Ten species of acanthocephalans are known from 30 species of fish in Lake Baikal. Three species in the family Echinorhynchidae were studied and reported: (1) Echinorhynchus salmonis Müller, 1784 ( = Metechinorhynchus salmonis (Müller 1784) Petrochenko, 1956), previously designated as Echinorhynchus salmonis baicalensis Bogolepova, 1957 (actually Dogiel and Bogolepova, 1957) that we consider invalid. Echinorhynchus s. baicalensis was studied from whitefish Coregonus lavaretus (Linnaeus, 1758) (Family Salmonidae) in Chivyrkui Bay and from Kessler's (sand) sculpin Leocottus kesslerii (Dybowski, 1874) (Family Cottocomephoridae) at Goryachinsk on the eastern shore of Lake Baikal in Pribaikalsk District, Republic of Buryatia. Our scanning electron microscopy observations demonstrate miniapical proboscis hooks, hooks with dorsal indentation, 2 anteroventral trunk bumps, and variable position of male and female gonopores, for the first time. (2) Echinorhynchus cinctulus (Porta, 1905) Amin, 2013 ( = Pseudoechinorhynchus borealis (von Linstow, 1901) Petrochenko, 1956) was studied from burbot, Lota lota (Linnaeus, 1758) (Family Lotidae) in Chivyrkui Bay and Khankh. The thorny hooks, inconsistencies in proboscis armature, hook size, dermal micropores, and position of male and female gonopores are reported. (3) Echinorhynchus truttae Schrank, 1788 ( = Metechinorhynchus truttae (Schrank, 1788) Petrochenko, 1956) was studied from L. kesslerii in Goryachinsk. Features of the proboscis, hooks, female gonopore, dermal micropores, and eggs are presented.
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Vol. 82 • No. 1