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Light and electron microscopic study of the myxosporean, Henneguya friderici n. sp. from the Amazonian teleostean fish, Leporinus friderici

Published online by Cambridge University Press:  30 April 2003

G. CASAL ,
E. MATOS  and
C. AZEVEDO
G. CASAL
Affiliation:
Department of Biological Sciences, High Institute of Health Sciences, 4580 Paredes, Portugal CIIMAR-Centre for Marine and Environmental Research, University of Oporto, 4150-180 Porto, Portugal
E. MATOS
Affiliation:
Laboratory of Animal Biology, Faculty of Agricultural Sciences, Belém, Brazil
C. AZEVEDO
Affiliation:
Department of Cell Biology, Institute of Biomedical Sciences, University of Oporto, 4099-003 Porto, Portugal CIIMAR-Centre for Marine and Environmental Research, University of Oporto, 4150-180 Porto, Portugal
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Abstract

A new histozoic species of myxosporean was found to infect the gill filaments, gut, kidney and liver of the freshwater teleost Leporinus friderici, collected from the estuarine region of the Amazon, near the city of Belém, Brazil. The plasmodia show asynchronous development, at any one time composed of mature spores and all sporogonic stages. The ellipsoidal spore body, measuring 10·4 μm long and 5·7 μm wide, consists of 2 equal shell valves adhering together along the straight suture line. Each valve has a caudal process measuring 23·3 μm in length. There are 2 symmetric polar capsules, without intercapsular appendix, measuring 5·0 μm×2·1 μm, and each has a polar filament with 7–8 coils. In general, ultrastructural details of sporoblast and spore development are in agreement with previously described myxosporeans. Some ultrastructural aspects such as cellular alterations of the pericyte in the different organs infected and characterization of the sporoplasmosomes during the sporoplasm maturation are described. This parasite was studied under light and electron microscope and compared with others species of the genus Henneguya, considering also host specificity. From our observations we propose the creation of a new species, Henneguya friderici n. sp.

Keywords

ultrastructureMyxozoaHenneguya friderici n. sp.parasiteAmazonian fish
Type
Research Article
Information
Parasitology , Volume 126 , Issue 4 , April 2003 , pp. 313 - 319
Copyright
© 2003 Cambridge University Press

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