Revealing the hidden diversity of Gyrodactylus communities (Monogenea, Gyrodactylidae) from Nearctic Catostomidae and Leuciscidae fish hosts (Teleostei, Cypriniformes), with descriptions of ten new species.

Marginal hooks total length 33.4 (27.4–37.0; n = 4); sickle moderately significant, almost triangular with globose heel, thick triangular toe, inconspicuous shelf; sickle proper almost as thick as toe base, shaft length 3.9 (3.3–5.0; n = 4); sickle length to shaft attachment 4.8 (4.6–5.1; n = 4); sickle proximal width 3.7 (3.4–3.9; n = 4); sickle distal width 3.1 (2.7–3.4; n = 4); thin and slightly curved point, length 1.6 (1.4–1.8; n = 4); filament loop extending about 1/2 handle length, length 8.5 (8.1–9.0; n = 4); handle length 31.6 (31.1–32.6; n = 4).

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