New evidences of the presence of Aphelocheirus aestivalis in the Iberian Peninsula, its ecology and description of two northeastern Iberian populations

Abstract

The waterbug Aphelocheirus aestivalis is herein recorded for the first time in Northeastern Iberian Peninsula, constituting the first citation of the family Aphelocheiridae in the region. Yet, later on in 1989, the description of three new endemic Iberian species belonging to Aphelocheirus implied the assumption that A. aestivalis was absent. Here, we show strong evidences of the presence of this species by the collection of individuals in two isolated stream reaches located 36 km apart, in the two Mediterranean rivers Llobregat and Ter. The Iberian specimens studied showed slight differentiation from other European specimens in the structures of male internal genital. Photographs of the habitus of the male and female are provided. More than 25 years of study of these rivers show Aphelocheirus sp. is confined solely to a short stretch in both rivers. Our study thus suggests that the distribution of A. aestivalis in the Iberian Peninsula should be revised and further investigated, and warns of urgent measures to improve, or at least preserve, the habitat and the hydrological conditions rivers Llobregat and Ter to protect the species.