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Ruiz-Escobar, Fernando; Oceguera-Figueroa, Alejandro. (2019). A new species of Branchellion Savigny, 1822 (Hirudinida: Piscicolidae), a marine leech parasitic on the giant electric ray Narcine entemedor Jordan & Starks (Batoidea: Narcinidae) off Oaxaca, Mexico. Systematic Parasitology. efirst: 1-10.