DAO 44:137-142 (2001)  -  doi:10.3354/dao044137

Ultrastructural characterisation of Marteilia species (Paramyxea) from Ostrea edulis, Mytilus edulis and Mytilus galloprovincialis in Europe

Matt Longshaw1,*, Stephen W. Feist1, R. Anthony Matthews2, Antonio Figueras3

1Centre for Environment, Fisheries and Aquaculture Science (CEFAS) Weymouth Laboratory, Barrack Road, The Nothe, Weymouth, Dorset DT4 8UB, United Kingdom
2Department of Biological Sciences, University of Plymouth, Drakes Circus, Plymouth, Devon PL4 8AA, United Kingdom
3Instituto de Investigaciones Marinas-CSIC, Departmento de Biologìa y Patologìa de Organismos Marinos, Eduardo Cabello 6, 36208 Vigo, Spain

ABSTRACT: A focused ultrastructural study of Marteilia spp. found in cultured Ostrea edulis, Mytilus edulis and Mytilus galloprovincialis from France and Spain was conducted with emphasis placed on haplosporosomes, striated plate-like inclusions and spore wall morphology. Two types of haplosporosome were identified, sphaeroid and oblate, which were common to the parasite in all 3 host species. A total of 492 haplosporosomes were measured; those from the Marteilia sp. in Mytilus spp. were marginally smaller than those in Ostrea edulis. Spore wall morphology was found to vary depending on the state of maturity of the parasiteā€¹the more mature the parasite, the thicker the wall surrounding it. It is suggested that the current criteria used to distinguish M. maurini from M. refringens are invalid and that M. maurini was relegated to a junior synonym of M. refringens.


KEY WORDS: Marteilia refringens · Marteilia maurini · Ultrastructure


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