Unique ultrastructural characteristics of the tegument of the digenean blood fluke Aporocotyle simplex Odhner, 1900 (Digenea: Aporocotylidae), a parasite of flatfishes - Poddubnaya, L. G.; Hemmingsen, W.; Poddubny, S. A.; Gibson, D. I. (Parasitology Research, 2019)