Haplosporidium pinnae sp. nov., a haplosporidan parasite associated with mass mortalities of the fan mussel, Pinna nobilis, in the Western Mediterranean Sea

Journal of Invertebrate Pathology
Gaetano CataneseA Villalba

Abstract

This study provides morphological and molecular characterization of a new species, Haplosporidium pinnae), very likely responsible for mass mortality of fan mussels, Pinna nobilis, in the Western Mediterranean Sea. The parasite was found in dead or moribund P. nobilis but did not occur in healthy fan mussels from locations that were not affected by abnormal mortality. Histological examination of infected fan mussels showed uninucleate cells of a haplosporidan parasite throughout the connective tissue and hemolymph sinuses of the visceral mass and binucleate cells and, rarely, multinucleate plasmodia were also detected in the connective tissue. Additionally, stages of sporulation occurred in the epithelium of the host digestive gland tubules. Spores were slightly ellipsoidal with a hinged operculum in one pole. Typical haplosporosomes were not found with TEM but vesicles with two concentric membranes resembling haplosporosomes were abundant in the cytoplasm of the multinucleate plasmodia occurring in host digestive gland tubules. SEM analysis showed multiple structures on the spore surface; some spores had two or four long tape-like filaments attached to the spore wall. Phylogenetic analysis based on the SSU rDNA sequence placed...Continue Reading

Citations

Aug 14, 2020·Environmental Monitoring and Assessment·Željko PavlinecSnježana Zrnčić
Dec 11, 2020·Marine Environmental Research·Patricia PradoJosé Rafael García-March
Apr 27, 2021·Biomarkers : Biochemical Indicators of Exposure, Response, and Susceptibility to Chemicals·İbrahim Ender KüniliUğur Altinağaç
Feb 4, 2022·Molecular Biology Reports·Gaetano CataneseRobert Bunet

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