Gerris (Gerris) maculatus Tamanini, 1946

Material examined. ROMANIA: Bihor County: Budureasa [pond], 46°40ʹ53ʺN 22°29ʹ02ʺE, 345 m a.s.l., 23.vi.2013, 1 ♂ (ma) 1 ♀ (ma); 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). Caraș-Severin County: Berzászka (= Berzasca), 10.vii.1898, leg. Pável, det. P. Benedek as G. gibbifer, revid. G.M. Berchi, 1 ♀ (ma) (HNHM); Carașova [pond], 45°12ʹ46ʺN 21°52ʹ01ʺE , 298 m a.s.l., 08.iv.2017, 1 ♂ (ma) 2 ♀♀ (ma); Mehadia [stream], 45°54ʹ42ʺN 22°23ʹ18ʺE, 368 m a.s.l., 15.vii.2012, 2 ♂♂ (ma); Rusca [pond], 45°08ʹ23ʺN 22°29ʹ37ʺE, 839 m a.s.l., 27.vi.2017, 9 ♂♂ (ma) 4 ♀♀ (ma); Sichevița [stream], 44°42ʹ56ʺN 21°47ʹ54ʺE, 281 m a.s.l., 12.vii.2014, 1 ♀ (ma); idem, 09.v.1883, det. G. Horváth as G. gibbifera, revid. G.M. Berchi, 1 ♂ (ma) (HNHM); Țarcu Mountains [pond], 45°18ʹ01ʺN 22°30ʹ36ʺE, 1603 m a.s.l., 24.x.2012, 1 ♂ (ma) 1 ♀ (ma); idem [glacial lake], 45°21ʹ51ʺN 22°40ʹ01ʺE, 1941 m a.s.l., 25.x.2012, 3 ♂♂ (ma) 3 ♀♀ (ma); Zorlențu Mare [stream], 45°26ʹ08ʺN 21°58ʹ07ʺE, 195 m a.s.l., 22.iv.2017, 1 ♂ (ma) 1 ♀ (ma). Cluj County: Cluj-Napoca, 31.iii.1968, det. B. Kis as G. gibbifer, revid. G.M. Berchi , 3 ♂♂ (ma) (MBBC); idem, 12.v.1968, det. B. Kis as G. gibbifer, revid. G.M. Berchi, 1 ♂ (ma) (MCMR). Maramureș County: Rona de Sus [pond], 47°52ʹ02ʺN 24°05ʹ29ʺE, 410 m a.s.l., 30.iv.2017, 1 ♂ (ma). Mehedinți County: Dubova, 26.iv.1968, det. B. Kis as G. gibbifer, revid. G.M. Berchi , 1 ♂ (ma) 3 ♀♀ (ma) (MCMR); Eșelnița, 13.iv.1968, det. B. Kis as G. gibbifer, revid. G.M. Berchi, 1 ♂ (ma) 2 ♀♀ (ma) (MCMR); Jupalnic (=Orșova), 30.iii.1967, leg. St. Negru, det. B. Kis as G. gibbifer, revid. G.M. Berchi, 3 ♂♂ (ma) 5 ♀♀ (ma) (MGAB). Sibiu County: Sibiu (surroundings), 09.vii.1955, leg. E. Worell, det. E. Schneider, 1972 as G. gibbifer, revid. G.M. Berchi , 2 ♂♂ (ma) (BNSR). Timiș County: Klopódia (= Clopodia), 1892, det. G. Horváth as G. gibbifera, revid. G.M. Berchi , 2 ♂♂ (ma) 2 ♀♀ (ma) (HNHM); Giroda (=Ghiroda), det. G. Horváth as G. gibbifera, revid. G.M. Berchi, 2 ♂♂ (ma) (HNHM); Luncanii de Jos [stream], 45°43ʹ28ʺN 22°18ʹ07ʺE , 416 m a.s.l., 05.vii.2013, 1 ♂ (ma); Moravița [stream], 45°15ʹ05ʺN 21°15ʹ57ʺE, 79 m a.s.l., 12.v.2012, 1 ♀ (ma). Tulcea County: Smîrdan (= Smârdan), 15.viii.1972, det. B. Kis as G. gibbifer, revid. G.M. Berchi, 1 ♀ (ma) (MGAB).

Additional material examined. EUROPE: ALBANIA: Vlorë (= Valona), det. T. Jaczewski as G. gibbifer, revid. G.M. Berchi, 1 ♂ (ma) 1♀ (ma) (HNHM). BULGARIA: Bojana, 17.vii.1956, leg. L. Hoberlandt, 1 ♂ (ma) (NMPC); Svilengrad, 14-18.vi.1947, leg. Expedition of NMPC, 1 ♀ (ma) (NPMC); Petrič, 27.v.1958, leg. & det. M. Josifov as G. italicus, revid. G.M. Berchi, 6 ♂♂ (ma) 6 ♀♀ (ma) (HNHM). CROATIA: Hvar Island, Stari Grad env., Dračevice [silting-up pond], 43°11.20ʹN 16°37.51ʹE, 13 m a.s.l., 23.vi.2009, leg. & det. P. Kment, 6 ♂♂ (ma) 8 ♀♀ (ma) (NMPC) 1 ♂ (ma) 1 ♀ (ma) (GBCR); Novi (=Novi Vinodolski), 07.vii.1899, det. G. Horváth as G. gibbifera, revid. G.M. Berchi, 1 ♀ (ma) (HNHM); Orehovica, 31.iii.1885, det. G. Horváth as G. gibbifera, revid. G.M. Berchi, 1 ♀ (ma) (HNHM); idem, 20.vi.1885, det. G. Horváth as G. gibbifer v. flaviventris, revid. G.M. Berchi, 1 ♀ (ma) (HNHM); Fiume (=Rijeka), 1884, det. G. Horváth as G. gibbifera, revid. G.M. Berchi, 1 ♀ (ma) (HNHM); Senj, 10.iv.1889, det. G. Horváth as G. gibbifera, revid. G.M. Berchi, 1 ♂ (ma) (HNHM). GREECE: Corfu, det. T. Jaczweski as G. gibbifer, revid. G.M. Berchi, 1 ♂ (ma) (HNHM). HUNGARY: Békés County: Mezőhegyes, leg. D. Kuthy, det. P. Benedek as G. gibbifer, revid. G.M. Berchi, 1 ♀ (ma) (HNHM); Csongrád County: Battonya (Királyhegyesi-Száraz-ér), 46°15ʹ28ʺN 21°04ʹ44ʺE, 97 m a.s.l., 10.vi.2016, leg. P. Boda, Z. Csabai, A. Farkas & A. Móra, det. G.M. Berchi & F. Cianferoni, 1 ♂ (ma) (PBDH); Szeged, 1874, det. G. Horváth as G. gibbifera, revid. G.M. Berchi, 1 ♂ (ma) 1 ♀ (ma) (HNHM); idem, 10.v.1937, det. P. Boda, G.M. Berchi & F. Cianferoni, 1 ♀ (ma) (MFMH); Tiszasziget, 21.iv.1934, det. P. Boda, G.M. Berchi & F. Cianferoni, 1 ♀ (ma) (MFMH); idem, 10.v.1937, det. P. Boda, G.M. Berchi & F. Cianferoni, 1 ♂ (ma) (MFMH). MACEDONIA: Čučer, 20.vi.1932, det. N. Kormilev as G. gibbifer, revid. G.M. Berchi, 3 ♂♂ (ma) 1 ♀ (ma) (PMBS); Monastir Blato (Werner), det. T. Jaczewski as G. gibbifer, revid. G.M. Berchi, 1 ♂ (ma) 4 ♀♀ (ma) (HNHM); Skopje, v.1907, leg. J. Petrović, det. G.M. Berchi, 3 ♀♀ (ma) (PMBS); idem, vi.1907, leg. N. Avramović, det. G.M. Berchi, 1 ♀ (ma) (PMBS). MONTENEGRO: Virpazar, 08.vi.1967, leg. P. Lauterer, 5 ♂♂ (ma) 2 ♀♀ (ma) (MMBC); Ulcinj, 19.v.2014, leg. & det. V. Hanzlík, 4 ♀♀ (ma) (VHNC). SERBIA: Bavanište (Kovin), 21.iv.2007, leg. M. Obrodović, det. G.M. Berchi, 1 ♀ (ma) (PMBS); Belgrade (Trešnja Jezero), 03.vi.2003, leg. L. Protić, det. G.M. Berchi, 2 ♀♀ (ma) (PMBS); Beljanica Mountain, 16.vii.2004, leg. M. Vujanić, det. G.M. Berchi, 1 ♂ (ma) (PMBS); Despotovac (Manastir Manasija), 19.vi.1908, leg. D. Stojićević, det. G.M. Berchi, 1 ♀ (ma) (PMBS); Konatice, 07.vi.1992, leg. L. Protić, det. G.M. Berchi, 1 ♂ (ma) (PMBS); Mladenovac, 03.vi.1947, leg. Expedition of NMPC, 1 ♀ (ma) (NPMC); Vrčin (Grocka), 30.iii.2014, leg. A. Stojanović, det. G.M. Berchi, 1 ♂ (ma) 1 ♀ (ma) (PMBS). SLOVENIA: Görz (=Gorica), 27.vi.1884, det. G. Horváth as G. gibbifera, revid. G.M. Berchi, 2 ♀♀ (ma) (HNHM). TURKEY (European part): Edirne, 8.–13.vi.1947, leg. Expedition of NMPC, det. L. Hoberlandt as G. gibbifer, revid. P. Kment, 1 ♂ (ma) 3 ♀♀ (ma) (NMPC). NORTH AFRICA: ALGERIA: Laverdure, 30.iv.– 14.v.1927, leg. J. Mařan, det. L. Hoberlandt as G. gibbifer, revid. P. Kment, 2 ♂♂ (ma) 1 ♀ (ma) (NMPC). TUNISIA: Aïn Draham, det. as G. gibbifer, revid. G.M. Berchi, 1 ♀ (ma) (HNHM); Tabarka (=Tabarca), det. as G. gibbifer, revid. G.M. Berchi, 1 ♂ (ma) (HNHM). Without locality: 29.iv.1885, det. as G. gibbifer, revid. G.M. Berchi, 1 ♂ (ma) 1 ♀ (ma) (HNHM); label “615/68”, det. as G. gibbifer, revid. G.M. Berchi, 1 ♂ (ma) (HNHM).

Remarks. In Romania, this species was identified at 24 sites at an elevational range of 79–1941 m a.s.l. (Fig. 1). It was found from March to October in streams, lakes and ponds. All the specimens examined were macropterous.

Gerris maculatus belongs to “ lacustris group” along with G. gibbifer, the western Mediterranean G. brasili Poisson, 1941, G. lacustris and two more eastern Palaearctic species (see Andersen 1993, Damgaard et al. 2014). Except for G. lacustris, which is dimorphic and includes both macropterous and brachypterous adults, and G. gibbifer with macropterous and very rare submacropterous morph, all other taxa in this group are considered exclusively macropterous (Andersen 1993). This accords with our findings in regard to G. maculatus, for which only the macropterous morph is known. This species is probably bivoltine or multivoltine, but further research is needed to clarify its life history traits.

Distribution. West Palaearctic: from Spain, France and Italy to Balkan Peninsula and Ukraine; Morocco, Algeria, Tunisia, Anatolia, Georgia, Armenia, Azerbaijan, Iran, and Israel (Schumacher 1914; Josifov 1958, 1963, 1970; Zimmermann 1982; Andersen 1995; Putshkov & Putshkov 1996; Strpić 1997; Protić 1998; Gogala 2003; Damgaard 2008a; Fent et al. 2011; Kment & Beran 2011; Aukema et al. 2013; Damgaard et al. 2014; Csabai et al. 2017; Taybi et al. in prep.; this paper). New species for Hungary, Montenegro and Slovenia. First detailed localities for Romania and Serbia. For its distribution in southeastern Europe, see Fig. 11.