Richardson, L.R., 1971. A new species from Mexico of the Nearctic genus Percymoorensis, and remarks on the family Haemopidae. Can. J. Zool. 49 (8): 1095-1103.
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Richardson, L.R., 1971. Gastrostomobdellidae fam. nov. …. Bull. Nat. Sci. Mus. Tokyo 14 (4): 585-602.
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