The article presents the results of the investigation of material on the genus Centrorhynchus Lühe, 1911 stored in the collection of the Department of Parasitology, Schmalhauzen Institute of Zoology, National Academy of Sciences of Ukraine. Five species: Centrorhynchus aluconis, C. globocaudatus, C. spinosus, C. conspectus and C. polissiensis sp. n. were studied and described. Centrorhynchus polissiensis sp. n., differs from all known species by the complex morphological characters, in particular, by the formula of proboscis hooks in combination with the number of large hooks with roots, by the number of hooks in anterior part of the proboscis, and by comparatively smaller eggs. C. polissiensis sp. n. is most similar to C. aluconis, C. conspectus and C. globocaudatus. The main differences between the species are in the proboscis armament, 13–17 hooks in a longitudinal row in C. aluconis, 16–18 hooks in C. conspectus vs 19–20 hooks in C. polissiensis sp. n., and in the egg sizes, 56–65 × 28–30 for C. aluconis, 68–72 × 33–35 for C. conspectus vs 45–55 × 25 for C. polissiensis sp. n. C. polissiensis sp. n. differs from C. globocaudatus in shape and morphology of the proboscis hooks. We do not confirm the record of C. amphibius from birds of the territory of Ukraine. The data on synonymy, hosts and distribution in Ukraine and in the world are given for seven species of the genus recorded in Ukraine. Illustrated descriptions about the material of collection are presented for five species. We provide an identification key for nine species of the genus Centrorhynchus of the birds of the fauna of Ukraine and adjacent territories.
To increase the currently limited knowledge addressing acanthocephalans parasitizing California sea lions (Zalophus californianus), 33 animals including pups, juvenile and adult males and females from the Marine Mammal Center (TMMC), Sausalito, California, USA were examined. Totally, 2,268 specimens of acanthocephalans representing five species from the genera Andracantha (A. phalacrocoracis and Andracantha sp.), Corynosoma (C. strumosum and C. obtuscens) and Profilicollis (P. altmani) were found. Profilicollis altmani and A. phalacrocoracis, predominantly parasitize fish-eating birds; they were registered in Z. californianus for the first time. Prevalence and intensity of California sea lion infection and transmission of acanthocephalans in these hosts of different age groups were analyzed and discussed. We provide brief morphological descriptions of the five species of acanthocephalan found in California sea lions.
Thirty-eight Mallards were collected on the territory of Ukrainian Polissia to study the fauna of their gastro-intestinal helminths. Materials were collected in 1998-2000, 2014 and 2016 on the territory of Volyn and Chernihiv Regions. In total, 33 species of helminths were found. Th e prevalence of cestode infection was 78.9 %. We found 18 cestode species: Aploparaksis furcigera, Cloacotaenia megalops, Dicranotaenia coronula, Diorchis acuminatus, D. stefanskii, Fimbriaria fasciolaris, F. teresae, Microsomacanthus compressa, M. spiralibursata, M. paracompressa, M. paramicrosoma, M. parvula, M. hopkinsi, Platyscolex ciliata, Retinometra venusta, Sobolevicanthus aculeostyleticus, S. gracilis, S. stolli. Th e prevalence of trematode infection was 73.7 %. Th ere were 10 trematode species: Bilharziella polonica, Apatemon gracilis, Echinoparyphium aconitum, E. cinctum, Echinostoma revolutum group, Hypoderaeum conoideum, Notocotylus attenuatus, Parastrigea robusta, Prosthogonimus ovatus, P. cuneatus.Th e prevalence of nematode infection was 7.9 %. Th ere were four nematode species: Capillaria anatis, Capillariidae gen. sp., Eucoleus contorta, Tetrameres fi ssispina. Th e prevalence of an acanthocephalan Filicollis anatis was 18.4 %. Th e most common species of helminths were A. furcigera, B. polonica, A. gracilis, Echinostoma revolutum group, F. fasciolaris, H. conoideum. Th e helminth faunas of Mallards from the territory of Ukrainian Polissia and from the Black Sea Region of Ukraine were compared. Th e results of comparison demonstrated a high level of their qualitative similarity.