Supriya Ghosh (Editor)

Nassula

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Domain  Eukaryota
Class  Nassophorea
Family  Nassulidae
Rank  Genus
Subphylum  Intramacronucleata
Order  Nassulida
Phylum  Ciliophora
Nassula Protist Images Nassula
Similar  Nassophorea, Phyllopharyngea, Tokophrya, Coleps, Colpodea

Nassula ciliado


Nassula is a genus of unicellular ciliates, belonging to the class Nassophorea. Like other members of the class, Nassula possesses a basket-like feeding apparatus (nasse, or cyrtos) made up of cytopharyngeal rods (nematodesmata), which are themselves composed of closely packed microtubules. Nassula use this structure to ingest filamentous cyanobacteria, drawing individual strands of blue-green algae through the cytopharynx and into the body of the cell, where they are digested. As the algae are broken down, they can take on a variety of bright colours, which give Nassula a distinctive, variegated appearance under the microscope.

Contents

Nassula Protist Images Nassula

La alimentacion de nassula


Description

Nassula Protist Images Nassula

The body is ovoid to elongate, and uniformly ciliated, with a single macronucleus and a partial hypostomial frange (synhymenium) running from the left side of the cell to the oral aperture. When food is scarce, members of the genus have the ability to become dormant by forming a microbial cyst. Excystment can be induced by exposure to a medium inoculated with wild bacteria.

Reproduction

Nassula httpsuploadwikimediaorgwikipediacommonsthu

Nassula reproduce asexually, by fission. During reproduction, the cell is divided transversally. As in most ciliates (with the exception of the Karyorelictea) the macronucleus splits, during division, and the micronuclei also undergo mitosis.

Nassula Nassula Droplet Photo Gallery

While fission is an asexual process, it may be preceded by conjugation, during which compatible mating individuals come together and transfer genetic material across a cytoplasmic link. In conjugation, the micronuclei of each cell undergo meiosis, and haploid micronuclei are then exchanged from one cell to the other. After sexual exchange has occurred, both conjugants will divide by fission.

Nassula Protist Images Nassula

References

Nassula Wikipedia


Similar Topics
Coleps
Colpodea
Nassophorea
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