A new actinospore type Unicapsulactinomyxon (Myxozoa), infecting the marine polychaete, Diopatra neapolitana (Polychaeta: Onuphidae) in the Aveiro Estuary (Portugal)

作者：Rangel Luis F; Cech Gabor; Szekely Csaba; Santos Maria J^*

来源：Parasitology, 2011, 138(6): 698-712.

DOI：10.1017/S0031182011000163

• Myxozoa
• actinospores
• Unicapsulactinomyxon
• developmental stages
• SSU rDNA
• Diopatra neapolitana
• polychaete
• prevalence
• Portugal

This work reports a new type of actinospore, Unicapsulactinomyxon, which exhibits a unique morphological characteristic in that it has a single and large polar capsule (9.3x4.1 mu m) (which possesses a longitudinally-folded polar filament) instead of the 3 polar capsules previously described for actinosporeans. The spore has a binucleated sporoplasm and 3 valves, each of which forms a long process. The spore has a total length of 241.3 mu m. This parasite develops in groups of 8 inside pansporocysts in the coelomic cavity of the polychaete host. Molecular investigations on the SSU rDNA show that the new actinospore type is most closely related to Enteromyxum species (81-84% similarity). A survey of actinospore infections of the marine polychaete Diopatra neapolitana in 2007 and 2009, in the Aveiro Estuary (Portugal), showed an annual prevalence of 1.0% and 0.3%, respectively.

• 出版日期2011-5