First morphological and molecular characterization of cystacanths of Corynosoma evae Zdzitowiecki, 1984 (Acanthocephala: Polymorphidae) from Antarctic teleost fishes |
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| Affiliation: | 1. Institute of Parasitology, Biology Centre, Czech Academy of Sciences, Branišovská 31, 370 05 České Budějovice, Czech Republic;2. I. I. Schmalhausen Institute of Zoology NAS of Ukraine, B. Khmelnytsky Street, 15, Kyiv 01030, Ukraine;1. Guangdong Provincial Key Laboratory of Zoonosis Prevention and Control, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510542, China;2. Faculty of Veterinary Medicine, Suez Canal University, Ismailia 41522, Egypt;1. Biosecurity SA, Adelaide, SA 5001, Australia;2. School of Animal and Veterinary Sciences, The University of Adelaide, SA 5005, Australia;3. School of Agriculture, Food and Wine, The University of Adelaide, Adelaide, SA 5001, Australia;4. 22 Trevor Terrace Blackwood, SA 5051, Australia;5. Istituto Zooprofilattico Sperimentale della Lombardia e dell''Emilia Romagna and OIE Reference Laboratory for Rabbit Haemorrhagic Disease and for Myxomatosis, Via Bianchi 7/9, 25124 Brescia, Italy;6. Institute for Applied Ecology, University of Canberra, Bruce, ACT 2617, Australia;7. Australian National Wildlife Collection, National Research Collections CSIRO, Crace, ACT 2911, Australia;8. CSIRO Health & Biosecurity, Acton, ACT 2601, Australia;9. Invasive Species and Environment Biosecurity, Department of Primary Industries and Regional Development, Albany, WA 6330, Australia;10. Biosecurity Tasmania, Newtown, Tasmania 7008, Australia;11. NSW Department of Primary Industries, Orange, NSW 2800, Australia;12. Centre for Invasive Species Solutions, Bruce, ACT 2617, Australia;1. Department of Veterinary Parasitology, Lala Lajpat Rai University of Veterinary and Animal Sciences, Hisar, Haryana 125004, India;2. Parasitology Lab, ICAR-National Research Centre on Equines, Hisar, Haryana 125001, India;3. Department of Veterinary Physiology and Biochemistry, Lala Lajpat Rai University of Veterinary and Animal Sciences, Hisar, Haryana 125004, India;1. Verts Animal Hospital, 4-3-1 Morooka, Hakata-Ku Fukuoka-shi, 812-0894 Fukuoka, Japan;2. Laboratory of Veterinary Parasitic Diseases, Department of Veterinary Sciences, Faculty of Agriculture, University of Miyazaki, 1-1 Gakuen-kibanadai-nishi, 889-2192 Miyazaki, Japan;3. Center for Animal Disease Control, University of Miyazaki, 1-1 Gakuen-kibanadai-nishi, 889-2192 Miyazaki, Japan;4. Department of Parasitology, School of Veterinary Medicine, Rakuno Gakuen University, 582 Midorimachi, Bunkyodai, Ebetsu-shi 069-8501, Hokkaido, Japan;1. Schmalhausen Institute of Zoology; 15 Bohdana Khmelnytskoho Street, Kyiv 01030, Ukraine;2. African Amphibian Conservation Research Group, Unit for Environmental Sciences and Management, North-West University, Potchefstroom Campus; Private Bag X6001, Potchefstroom 20520, South Africa;3. South African Institute for Aquatic Biodiversity, Makhanda 6140, South Africa;4. Taras Shevchenko National University of Kyiv; Volodymyrska St, 60, Kyiv 01033, Ukraine |
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| Abstract: | Cystacanths of the polymorphid acanthocephalan Corynosoma evae Zdzitowiecki, 1984 were examined and redescribed based on newly collected material from teleost fishes from coastal waters of the Galindez Island (Argentine Islands, West Antarctica). Detailed morphological data, measurements and photomicrographs, including scanning electron microscopy images, are presented. Our morphological and morphometrical analyses confirmed the validity of C. evae; however, three key characteristics of taxonomic importance (i.e., the number of rows of hooks on the proboscis, and the number and arrangement of genital spines in males) showed significant morphological variability. In addition, a genital spine in the posterior body end of a female is reported for the first time. This study provides the first sequences of the small and large subunits nuclear ribosomal RNA genes (SSU and LSU) and the mitochondrial cytochrome c oxidase subunit 1 (cox1) for C. evae. Maximum likelihood and Bayesian inference analyses of the SSU + LSU + cox1 and the cox1 datasets placed C. evae as a sister lineage to a clade formed by C. validum Van Cleave, 1953 and C. villosum Van Cleave, 1953, although with low support. In contrast, the position of C. evae in the phylogenetic analysis of the SSU + LSU dataset remained unresolved. Finally, C. arctocephali Zdzitowiecki, 1984 from pinnipeds from the subantarctic and Antarctic regions is considered as a valid species. |
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