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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.
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. [1] [2] Species of Euglena are found in fresh water and salt water.
The stigma is located laterally, in a fixed plane relative to the cilia, but not directly adjacent to the basal bodies. [42] [43] The fixed position is ensured by the attachment of the chloroplast to one of the ciliary roots. [44] The pigmented stigma is not to be confused with the photoreceptor.
Megan Davidhizar received two rubber ducks from her students during her first year teaching high school freshmen 16 years ago. She displayed them on her desk and other students saw the ducks and ...
They are insufficient for vision, as they cannot distinguish shapes or determine the direction light is coming from. Eyespots are found in nearly all major animal groups, and are common among unicellular organisms, including euglena. The euglena's eyespot, called a stigma, is located at its anterior end. It is a small splotch of red pigment ...
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The stigma is located laterally, in a fixed plane relative to the cilia, but not directly adjacent to the basal bodies. [62] [63] The fixed position is ensured by the attachment of the chloroplast to one of the ciliary roots. [64] The pigmented stigma is not to be confused with the photoreceptor.