Flagelates.ppt

8/11/2019 Flagelates.ppt

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FLAGELLATES


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FLAGELLUM

An elongated, hair-like organelle used for

locomotion. At the ultra-structural level, 1

pair of central tubules and 9 pairs of

peripheral tubules are visible.


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UNDULATING MEMBRANE

A membranous structure which connects the

flagellum to the body of the parasite. It is

thrown into folds as the parasite moves,

giving it an undulating appearance.


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COSTA

A cytoplasmic thickening seen at the base of

the undulating membrane in some

flagellates.


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AXOSTYLE

A central supporting rod seen in some

flagellates.


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AMASTIGOTE

Also known as the leishmanial stage. It is

round or oval in shape without any free

flagella.


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PROMASTIGOTE

Also known as the leptomonad stage. It is

elongated with the kinetoplast anterior and

distal to the nucleus. The flagellum emerges

from the anterior end. There is no undulating

membrane.


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EPIMASTIGOTE

Also known as crithidial stage. It is

elongated with the kinetoplast anterior and

close to the nucleus. There is a short

undulating membrane.


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TRYPOMASTIGOTE

Also known as the trypanosome stage. If is

elongated with the kinetoplast posterior and

distal to the nucleus. There is a long

undulating membrane.


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AXONEME

A delicate filament extending from the

region of the kinetoplast to the cell

membrane. It represents the cytoplasmic

part of the flagellum.


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KINETOPLAST

An oval or rod-shaped body seen in

haemoflagellates. If stains with nuclear dyes

and contains DNA. It is regarded as a

modified part of the mitochondrium.


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PLEOMORPHIC

When a number of morphological types

occur in one life cycle.


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MONOMORPHIC

When a single morphological type occurs in

one life cycle.


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METACYCLIC TRYPANOSOME

Infective forms of trypanosomes which

develop in the vector.


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Giard ia spp .


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Trichomonas vaginalis


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Trypomastigote Epimastigote Promastigote Amastigote

Leishmania spp .

Animalhost Absent Absent AbsentPresent

Vector Absent Absent Present Absent

Trypanosom a spp . African

Animal

host

Present Absent Absent Absent

Vector Present Present Absent Absent

Trypanosoma cruzi

Animal

host

Present Present Absent Present

Vector Present Present Absent Absent


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Leishman ia spp .


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AFRICAN TRYPANOSOMIASIS


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AMERICAN TRYPANOSOMIASIS


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Flagelates.ppt

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