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Issue: Vol. 5692 No. 3: 15 Sept. 2025
Type: Article
Published: 2025-09-15
DOI: 10.11646/zootaxa.5692.3.1
Page range: 401-445
Abstract views: 47
PDF downloaded: 2

The Rhyacophila fasciata Species Complex (Trichoptera: Rhyacophilidae) in France and Switzerland, with description of a new species, Rhyacophila caussensis Valladolid & Coppa sp. nov. from France, based on morphological, genetic and ecological evidence

Department of Biodiversity and Evolutionary Biology; Museo Nacional de Ciencias Naturales (MNCN-CSIC); c/ José Gutiérrez Abascal; 2; 28006 Madrid; Spain
Institute of Agricultural Sciences (ICA-CSIC); c/ Serrano 115; dpdo.; 28006 Madrid; Spain
1; rue du Courlis; 08350 Villers-sur-Bar; France
Petit-Berne 2; CH-2035 Corcelles; Switzerland
Department of Collections; Museo Nacional de Ciencias Naturales (MNCN-CSIC); c/ José Gutiérrez Abascal; 2; 28006 Madrid; Spain
Department of Collections; Museo Nacional de Ciencias Naturales (MNCN-CSIC); c/ José Gutiérrez Abascal; 2; 28006 Madrid; Spain
Trichoptera Morphology imago mitochondrial COI ecology distribution France Switzerland

Abstract

The study of adult specimens belonging to the Rhyacophila fasciata Species Complex from mainland France has shown the presence of several different species: Rhyacophila denticulata McLachlan 1879 and Rhyacophila sociata Navás 1916 in the Pyrenees, Rhyacophila loeffleri Valladolid & Waringer 2023 in the northeast, and Rhyacophila septentrionis McLachlan 1865, widely distributed, mainly in the east. New data show that Switzerland harbours two species, R. septentrionis McLachlan 1865 in the Jorat region and western Jura Mountains and R. loeffleri Valladolid & Waringer 2023 in the remaining part of the country. A new species, Rhyacophila caussensis Valladolid & Coppa, sp. nov., from southeast France is described from male and female adults. We also present molecular mtCOI data, including novel sequences from specimens collected in France and Switzerland, and compare sequences of R. caussensis with corresponding data from R. fasciata, R. denticulata, R. sociata, R. loeffleri and R. septentrionis, as well as with the other species in the Complex: Rhyacophila kykladica Malicky & Sipahiler 1993, Rhyacophila delici Kučinić & Valladolid 2020, Rhyacophila viteceki Valladolid & Kučinić 2020, Rhyacophila macedonica Karaouzas, Valladolid & Ibrahimi 2022, and Rhyacophila anatolica Ekingen & Valladolid 2024. Our study revealed morphological differences between R. fasciata and R. caussensis, as well as genetic differences among the other taxa of the Rhyacophila fasciata Species Complex, supporting the recognition of R. caussensis as a new species.

 

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How to Cite

Valladolid, M., Arauzo, M., Coppa, G., Reding, J.-P.G., Dorda, B.A. & Rey, I. (2025) The Rhyacophila fasciata Species Complex (Trichoptera: Rhyacophilidae) in France and Switzerland, with description of a new species, Rhyacophila caussensis Valladolid & Coppa sp. nov. from France, based on morphological, genetic and ecological evidence. Zootaxa, 5692 (3), 401–445. https://doi.org/10.11646/zootaxa.5692.3.1