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Amphidinium (am-fee-din-ee-um) latum Lebour 1925. The image shows a cell in ventral view. The red stigma is visible in the sulcal area. The plastids are blue-green and yellow-brown. The epicone is shorter than the hypocone.
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Cells rounded square to oblong from the ventral side, dorso-ventrally flattened. Length 16 - 25 microns, width 13 - 26 microns, length to width ratio 0.8 - 1.8. During ingestion, cell shape distorted, becoming broader and rounder. Epicone cone shaped, with a pointed apex. Cingulum wide, approximately 2 microns, completely encircling the cell. Sulcus narrow, a straight line down the middle of the cell, becoming wider at the antapex, where it forms a notch. Short sulcal extension present on the epicone. Apical groove present, continuing from the sulcal extension to the left of the apex and then in an anticlockwise spiral around the apex. Nucleus in the centre or to the left of the hypocone, rounded. Chloroplasts not present. Different coloured food bodies/kleptochloroplasts present, including bright pale green, brown and blue-green cells. Generally very fast swimming. Non-motile cells rarely observed, round, approximately 22 microns diameter, surrounded by a hyaline layer, cingulum often still recognisable.
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Amphidinium latum, an unsually large cell with green inclusions, observed in marine muds and sandy sediments in the vicinity of Broome, Western Australia in September 2003. This work was supported by the Australian Biological Resources Study.
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Amphidinium latum observed in marine muds and sandy sediments in the vicinity of Broome, Western Australia in September 2003. This work was supported by the Australian Biological Resources Study.
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Amphidinium latum, an unsually large cell with green inclusions, observed in marine muds and sandy sediments in the vicinity of Broome, Western Australia in September 2003. This work was supported by the Australian Biological Resources Study.
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This species (A. poecilochroum?) contains a number of symbiotic blue green algae (identifiable as such from the colour). Many protists contain blue green algae, and this has been used by some to create a taxon for protists with these symbionts, imagining that they represent some kind of intermediary between bacterial and eukaryotic life. The equatorial flagellum can be seen as it curves round the cell, the groove in which the longitudinal flagellum normally resides is evident, although the flagellum is not visible.
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Amphidinium (am-fee-din-ee-um) poecilochroum Larsen 1985. The image shows a cell in ventral view. The epicone is small, the cingulum is near the anterior end of the cell.
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Amphidinium (am-fee-din-ee-um) poecilochroum Larsen 1985. The image shows a mid-focal plane through a cell. The epicone is small, the cingulum is near the anterior end of the cell.
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Amphidinium (am-fee-din-ee-um) poecilochroum Larsen 1985. The image shows a cell in ventral view. The epicone is small, the cingulum is near the anterior end of the cell. This species contains blue green algae.