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Alainites muticus (Linnaeus, 1758) = Baetis sp. cf. niger (Linnaeus, 1761) in Lavandier (1979). DIFF. B. cf. niger, currently named Nigrobaetis niger (Linnaeus, 1761) was listed in the 70 ’ s but not in 2022, contrary to A. muticus, a morphologically similar species. A. muticus is present in the Pyrenees at high altitudes, while N. niger seems absent from this mountain range (Opie-benthos 2026). Following discussions with Alain Thomas and Pierre Lavandier, we assert that Baetis cf. niger corresponds to A. muticus in Lavandier’s dataset and therefore correct Baetis sp. cf. niger for A. muticus.
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Launay et al. (2026) studied this question.
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