Observations on the intracytoplasmic microsporidian Steinhausia mytilovum, a parasite of mussel (Mytella guyanensis) occytes from the Amazon river estuary
Braz. j. morphol. sci
;
22(4): 183-186, Oct.-Dec. 2005. ilus
Article
Dans Anglais
| LILACS
| ID: lil-468024
ABSTRACT
Microsporidians (Microsporidia) can parasitize commercially important marine mollusks, including bivalves. In this report, we provide a brief description of the ultrastructure of the microsporidian Steinhausia mytilovum that occurs in the oocyte cytoplasm of the mussel Mytella guyanensis (Mollusca, Bivalvia, Mytillidae) from the Amazon river estuary. Mussel ovaries were fixed, stained and examined using differential interference contrast optics (DIC). The parasite developed in an intracytoplasmic vacuole containing a variable number of spores (up to 14). Mature spores were 2.3 ± 0.3 ìm long and 1.7 ± 0.3 ìm wide (n = 25 each). Transmission electron microscopy revealed two types of intracytoplasmic vacuoles, one containing spores with a light (less dense) cytoplasm that corresponded to the maturation phases, and the other containing mature, dense, granular spores that showed specific microsporidian structures. The anchoring disc and the anterior zone of the polar filament were surrounded by the polaroplast. The polar filament was isofilar and consisted of a double (rarely triple) coil with 9-10 turns. The ultrastructural morphology of these spores suggested that they belonged to S. mytilovum.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Bivalvia
/
Microsporidia
Pays comme sujet:
Amérique du Sud
/
Brésil
langue:
Anglais
Texte intégral:
Braz. j. morphol. sci
Thème du journal:
Anatomie
Année:
2005
Type:
Article
Pays d'affiliation:
Brésil
/
Portugal
Institution/Pays d'affiliation:
Federal Rural University of Amazonia/BR
/
Federal University of Pará/BR
/
University of Porto/PT
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