Synopsis
Evidence is presented which suggests that the nonparasitic lamprey, Lampetra (Eudontomyzon) gracilis Kux, 1965, is conspecific with the parasitic lamprey Eudontomyzon danfordi Regan, 1911. The diagnostic characters of the holotype and of the non-type material of E. gracilis are features found in E. danfordi specimens in their second and final year of adult life, thereby making the former a junior synonym of the latter.
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Renaud, C.B., Holčík, J. Lampetra (Eudontomyzon) gracilis, a synonym of Eudontomyzon danfordi . Environ Biol Fish 23, 127–130 (1988). https://doi.org/10.1007/BF00000742
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DOI: https://doi.org/10.1007/BF00000742