portrait
Astasia (a-stays-ee-a) is a colourless euglenid, probably having derived from a lineage with plastids. With one emergent flagellum (by which it can be distinguished from Distigma which is similar but has two emergent flagella. There is no mouth. Most of the refractile granules are polysaccharide storage materials. The clear area near the front of the cell is the region of the flagellar pocket (where the flagella attach to the cell) and contractile vacuole. The relatively homogeneous region in the centre of the cell is where the nucleus is located. Differential interference contrast. This picture was taken by David Patterson, Linda Amaral Zettler, Mike Peglar and Tom Nerad from cultures and other materials maintained at the American Type Culture Collection during 2001. Image copyright: D. J. Patterson, L Amaral-Zettler, M. Peglar and T. Nerad, image used under license to MBL (micro*scope).
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Astasia
From the collection
American Type Culture Collection
| Description of Astasia: Euglenid flagellate, colourless, osmotrophic, fusiform or elongated cells, a few species slightly flattened; one emergent flagellum; canal opening apical or subapical, 1963); no eyespot, no flagellar swelling; euglenoid movement often pronounced; occurring worldwide, mostly in freshwaters rich in organic matter, some marine; related phagotrophic forms are referred to Euglenopsis. Type species A. haematodes Ehrenberg, 1830. |
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