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Hydaticus modestus is perhaps the only species of Hydaticus found in Alberta. Adults are found throughout the province. The photo specimen is about 12 mm in length. Notice the prominent scutellum, a feature of Colymbetinae and Dytiscinae adults. Photograph: From page 388 of Clifford, Hugh F. 1991. Aquatic invertebrates of Alberta. University of Alberta Press, Edmonton, Alberta, 538 pages. (Source: University of Alberta BioDiTRL online database, accessed Dec. 7, 2015. Copyright restrictions apply.)