Perkins, P. D. “Revisions of the Genera Parhydraena Orchymont, Protozantaena Perkins, Decarthrocerus Orchymont, and Parhydraenopsis Nomen Novum, Aquatic and Humicolous Beetles from Africa and Madagascar, and Comparative Morphology of the Tribe Parhydraenini (Coleoptera: Hydraenidae)”. Zootaxa, vol. 2038, no. 1, Mar. 2009, pp. 1–119, doi:10.11646/zootaxa.2038.1.1.