. Bonn zoological bulletin. Zoology. 208 Markus Lambertz et Figs 1. The caldera of the Cerro Azul volcano. View from its rim in north-eastern direction with Cone Lake in the center of the photo. Note the massive black lava field on the caldera's floor and the protective tuff cone harboring the lake. The white asterisk on the silhouette of the archipelago in the upper left comer indicates its geographic location. Photo: M. Lambertz. absence of dorsal hooks on their abdominal segments, an epiproct not shorter than the paraprocts and lateral spines of the 9th abdominal segment not extending
. Bonn zoological bulletin. Zoology. 208 Markus Lambertz et Figs 1. The caldera of the Cerro Azul volcano. View from its rim in north-eastern direction with Cone Lake in the center of the photo. Note the massive black lava field on the caldera's floor and the protective tuff cone harboring the lake. The white asterisk on the silhouette of the archipelago in the upper left comer indicates its geographic location. Photo: M. Lambertz. absence of dorsal hooks on their abdominal segments, an epiproct not shorter than the paraprocts and lateral spines of the 9th abdominal segment not extending as far as the tips of the cerci formed the basis of further assignment of these nymphs to the genus Pan tola Hagen, 1861. A slight- ly downward curved epiproct and a base of the lateral spine of the 9"' abdominal segment larger than one third of its length confirmed the nymphs as belonging to the species Pautala hymenaea (Say, 1839). This species, the spot-winged glider, shows a wide dis- tribution ranging south from southern Argentina north- wards to southern Canada, with occasional reports even from Alaska (Paulsen 2009). It has also been reported on Isabela island, where it is known to breed in temporary pools including brackish water habitats (Peck 1992, 2001). This, at least for odonates, highly unusual physiological tolerance is shared by most of the species found on the archipelago (Peck 2001) and may explain its presence as well in habitats like Cone Lake with its rather extreme wa- ter chemistry (see Muschiol & Traunspurger 2009 for de- tails). During the survey at Cone Lake, we also encountered several adult dragonflies around the lake, but were unable to catch one and thus cannot provide a reliable identifi- cation. Besides the odonates, individuals belonging to at least two species of chironomid larvae (Insecta: Diptera: Chironomidae) were observed during a qualitative macro- scopic examination of the benthos. Based on mentum mor- phology and the relative p
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