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Ultrastructual study and description of Paramyxoides nephtys gen. n., sp n. a parasite of Nephtys caeca (Fabricius, 1780) (Polychaeta : Nephtyidae)

Publiceringsår: 2005
Språk: Engelska
Sidor: 175-187
Publikation/Tidskrift/Serie: Acta Protozoologica
Volym: 44
Nummer: 2
Dokumenttyp: Artikel i tidskrift


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 mu m 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 Nephrys 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.


  • Biological Sciences
  • Paramyxoides nephtys gen. n.
  • Paramyxea
  • Nephtys caeca
  • Oresund
  • sporogony
  • polychaete parasite
  • sp n.


  • ISSN: 0065-1583

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