Abstract
This paper describes the previously unknown larvae of Sericostoma bergeri and S. herakles (Trichoptera: Sericostomatidae) restricted to European Ecoregion 6 (= Hellenic western Balkan). Information on the morphology of the larvae is given, and the most important diagnostic features are illustrated. Sericostoma bergeri and S. herakles can be easily separated from known sericostomatid larvae of Ecoregion 6 (Schizopelex huettingeri, Oecismus monedula, Sericostoma flavicorne and S. personatum) by the shape of the pronotum, presence or lack of a comma-like marking on the lateral protuberance, by the number of setae on abdominal dorsum IX, and by distribution patterns. With respect to the latter, S. bergeri is a micro-endemic of the Greek Islands of Euboea and Andros whereas S. herakles is an endemic of the Peloponnese. The species are integrated in a dichotomous key including the currently known Sericostomatidae larvae of the Hellenic western Balkan. In addition, ecological information on the two species is provided.
Highlights
From Europe, 18 species of genus Sericostoma Latreille, 1825 are known (Graf et al 2008; Malicky 2004, 2005a, b, 2014), with four species present in European Ecoregion 6 (= Hellenic western Balkan)
Hans Malicky managed to collect larvae and adults of the two remaining Sericostoma species of Ecoregion 6: S. bergeri Malicky, 1973 from the Greek islands of Euboea and Andros and S. herakles Malicky, 1999 from the Peloponnese. This material enabled us to infer reliable diagnostic characters for the larval description and to use this information for integrating the two species in the key of the previously known Sericostomatidae larvae of the Hellenic western Balkan provided by Karaouzas and Waringer (2017)
One final instar larva and numerous adults of S. herakles were obtained by the same collector at Kefalarion, Peloponnese, Greece (37°54'N, 22°31'E, 670 m a.s.l.) on 19 May 1974
Summary
From Europe, 18 species of genus Sericostoma Latreille, 1825 are known (Graf et al 2008; Malicky 2004, 2005a, b, 2014), with four species present in European Ecoregion 6 (= Hellenic western Balkan). Hans Malicky managed to collect larvae and adults of the two remaining Sericostoma species of Ecoregion 6: S. bergeri Malicky, 1973 from the Greek islands of Euboea and Andros and S. herakles Malicky, 1999 from the Peloponnese. Pronotum with convex ventral border; anterolateral pronotal corner short and knob-like; with black comma-like marking on lateral protuberance; setal counts on abdominal dorsum IX 18–41.
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