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Schematic representation of a Euglena cell with red eyespot (9) Schematic representation of a Chlamydomonas cell with chloroplast eyespot (4). The eyespot apparatus (or stigma) is a photoreceptive organelle found in the flagellate or (motile) cells of green algae and other unicellular photosynthetic organisms such as euglenids.
Key: 1. Microtubules that make up the pellicle (see 9.) 2. Contractile Vacuole 3. Stigma / Eyespot 4. Flagella 5. Reservoir 6. Photoreceptor / Paraflagellar Body 7. Basal Bodies 8. Chloroplast 9. Pellicle 10. Nucleus 11. Nucleolus
Euglena is a genus of single cell flagellate eukaryotes.It is the best known and most widely studied member of the class Euglenoidea, a diverse group containing some 54 genera and at least 200 species.
Euglena gracilis. A morphological and molecular study of the Euglenozoa put E. gracilis in close kinship with the species Khawkinea quartana, with Peranema trichophorum basal to both, [4] although a later molecular analysis showed that E. gracilis was more closely related to Astasia longa than to certain other species recognized as Euglena.
Paraflagellar rod; Mastigonemes, "hairs" attached to flagellum; Flagellar pocket vestibulum; Feeding apparatus; Paraxial swelling; Eyespot, photoreceptor used to sense light direction and intensity; Contractile vacuole, regulates the quantity of water inside a cell; Ventral flagellum; Ventral root; Golgi apparatus; modifies proteins and sends ...
Unlike the green euglenids, they lack both an eyespot (stigma), and the paraflagellar body (photoreceptor) that is normally coupled with that organelle. [3] However, while Peranema lack a localized photoreceptor, they do possess the light-sensitive protein rhodopsin , and respond to changes in light with a characteristic "curling behaviour."
A flagellum (/ f l ə ˈ dʒ ɛ l əm /; pl.: flagella) (Latin for 'whip' or 'scourge') is a hair-like appendage that protrudes from certain plant and animal sperm cells, from fungal spores (), and from a wide range of microorganisms to provide motility.
Schematic of the eukaryotic flagellum. 1-axoneme, 2-cell membrane, 3-IFT (Intraflagellar transport), 4-Basal body, 5-Cross section of flagellum, 6-Triplets of microtubules of basal body. Longitudinal section through the flagella area in Chlamydomonas reinhardtii. In the cell apex is the basal body that is the anchoring site for a flagellum.