Gerris (Gerris) odontogaster Zetterstedt, 1828

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 : 507-508

Gerris (Gerris) odontogaster Zetterstedt, 1828

Material examined. ROMANIA: Buzău County: Haleș [intermittent stream], 45°11ʹ54ʺN 26°33ʹ34ʺE, 207 m a.s.l., 31.vii.2012, 1 ♂ (ma); Movila Banului [stream], 44°58ʹ06ʺN 26°39ʹ47ʺE, 74 m a.s.l., 21.vii.2014, 1 ♀ (ma) . Caraș-Severin County: Baziaș [stream], 44°49ʹ55ʺN 21°22ʹ13ʺE, 63 m a.s.l., 27.viii.2010, 1 ♂ (ma); Carașova [pond], 45°12ʹ46ʺN 21°52ʹ01ʺE, 298 m a.s.l., 08.iv.2017, 1 ♀ (ma); Semenic Mountains [stream], 45°11ʹ08ʺN 22°04ʹ58ʺE, 1366 m a.s.l., 26.iv.2014, 1 ♀ (ma); Țarcu Mountains [pond], 45°18ʹ01ʺN 22°30ʹ36ʺE, 1603 m a.s.l., 24.x.2012, 1 ♂ (ma); idem [glacial lake], 45°21ʹ51ʺN 22°40ʹ01ʺE, 1941 m a.s.l., 25.x.2012, 1 ♀ (ma) . Giurgiu County: Pietrele [stream], 44°03ʹ14ʺN 26°07ʹ40ʺE, 21 m a.s.l., 20.vii.2014, 1 ♂ (mi); Puțu Greci [pond], 44°08ʹ07ʺN 26°20ʹ16ʺE, 54 m a.s.l., 20.vii.2014, 1 ♀ (ma) . Harghita County: Rugănești [stream], 46°18ʹ45ʺN 25°05ʹ20ʺE, 405 m a.s.l., 05.viii.2011, 1 ♂ (ma) . Maramureș County: Moisei [pond], 47°37ʹ59ʺN 24°32ʹ45ʺE, 717 m a.s.l., 03.v.2017, 1 ♀ (ma) . Mehedinți County: Orșova [stream], 44°44ʹ42ʺN 22°24ʹ02ʺE, 273 m a.s.l., 16.viii.2011, 1 ♀ (ma); Pătulele [stream], 44°20ʹ59ʺN 22°46ʹ44ʺE, 71 m a.s.l., 26.vii.2012, 1 ♀ (ma) . Neamț County: Vânători Neamț [pond], 47°15ʹ07ʺN 26°14ʹ36ʺE, 469 m a.s.l., 01.viii.2011, 2 ♀♀ (mi) 1 ♀ (ma) . Sălaj County: Plopiș [pond], 47°06ʹ57ʺN 22°37ʹ47ʺE, 320 m a.s.l., 24.vi.2013, 1 ♂ (ma) . Suceava County: Dolhasca [pond], 47°25ʹ51ʺN 26°37ʹ13ʺE, 217 m a.s.l., 30.vii.2011, 1 ♂ (ma) 1 ♀ (ma) . Timiș County: Moșnița Nouă [stream], 45°43ʹ45ʺN 21°17ʹ32ʺE, 94 m a.s.l., 03.vi.2012, 1 ♀ (ma); Surducu Mic [stream], 45°46ʹN 22°06ʹE, 150 m a.s.l., 16.vi.2013 , leg. F. Terzani & A. Bandinelli, det. F. Cianferoni, 1 ♀ (ma) (CFC); Victor Vlad Delamarina [stream], 45°38ʹ16ʺN 21°54ʹ06ʺE, 134 m a.s.l., 22.iv.2017, 1 ♂ (ma).

Published records. Horváth (1878, 1898a), Montandon (1885, 1907), Jaczewski (1934), Sienkiewicz (1960), Bucșa (1970), Schneider (1973), Kis (1975, 1976), Kis & Davidescu (1994), Kecskés (1997), Ilie (2001, 2003, 2007, 2014), Ilie & Davideanu (2002), Davideanu et al. (2004), Ilie & Vițchii (2007), Olosutean & Ilie (2007, 2008a, 2010c, 2013a), 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 19 sites at an elevational range of 21–1941 m a.s.l. ( Fig. 1 ). It was found from April to October in streams, lakes and ponds. The micropterous/macropterous ratio was: 0.14: 0.86 (total 3/19).

It is usually univoltine in northern areas and bivoltine over the main part of its range ( Vepsäläinen & Nieser 1977). In Hungary, a partial third generation has been documented ( Vepsäläinen 1974a). Gerris odontogaster is known to be dimorphic in summer and long-winged in winter ( Vepsäläinen 1974b).

Distribution. Palaearctic: Euro-Siberian (cf. Andersen 1995, Damgaard et al. 2014). For the Romanian distribution, see Fig. 8 .

Figures

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

FIGURES 8–9. Distribution in Romania: (8) Gerris odontogaster (Zetterstedt, 1828); (9) Gerris thoracicus Schummel, 1832. Blank dots represent published records while solid dots represent records from this study.