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Ultrastructual Study and Description of Paramyxoides nephtys gen. n., sp. n. a Parasite of Nephtys caeca (Fabricius, 1780) (Polychaeta: Nephtyidae)
並列摘要
The new paramyxean Paramyxoides nephtys gen. n., sp. n. is described based on cytological characters. The organism reproduces by endogenous budding, and sporogony is the only sequence of reproduction observed. A primary cell with narrow haplosporosomes gives rise to two or four secondary cells (sporonts), each yielding four tetracellular spores in which the cells are situated one within the other. Spores fusiform, about 10 μm long, arranged with the long axes in parallel to a fusiform to globular body with terminal, striated projections. Nuclei are arranged in a line. Two of the spore cells (cells 4-5) have haplosporosomes. Haplosporosomes of cell 4 are spherical, measuring 80-300 nm in diameter, of cell 5 rod-like 70-100 nm wide. The host is the polychaete Nephtys caeca, and the parasite develops intracellularly in the gut epithelium in direct contact with the cytoplasm of the host cell. About 3% of studied hosts harboured the parasite. This is the first report of Paramyxea from Scandinavia.
並列關鍵字
Nephtys caeca ； Øresund ； Paramyxea ； Paramyxoides nephtys gen. n. ； sp. n. ； polychaete parasite ； sporogony延伸閱讀
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