Morphometric Variations of Discophrya elongata (Ciliophora, Suctorea) Attached to Two Different Species of Aquatic True Bugs (Hemiptera, Prosorrhyncha, Nepomorpha) - R. Mariсo-Pйrez; R. Mayйn-Estrada; R. Macip-Rнos; I. V. Dovgal (Zoodiversity, 2011)