title: A new actinospore type Unicapsulactinomyxon (Myxozoa), infecting the marine polychaete, Diopatra neapolitana (Polychaeta: Onuphidae) in the Aveiro Estuary (Portugal).
abstract: 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 (9·3×4·1 μm) (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 μm. 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.
authors.affiliation: CIMAR - Laboratório Associado/CIIMAR - Centro Interdisciplinar de Investigação Marinha e Ambiental, Rua dos Bragas, 177, 4050-123 Porto, Portugal.
authors.forename: Luís F
authors.initials: LF
authors.lastname: Rangel
authors.affiliation: Fish Pathological Research Team, Veterinary Medical Research Institute, Hungarian Academy of Sciences 1143, Budapest, Hungária krt. 21, Hungary.
authors.forename: Gábor
authors.initials: G
authors.lastname: Cech
authors.affiliation: Fish Pathological Research Team, Veterinary Medical Research Institute, Hungarian Academy of Sciences 1143, Budapest, Hungária krt. 21, Hungary.
authors.forename: Csaba
authors.initials: C
authors.lastname: Székely
authors.affiliation: CIMAR - Laboratório Associado/CIIMAR - Centro Interdisciplinar de Investigação Marinha e Ambiental, Rua dos Bragas, 177, 4050-123 Porto, Portugal.
authors.forename: Maria J
authors.initials: MJ
authors.lastname: Santos
mesh_terms: D000818:Animals; D063366:Estuaries; D008969:Molecular Sequence Data; D055764:Myxozoa / Q000145:classification* / Q000166:cytology / Q000235:genetics / Q000502:physiology* / Q000648:ultrastructure; D010802:Phylogeny; D011077:Polychaeta / Q000469:parasitology*; D011174:Portugal; D012337:RNA, Ribosomal, 18S / Q000235:genetics; D012621:Seasons; D013045:Species Specificity
chemical_list: D012337:RNA, Ribosomal, 18S