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Morphological Variability of Plagiorhynchus (Prosthorhynchus) Cylindraceus (Acanthocephala, Plagiorhynchidae) and Its Importance in Assessment of Taxonomy Structure of the Subgenus Morphological variability in cystacanths and adults of P. (P.) cylindraceus (Goeze, 1782) Schmidt et Kuntz, 1966, type material of P. (P.) gallinagi Schachtachtinskaja, 1953 and P. (P.) gracilis Petrochenko, 1958 were studied. Data on intermediate hosts, definitive hosts and distribution of some species from the subgenus Prosthorhynchus were summarized. The taxonomy of the subgenus is discussed and names P. (P.) formosus Van Cleave, 1918, P. (P.) genitopapillatus Lundström, 1942, P. (P.) transversus Rudolphi, 1819, P. (P.) gallinagi and P. (P.) gracilis are placed as synonyms of P. (P.) cylindraceus. Морфологическая изменчивость Plagiorhynchus (Prosthorhynchus) cylindraceus (Acanthocephala, Plagiorhynchidae) и ее значение для оценки таксономической структуры подрода Изучена морфологическая изменчивость цистакантов и взрослых форм P. (P.)cylindraceus (Goeze, 1782) Schmidt et Kuntz, 1966, типовой материал P. (P.) gallinagi Schachtachtinskaja, 1953 и P. (P.) gracilis Petrochenko, 1958, обобщены данные о промежуточных, дефинитивных хозяевах и распространении ряда видов подрода Prosthorhynchus. Обсуждается таксономическая структура подрода. Подтверждена инвалидность названий P. (P.) formosus Van Cleave, 1918, P. (P.) genitopapillatus Lundstrom, 1942, P. (P.) transversus Rudolphi, 1819. Предлагается рассматривать P. (P.) gallinagi и P. (P.) gracilis синонимами P. (P.) cylindraceus.

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Morphological Variability of Plagiorhynchus (Prosthorhynchus) Cylindraceus (Acanthocephala, Plagiorhynchidae) and Its Importance in Assessment of Taxonomy Structure of the Subgenus