Gerris (Gerriselloides) asper Fieber, 1860

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 : 497

Gerris (Gerriselloides) asper Fieber, 1860

Material examined. ROMANIA: Alba County: Jidvei [stream], 46°12ʹ29ʺN 24°06ʹ11ʺE, 291 m a.s.l., 07.viii.2011, 1 ♂ (ma) 1 ♀ (ma) . Bihor County: Cherechiu [stream], 47°24ʹ05ʺN 22°06ʹ29ʺE, 103 m a.s.l., 05.v.2012, 1 ♂ (ma) 1 ♀ (ma); Roșiori [stream], 47°14ʹ10ʺN 21°56ʹ44ʺE, 111 m a.s.l., 05.v.2012, 1 ♀ (ma). Caraș- Severin County: Bocșa [pond], 45°21ʹ24ʺN 21°43ʹ28ʺE, 190 m a.s.l., 23.iv.2017, 1 ♀ (ma); Ezeriș [swamp], 45°26ʹ05ʺN 21°52ʹ07ʺE, 210 m a.s.l., 22.iv.2017, 2 ♀♀ (ap) 1 ♀ (ma) . Dolj County: Bistreț (“ Ostrovul Gîtanu ”), 24.vi.1981, leg. D. Dumitrescu, det. B. Kis, 1 ♀ (ap) ( MGAB) ; Plopșor [stream], 44°15ʹ28ʺN 23°27ʹ12ʺE, 119 m a.s.l., 27.vii.2012, 1 ♀ (ma). Satu Mare County: Tășnad [stream], 47°32ʹ22ʺN 22°33ʹ51ʺE, 119 m a.s.l., 26.vi.2013, 1 ♀ (ap) . Sibiu County: Blăjel [stream], 46°11ʹ36ʺN 24°19ʹ21ʺE, 384 m a.s.l., 29.iv.2017, 1 ♀ (ma) . Timiș County: Dumbrăvița [pond], 45°48ʹ22ʺN 21°15ʹ50ʺE, 96 m a.s.l., 19.xii.2014, leg. I.A. Rădac, det. G.M. Berchi, 1 ♀ (ap) ( GBCR) ; Ghiroda [stream], 45°45ʹ42ʺN 21°19ʹ51ʺE, 95 m a.s.l., 12.xii.2014, leg. I.A. Rădac, det. G.M. Berchi, 1 ♂ (ap) 1 ♀ (ap) (GBCR); Timișoara [stream], 45°45ʹ17ʺN 21°16ʹ36ʺE, 101 m a.s.l., 23.iv.2013, 1 ♀ (ap).

Published records. Schneider (1973), Davideanu et al. (2000), Ilie (2001, 2003, 2007), Ilie & Davideanu (2002), Davideanu et al. (2004), Ilie & Ban-Calefariu (2010).

Remarks. In Romania, it was identified at 12 sites at an elevational range of 95–384 m a.s.l. ( Fig. 1 ). It was found from April to December in streams, bogs and ponds. The apterous/macropterous ratio was: 0.4: 0.6 (total 6/ 9).

In the Alps, G. asper is considered univoltine ( Nieser 1981), whereas in Hungary it is bivoltine ( Vepsäläinen 1974a). Probably, it is overwintering both as long- and short-winged morphs.

Distribution. West Palaearctic: central and southern Europe, Ukraine, Caucasus, Anatolia, Israel, Syria, Iran, Afghanistan, Morocco, and doubtfully in Algeria ( Andersen 1995, Damgaard et al. 2014). For the Romanian distribution, see Fig. 10 .

Figures

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

FIGURE 10. Distribution of Gerris asper (Fieber, 1860) (black dots) and G. lateralis Schummel, 1832 (white squares) in Romania. Blank shapes represent published records, question marks represent dubious published records of G. lateralis and solid shapes represent records from this study.