Description of Astasia
provided by BioPedia
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.
