Virginia Institute of Marine Science
The platyhelminth, Udonella, lives on parasitic copepod crustaceans and, according to the present system of classification belongs to monogenetic trematodes (Monogena) among which it is usually placed in the group Monopisthocotylea (Fuhrmann, 1928; Bychowsky, 1937; Dawes, 1946; Sproston, 1946). However, the morphology of Udonella has not yet been studied thoroughly by anyone, and a number of unusual features of the structure, ontogenesis and biology of this form cause doubts with regard to its belonging to the Monogena.
Originally published in Parasitological Collection of the Institute of Zoology, Academy of Sciences, USSR (XIV, p. 112-163, 1952). Maria Kassatkin & Serge Kassatkin translators; J.E. Simmons, W.J. Hargis,Jr. and D.E. Zwerner, editors.
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Ivanov, A. V. (1981) Morphology of Udonella caligorum Johnston, 1835, and the position of Udonellidae in the systematics of platyhelminths. Translation Series. Virginia Institute of Marine Science, College of William and Mary. https://scholarworks.wm.edu/reports/31