Burreson, E. M., & Segonzac, M. (2006). Morphological variability of Bathybdella sawyeri (Hirudinida: Piscicolidae) from hydrothermal vents on the Galápagos Rift and the South East Pacific Rise. Zootaxa, 1286(1), 15–21. https://doi.org/10.11646/zootaxa.1286.1.2