R. A. Bray, G. N. Foster, A. Waeschenbach, and D. T. J. Littlewood, “The discovery of progenetic Allocreadium neotenicum Peters, 1957 (Digenea: Allocreadiidae) in water beetles (Coleoptera: Dytiscidae) in Great Britain”, Zootaxa, vol. 3577, no. 1, pp. 58–70, Dec. 2012.