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Diseases of Aquatic Organisms

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DAO 110:55-63 (2014)  -  DOI:

Contribution to the DAO Special: 'Microcell parasites of molluscs'

Ultrastructural comparison of Bonamia spp. (Haplosporidia) infecting ostreid oysters

P. M. Hine1,6,*, R. B. Carnegie2, M. A. Kroeck3, A. Villalba4, M. Y. Engelsma5, E. M. Burreson

1Investigation and Diagnostic Centre, Biosecurity New Zealand, PO Box 40-742, Upper Hutt 6007, New Zealand
2Virginia Institute of Marine Science, College of William & Mary, PO Box 1346, Gloucester Point, Virginia 23062, USA
3LABPAT-IBMP (L 709), Instituto de Biolog?a Marina y Pesquera ?Alte. Storni?, Universidad Nacional del Comahue (8520), San Antonio Oeste, Rio Negro, Argentina
4Centro de Investigaci?ns Mari?as, Conseller?a do Medio Rural e do Mar, Xunta de Galicia, Aptdo. 13, 36620 Vilanova de Arousa, Spain
5Central Veterinary Institute of Wageningen UR, PO Box 65, 8200 AB Lelystad, The Netherlands
6Present address: 73, rue de la F?e au Bois, 17450 Fouras, France
*Corresponding author:

ABSTRACT: The ultrastructure of Bonamia from Ostrea angasi from Australia, Crassostrea ariakensis from the USA, O. puelchana from Argentina and O. edulis from Spain was compared with described Bonamia spp. All appear conspecific with B. exitiosa. The Bonamia sp. from Chile had similarities to the type B. exitiosa from New Zealand (NZ), but less so than the other forms recognized as B. exitiosa. Two groups of ultrastructural features were identified; those associated with metabolism (mitochondrial profiles, lipid droplets and endoplasmic reticulum), and those associated with haplosporogenesis (Golgi, indentations in the nuclear surface, the putative trans-Golgi network, perinuclear granular material and haplosporosome-like bodies). Metabolic features were regarded as having little taxonomic value, and as the process of haplosporogenesis is not understood, only haplosporosome shape and size may be of taxonomic value. However, the uni-nucleate stages of spore-forming haplosporidians are poorly known and may be confused with Bonamia spp. uni-nucleate stages. The many forms of NZ B. exitiosa have not been observed in other hosts, which may indicate that it has a plastic life cycle. Although there are similarities between NZ B. exitiosa and Chilean Bonamia in the development of a larger uni-nucleate stage and the occurrence of cylindrical confronting cisternae, the clarification of the identity of Chilean Bonamia must await molecular studies.

KEY WORDS: Review · Bonamia spp. · Haplosporidians · Ultrastructure · Taxonomy

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Cite this article as: Hine PM, Carnegie RB, Kroeck MA, Villalba A, Engelsma MY, Burreson EM (2014) Ultrastructural comparison of Bonamia spp. (Haplosporidia) infecting ostreid oysters. Dis Aquat Org 110:55-63.

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