Branchiobdellida are an order of leech-like clitellates that are mostly exoparasites of crayfish.
^ Taxonomic Considerations and Distribution of the Branchiobdellida (Annelida: Clitellata) on the North American Continent Stuart R. Gelder, Nicole L. Gagnon and Kerri Nelson Northeastern Naturalist Vol. 9, No. 4 (2002), pp. 451-468 Published by: Eagle Hill Institute Article Stable URL: https://www.jstor.org/stable/3858556