ma); Scobinți [stream], 47°24ʹ29ʺN 26°55ʹ40ʺE, 128 m a.s.l., 03.viii.2012, 1 ♀ (br) . Maramureș County: Baia Borșa [pond], 47°41ʹ10ʺN 24°47ʹ00ʺE, 858 m a.s.l., 03.v.2017, 1 ♂ (ma) 2 ♀♀ (ma); Cavnic [stream], 47°37ʹ35ʺN 23°48ʹ25ʺE, 506 m a.s.l., 01.v.2017, 1 ♂ (ma) 1 ♀ (ma); Câmpulung la Tisa [stream], 47°58ʹ46ʺN 23°44ʹ31ʺE, 250 m a.s.l., 26.vi.2013, 1 ♂ (ma); Gutâi Mountains [pond], 47°41ʹ52ʺN 23°48ʹ48ʺE, 1063 m a.s.l., 01.v.2017, 1 ♀ (ma); idem [stream], 47°41ʹ49ʺN 23°47ʹ55ʺE, 1019 m a.s.l., 01.v.2017, 1 ♂ (ma) 1 ♀ (ma); Hoteni [pond], 47°45ʹ37ʺN 23°54ʹ12ʺE, 527 m a.s.l., 30.iv.2017, 2 ♀♀ (ma); Moisei [pond], 47°37ʹ59ʺN 24°32ʹ45ʺE, 717 m a.s.l., 03.v.2017, 1 ♀ (ma); Petrova [stream], 47°49ʹ54ʺN 24°10ʹ43ʺE, 398 m a.s.l., 02.v.2017, 2 ♂♂ (ma) 1 ♀ (br); Poienile de sub Munte [pond], 47°49ʹ10ʺN 24°30ʹ03ʺE, 629 m a.s.l., 02.v.2017, 1 ♂ (br) 3 ♂♂ (ma) 3 ♀♀ (ma); Rona de Sus [pond], 47°52ʹ02ʺN 24°05ʹ29ʺE, 410 m a.s.l., 30.iv.2017, 1 ♂ (br) 7 ♂♂ (ma) 1 ♀ (br) 8 ♀♀ (ma); Șesuri [swamp], 47°35ʹ47ʺN 24°57ʹ04ʺE, 1070 m a.s.l., 04.v.2017, 1 ♂ (ma); Valea Chioarului [stream], 47°25ʹ02ʺN 23°29ʹ09ʺE, 273 m a.s.l., 24.v.2015, leg. D. Copilaș-Ciocianu, det. G.M. Berchi , 1 ♂ (ma) 1 ♀ (br) (GBCR). Mehedinți County: Ciovârnășani [stream], 44°44ʹ50ʺN 22°52ʹ37ʺE, 188 m a.s.l., 21.viii.2011, 1 ♀ (ma); Cireșu [intermittent stream], 44°49ʹ11ʺN 22°33ʹ27ʺE, 371 m a.s.l., 16.vii.2013, leg. D. Copilaș-Ciocianu, det. G.M. Berchi , 6 ♂♂ (ma) 3 ♀♀ (ma) ( GBCR); Pătulele [stream], 44°20ʹ59ʺN 22°46ʹ44ʺE, 71 m a.s.l., 26.vii.2012, 2 ♂♂ (ma) 1 ♀ (ma); Svinița [pond], 44°33ʹ05ʺN 22°02ʹ21ʺE, 121 m a.s.l., 19.viii.2012, 1 ♀ (ma); Valea Cernei [pond], 45°01ʹ05ʺN 22°33ʹ33ʺE, 408 m a.s.l., 12.viii.2011, 1 ♂ (ma) 1 ♀ (br) 2 ♀♀ (ma) . Mureș County: Bahnea [stream], 46°21ʹ35ʺN 24°30ʹ14ʺE, 315 m a.s.l., 07.viii.2011, 3 ♂♂ (br) 1 ♂ (ma) 1 ♀ (ma); Brâncovenești [stream], 46°51ʹ21ʺN 24°46ʹ05ʺE, 392 m a.s.l., 12.vii.2014, leg. & det. P. Boda , 1 ♀ (ma) ( PBDH); Criș [stream], 46°08ʹ49ʺN 24°41ʹ42ʺE, 417 m a.s.l., 06.viii.2011, 1 ♀ (ma); Lăpușna [stream], 46°46ʹ06ʺN 25°13ʹ10ʺE, 859 m a.s.l., 12.vii.2014, leg. & det. P. Boda , 1 ♂ (ma) 10 ♀♀ (ma) (PBDH); Lechința [stream], 46°28ʹ17ʺN 24°13ʹ14ʺE, 278 m a.s.l., 10.vii.2014, leg. & det. P. Boda, 7 ♂♂ (br) 7 ♂♂ (ma) 7 ♀♀ (br) 9 ♀♀ (ma) (PBDH); Leordeni [stream], 46°28ʹ17ʺN 24°29ʹ01ʺE, 300 m a.s.l., 10.vii.2014, leg. & det. P. Boda, 4 ♀♀ (br) ( PBDH); Miercurea Nirajului [stream], 46°32ʹ58ʺN 24°50ʹ45ʺE, 351 m a.s.l., 08.viii.2011, 5 ♂♂ (ma) 1 ♀ (ma); Mitrești [stream], 46°35ʹ40ʺN 24°48ʹ22ʺE, 383 m a.s.l., 08.viii.2011, 3 ♂♂ (ma) 2 ♀♀ (ma); Sântu [stream], 46°47ʹ29ʺN 24°38ʹ13ʺE, 375 m a.s.l., 29.iv.2017, 3 ♂♂ (br) 4 ♂♂ (ma) 4 ♀♀ (br) 4 ♀♀ (ma); Vădaș [stream], 46°27ʹ59ʺN 24°49ʹ53ʺE, 357 m a.s.l., 07.viii.2011, 7 ♂♂ (ma) 6 ♀♀ (ma) . Neamț County: Pluton [pond], 47°11ʹ14ʺN 26°01ʹ41ʺE, 740 m a.s.l., 01.viii.2011, 1 ♂ (br) 6 ♂♂ (ma) 8 ♀♀ (ma); Vânători Neamț [pond], 47°15ʹ07ʺN 26°14ʹ36ʺE, 469 m a.s.l., 01.viii.2011, 1 ♂ (ma) 1 ♀ (br); idem [stream], 47°14ʹ51ʺN 26°13ʹ40ʺE, 456 m a.s.l., 04.viii.2012, 3 ♂♂ (ma) 6 ♀♀ (ma) . Olt County: Dobrosloveni [stream], 44°10ʹ06ʺN 24°21ʹ31ʺE, 76 m a.s.l., 28.vii.2012, 1 ♂ (br); Mirila [pond], 44°21ʹ37ʺN 24°11ʹ04ʺE, 134 m a.s.l., 27.vii.2012, 3 ♀♀ (br) 1 ♀ (ma) . Prahova County: Străoști [stream], 45°01ʹ51ʺN 26°13ʹ31ʺE, 136 m a.s.l., 30.vii.2012, 1 ♂ (br) 3 ♂♂ (ma) 6 ♀♀ (br) 1 ♀ (ma) . Sălaj County: Almașu [stream], 46°57ʹ33ʺN 23°06ʹ41ʺE, 320 m a.s.l., 27.vi.2013, 2 ♂♂ (ma) 1 ♀ (br) 4 ♀♀ (ma); Ciumărna [stream], 47°07ʹ22ʺN 23°08ʹ49ʺE, 291 m a.s.l., 27.vi.2013, 3 ♂♂ (ma) 1 ♀ (br) 2 ♀♀ (ma); Plopiș [pond], 47°06ʹ57ʺN 22°37ʹ47ʺE, 320 m a.s.l., 24.vi.2013, 2 ♀♀ (ma) . Satu Mare County: Doba [stream], 47°45ʹ22ʺN 22°42ʹ05ʺE, 123 m a.s.l., 26.vi.2013, 1 ♀ (ma); Drăgușeni [stream], 47°54ʹ51ʺN 23°04ʹ48ʺE, 132 m a.s.l., 26.vi.2013, 1 ♂ (br) 2 ♀♀ (br); Supur [stream], 47°27ʹ54ʺN 22°47ʹ42ʺE, 145 m a.s.l., 24.vi.2013, 1 ♀ (ma); Tășnad [stream], 47°32ʹ22ʺN 22°33ʹ51ʺE, 119 m a.s.l., 26.vi.2013, 1 ♂ (br) 1 ♂ (ma) 2 ♀♀ (ma) . Sibiu County: Alma [pond], 46°13ʹ17ʺN 24°29ʹ25ʺE, 370 m a.s.l., 06.viii.2011, 2 ♂♂ (ma); Blăjel [stream], 46°11ʹ36ʺN 24°19ʹ21ʺE, 384 m a.s.l., 29.iv.2017, 2 ♂♂ (ma) 2 ♀♀ (ma); Brădeni [stream], 46°05ʹ21ʺN 24°50ʹ06ʺE, 480 m a.s.l., 06.viii.2011, 4 ♂♂ (ma) 15 ♀♀ (ma); Cârțișoara [spring], 45°40ʹ01ʺN 24°34ʹ39ʺE, 693 m a.s.l., 17.iv.2015, leg. D. Copilaș-Ciocianu, det. G.M. Berchi , 4 ♂♂ (ma) ( GBCR); Laslea [stream], 46°13ʹ09ʺN 24°40ʹ10ʺE, 332 m a.s.l., 10.vii.2014, leg. & det. P. Boda , 1 ♂ (br) 2 ♂♂ (ma) 4 ♀♀ (br) ( PBDH); Sărata [stream], 45°45ʹ03ʺN 24°30ʹ12ʺE, 431 m a.s.l., 02.viii.2014, 1 ♂ (ma) 2 ♀♀ (ma); Șeica Mică [stream], 46°02ʹ51ʺN 24°07ʹ05ʺE, 325 m a.s.l., 07.viii.2011, 2 ♂♂ (br) 7 ♂♂ (ma) 2 ♀♀ (br) 3 ♀♀ (ma); Șinca Nouă [stream], 45°42ʹ18ʺN 25°11ʹ57ʺE, 575 m a.s.l., 02.viii.2014, 2 ♂♂ (ma) 1 ♀ (ma) ; Sibiu [lake], 45°45ʹ45ʺN 24°07ʹ31ʺE, 445 m a.s.l., 10.x.2014, leg. & det. H. Olosutean , 2 ♂♂ (ma) 2 ♀♀ (ma) (HOSR); idem [pond], 45°47ʹ23ʺN 24°07ʹ42ʺE, 407 m a.s.l., 18.vii.2014, leg. & det. H. Olosutean, 1 ♀ (ma) (HOSR); idem [stream], 45°48ʹ46ʺN 24°08ʹ58ʺE, 409 m a.s.l., 13.x.2014, leg. & det. H. Olosutean, 1 ♂ (br) 2 ♂♂ (ma) 2 ♀♀ (br) (HOSR); idem [stream], 45°45ʹ42ʺN 24°07ʹ34ʺE, 475 m a.s.l., 10.x.2014, leg. & det. H. Olosutean, 1 ♂ (br) ( HOSR); Veștem [stream], 45°42ʹ25ʺN 24°14ʹ43ʺE, 382 m a.s.l., 06.viii.2012, 1 ♀ (ma) . Suceava County: Bogdănești [stream], 47°22ʹ36ʺN 26°16ʹ48ʺE, 355 m a.s.l., 02.viii.2011, 3 ♂♂ (ma) 5 ♀♀ (ma); Brodina de Jos [channel], 47°48ʹ56ʺN 25°23ʹ47ʺE, 674 m a.s.l., 05.v.2017, 3 ♂♂ (ma) 2 ♀♀ (ma); Chiril [pond], 47°24ʹ33ʺN 25°32ʹ23ʺE, 758 m a.s.l., 04.v.2017, 2 ♂♂ (ma); Dolhasca [pond], 47°25ʹ07ʺN 26°36ʹ25ʺE, 214 m a.s.l., 30.vii.2011, 2 ♂♂ (br) 7 ♂♂ (ma) 2 ♀♀ (br) 7 ♀♀ (ma); Dumbrăveni [stream], 47°20ʹ54ʺN 26°08ʹ10ʺE, 486 m a.s.l., 04.viii.2012, 1 ♂ (ma) 1 ♀ (ma); Gheorghițeni [stream], 47°21ʹ43ʺN 25°26ʹ52ʺE, 757 m a.s.l., 04.v.2017, 1 ♂ (ma); Păișeni [pond], 47°25ʹ23ʺN 26°05ʹ25ʺE, 444 m a.s.l., 03.viii.2012, 2 ♂♂ (ma); Păltinoasa [stream], 47°33ʹ27ʺN 25°57ʹ25ʺE, 465 m a.s.l., 14.viii.2013, leg. & det. D.M. Ilie , 1 ♀ (ma) ( DISR); Poiana Stampei [stream], 47°17ʹ44ʺN 25°07ʹ03ʺE, 873 m a.s.l., 12.viii.2013, leg. & det. D.M. Ilie , 1 ♀ (ma) ( DISR); Putna [pond near stream], 47°51ʹ52ʺN 25°37ʹ40ʺE, 570 m a.s.l., 31.vii.2011, 1 ♀ (ma); idem, 05.v.2017, 1 ♂ (br) 2 ♂♂ (ma) 5 ♀♀ (ma); Sucevița [pond near stream], 47°45ʹ50ʺN 25°39ʹ19ʺE, 686 m a.s.l., 04.v.2017, 2 ♂♂ (ma); Vatra Moldoviței [channel], 47°38ʹ50ʺN 25°34ʹ06ʺE, 606 m a.s.l., 04.v.2017, 2 ♂♂ (ma) 1 ♀ (ma); Vârfu Dealului [stream], 47°35ʹ05ʺN 25°57ʹ08ʺE, 509 m a.s.l., 05.v.2017, 1 ♂ (br) 1 ♀ (br) . Timiș County: Becicherecu Mic [stream], 45°48ʹ36ʺN 21°06ʹ54ʺE, 93 m a.s.l., 08.viii.2015, 2 ♂♂ (br); Gătaia [stream], 45°25ʹ58ʺN 21°26ʹ24ʺE, 111 m a.s.l., 23.iv.2017, 2 ♂♂ (ma) 3 ♀♀ (ma); Lugoj [pond], 45°40ʹ44ʺN 21°55ʹ56ʺE, 116 m a.s.l., 08.viii.2015, 1 ♂ (ma); Victor Vlad Delamarina [stream], 45°38ʹ16ʺN 21°54ʹ06ʺE, 134 m a.s.l., 22.iv.2017, 1 ♂ (br) 3 ♂♂ (ma) . Vâlcea County: Romanii de Jos [stream], 45°08ʹ58ʺN 24°00ʹ52ʺE, 465 m a.s.l., 28.vii.2012, 1 ♂ (ma) 3 ♀♀ (ma); Valea lui Stan [pond], 45°20ʹ47ʺN 24°12ʹ17ʺE, 337 m a.s.l., 08.viii.2015, 2 ♀♀ (ma) . Vaslui County: Puiești [stream], 46°25ʹ03ʺN 27°30ʹ31ʺE, 107 m a.s.l., 03.viii.2011, 1 ♂ (br) 2 ♀♀ (br).

Published records. Fuss (1853, 1862, as Hydrometra lacustris ), Horváth (1878, 1898a), Montandon (1885), Kertész (1890, 1901), Simonkai (1893), Szilády (1908), Jaczewski (1934), Motaș & Anghelescu (1944), Motaș et al. (1962), Sienkiewicz (1964), Fesci (1969), Benedek (1970), Bucșa (1970), Kis (1972, 1975, 1976), Schneider (1973), Kis & Davidescu (1994), Kecskés (1997, 1999), Ilie (2001, 2003, 2005, 2007, 2014), Ilie & Davideanu (2002), Davideanu et al. (2004), Olosutean & Ilie (2007, 2008b, 2010a, b, c, 2013a, b, c), Skolka (2008), Ilie & Olosutean (2009, 2012), Nicoară et al. (2009), Olosutean et al. (2009), Ilie & Ban-Calefariu (2010), Berchi et al. (2011).

Remarks. In Romania, this species was identified at 143 sites at an elevational range of 71–1243 m a.s.l. ( Fig. 1 ). It was found from April to October in streams, channels, lakes, swamps, ponds and springs. The brachypterous/ macropterous ratio was: 0.19: 0.81 (total 118/510).

In northern Europe, G. lacustris populations are usually univoltine, with a partial second generation. In southeastern Europe, the species is bi- and multivoltine ( Vepsäläinen 1974a, Vepsäläinen & Krajewski 1974).

Distribution. Widely distributed across the Palaearctic Region ( Andersen 1995, Damgaard et al. 2014). For the Romanian distribution, see Fig. 7 .

Figures

FIGURE 1. Boxplots representing the elevational distribution of Gerridae in Romania. Circles represent outliers and asterisks represent extreme values.

FIGURES 2–7. Distribution in Romania: (2) Limnoporus rufoscutellatus (Latreille, 1807); (3) Aquarius najas (De Geer, 1773); (4) Aquarius paludum paludum (Fabricius, 1794); (5) Gerris argentatus Schummel, 1832; (6) Gerris costae fieberi Stichel, 1938; (7) Gerris lacustris (Linnaeus, 1758). Blank dots represent published records, question marks represent dubious published records of A. najas and solid dots represent records from this study.