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Byttebier, B. and Torres, P.L.M. 2009. Description of the preimaginal stages of Enochrus (Hugoscottia) variegatus (Steinheil, 1869) and E. (Methydrus) vulgaris (Steinheil, 1869) (Coleoptera: Hydrophilidae), with emphasis on larval morphometry and chaetotaxy. Zootaxa. 2139, 1 (Jun. 2009), 1–22. DOI:https://doi.org/10.11646/zootaxa.2139.1.1.