Please use this identifier to cite or link to this item:
https://www.arca.fiocruz.br/handle/icict/43939
Type
ArticleCopyright
Open access
Collections
- IOC - Artigos de Periódicos [12973]
Metadata
Show full item record
ULTRASTRUCTURAL OBSERVATIONS OF THE VITELLINE CELLS OF METAMICROCOTYLA MACRACANTHA (MONOGENEA, MICROCOTYLIDAE)
Monogenea
Microcotylidae
Ultraestrutura
Células vitelinas
Affilliation
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Helmintologia. Laboratório de Helmintos Parasitos de Peixes. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Helmintologia. Laboratório de Helmintos Parasitos de Peixes. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Helmintologia. Laboratório de Helmintos Parasitos de Peixes. Rio de Janeiro, RJ, Brasil.
Abstract
An electron microscopic study of the vitelline follicles of Metamicrocotyla macracantha (Alexander,
1954) Koratha,1955 showed that they are composed of cells in different stages of development. The
immature cells have a large nucleus, nucleolus, cytoplasm with free ribosomes and few mitochondria.
The developing vitelline cells present granules which are small in the early stages, increasing with
maturity. The mature cells have an extensive granular endoplasmic reticulum and droplets of shellprotein; with maturation, clusters of shell protein and yolk bodies are formed and released in the ciliated
vitelline ducts. Vitelline development is continuous and all of the cellular stages involved can be found in
each follicle.
Keywords in Portuguese
Metamicrocotyla macracanthaMonogenea
Microcotylidae
Ultraestrutura
Células vitelinas
Share