On the Trichoptera of Western Europe, with revisiting the Anisogamus and Sericostoma genera (Trichoptera)

Oláh, János and Vinçon, Gilles (2026) On the Trichoptera of Western Europe, with revisiting the Anisogamus and Sericostoma genera (Trichoptera). OPUSCULA ZOOLOGICA (BUDAPEST), 57 (1). pp. 47-72. ISSN 0237-5419

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Abstract

In this paper on the Trichoptera of Western Europe, we describe four new species: Wormaldia atesina sp. nov.,Hydropsyche loirensis sp. nov., Drusus mirus sp. nov. and Anisogamus cottius sp. nov. Our unfortunate combinations ofChaetopteryx kimera Oláh & Vinçon, 2021 and Consorophylax kimera (Oláh & Vinçon, 2021) was corrected as Acrophylaxzerberus Brauer, 1867. Revisiting the Anisogamus and Sericostoma genera the species status of Anisogamus noricanusMcLachlan, 1875 and Anisogamus nurianus (Navas, 1917) were reinstated. In Sericostoma genus three species groups andthree species complexes were re-diagnosed with their paraproct atlas of species: (1) Sericostoma schneideri species groupwith two armed deeply furcated paraproct composed of ten species: schneideri, alakir, dimcay, flavicorne, ida,mesopotamicum, pinargozu, taskent, yuvarlakcay. (2) Sericostoma personatum species group with two armed shallowlyfurcated paraproct composed of nine species in three species complexes. Sericostoma personatum species complex:personatum, pedemontanum, subaequale, unaequale. Sericostoma maclachlanianum species complex with two-armedextremely widely opened abbreviated paraproct, dorsal arm longer: maclachlanianum, sasbaddes. Sericostoma vittatumspecies complex with two-armed widely opened paraproct, dorsal arm with or without dorsal subapical elevation: baeticum,heracles, vittatum. (3) Sericostoma galeatum species group with lanceolate paraproct also composed of eight species:galeatum, bergeri, cianficconiae, clypeatum, confusum, grusiense, italicum, romanicum, siculum. We have established thevariability ranges with presenting the paraproct that is the key speciation trait for the baeticum-vittatum and pedemontanumpersonatum siblings, as well as for the widely distributed and taxonomically debated species, Sericostoma schneideri.Examining the paraproct of 22 populations from Britain and 5 populations from Ireland in context of larval findings, we havedemonstrated by adult trait matrixes the presence of Sericostoma personatum (Spence, 1826) and the absence of Sericostomaschneideri (Kolenati, 1848) on The British Islands.

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