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Cells oval from the ventral side, dorso-ventrally flattened. Length 26 - 34 microns, width 21 - 30 microns, length to width ratio 1.1 - 1.4. Cells ventrally flat, dorsally ridged into a series of approximately 7 - 8 'ribs' . Epicone small, club shaped, with a groove that begins just above the start of the cingulum and appears to widen into a depression near the apex. Hypocone forms a 'collar' around the epicone on the dorsal side. Cingulum incompletely encircling the epicone, distal end approximately 4 microns higher than proximal. Sulcus shallow and barely visible. Large (2 - 3 microns) pusule present 0.4 - 0.5 of the cell length from the apex, around the mid-line. Longitudinal flagellum originating just below the pusule. Indented around the inside of the periphery of the ventral side, 1 - 2 microns from the rim. Nucleus in the posterior part of the hypocone, oval to crescent shaped, 14 - 11 x 10 - 7 microns. Chloroplasts narrow, yellow-brown, 2 - 4 x 1 - 2 microns, radiating from the centre. Non-motile cells more rounded, with the hypocone encircling the epicone.
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Amphidinium corrugatum observed in marine muds and sandy sediments in the vicinity of Broome, Western Australia in September 2003. This image was taken using differential interference contrast optics. This work was supported by the Australian Biological Resources Study.
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Amphidinium corrugatum, from the dorsal side and showing the corrugations, observed in marine muds and sandy sediments in the vicinity of Broome, Western Australia in September 2003. This image was taken using differential interference contrast optics. This work was supported by the Australian Biological Resources Study.
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Amphidinium corrugatum Larsen et Patterson 1990.
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Amphidinium corrugatum Larsen et Patterson 1990.
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Amphidinium (am-fee-din-ee-um) herdmanii Kofoid & Swezy 1921. The image on the left shows a cell in ventral view. The epicone is small and turned to the left. The plastids are yellow-brown and radiating from the centre. The image on the right shows a mid-focus plane through a cell, showing the circular pyrenoid near the middle of the cell.
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Amphidinium (am-fee-din-ee-um) herdmanii Kofoid & Swezy 1921. The image shows a cell in ventral view. The epicone is small and turned to the left. The plastids are yellow-brown and radiating from the centre. The hyaline area in the posterior of the cell is the nucleus.
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Amphidinium (am-fee-din-ee-um) herdmanii Kofoid & Swezy 1921. The image shows a cell in ventral view (side-reversed ). The epicone is small and turned to the left. The plastids are radiating from the centre.
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Cells rounded oblong to oval from the ventral side, dorso-ventrally flattened. Length 20 - 31 microns, width 15 - 25 microns, breadth (lateral) approximately 10 microns, length to width ratio 1.2 - 1.5. Epicone large triangle from the ventral side, 8 - 13 microns wide at its widest, slightly deflected to the left. From the dorsal side epicone symmetrical, protruding over the hypocone, apically flat or with the sides sloping down away from the apex. Short (3 - 4 microns) groove begins just above the proximal end of the cingulum, leading towards the apex. Cingulum beginning approximately 0.3 of the cell length from the apex, ascending initially, continuing in a straight path across the dorsal side then descending on the ventral side, distal end slightly higher than proximal. Large (2 - 3 microns) pusule present, just to the right of the start of the sulcus, smaller pusule, difficult to observe, just below the proximal end of the cingulum. Longitudinal flagellum originating in pocket below the proximal end of the cingulum. Sulcus beginning below the proximal end of the cingulum, initially narrow then widening towards its posterior end, left side much more distinct than right. Hypocone slightly asymmetrical, with the left side longer than the right, in high focus appearing indented at the antapex by the sulcus. Nucleus in the posterior part of the hypocone, crescent shaped, 11 - 17 x 3 - 7 microns. Chloroplast single, radiating from the centre. Round pyrenoid-like structure, 5 - 6 microns diameter, sometimes apparent in the centre. Small lipid globules and reddish bodies, possibly food particles, occasionally present.
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Amphidinium herdmanii observed in marine muds and sandy sediments in the vicinity of Broome, Western Australia in September 2003. This image was taken using differential interference contrast optics. This work was supported by the Australian Biological Resources Study.
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Amphidinium herdmanii observed in marine muds and sandy sediments in the vicinity of Broome, Western Australia in September 2003. This image was taken using differential interference contrast optics. This work was supported by the Australian Biological Resources Study.
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Amphidinium herdmanii, showing its pyrenoid, observed in marine muds and sandy sediments in the vicinity of Broome, Western Australia in September 2003. This image was taken using differential interference contrast optics. This work was supported by the Australian Biological Resources Study.
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Amphidinium (am-fee-din-ee-um) incoloratum Campbell1973. The image shows a cell in ventral view. The epicone is small and turned to the left. The cell is colourless (contains no plastids). The large nucleus is in the middle of the left cell side.
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Cells broadly oval to egg-shaped, with a relatively straight left side and a convex right side, dorso-ventrally flattened. Length 24 - 38 microns, width 17 - 24 microns, length to width ratio 1.3 - 1.6. Epicone 5 - 10 microns at its widest, deflected to the left. Cingulum becoming relatively deep and wide (approximately 2 microns), distal end approximately 4 microns lower than proximal. Transverse flagellum originating in a pocket just below the proximal end of the cingulum. Narrow ventral ridge beginning just to the right of the origin of the cingulum, contininuing down the cell in a straight path, past the distal end of the cingulum to the origin of the sulcus. Sulcus beginning 0.6 - 0.7 of the cell length from the apex, to the left of the mid-ventral line, initially narrow, the left side broadening posteriorly, the right side continuing in a straight line to the posterior end. Longitudinal flagellum arising in a pocket just before the anterior end of the sulcus, approximately 60 microns. Two pusules present, a large (approximately 2 microns diameter) obvious one to the right of the anterior end of the sulcus, and a smaller, less distinct one just below the origin of the cingulum. Apical groove not present. Nucleus in the posterior part of the hypocone, round, 10 -14 microns diameter. Chloroplasts not present. Cytoplasm filled with large colourless lipid globules and occasionally food particles. Non-motile cells round, approximately 45 microns diameter, surrounded by a hyaline layer, showing no detail of cingulum or sulcus.
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Amphidinium incoloratum observed in marine muds and sandy sediments in the vicinity of Broome, Western Australia in September 2003. This image was taken using differential interference contrast optics. This work was supported by the Australian Biological Resources Study.
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Amphidinium incoloratum Campbell 1973.
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Amphidinium incoloratum Campbell 1973. Just divided cell, daughter cells still connected to each other.
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Amphidinium incoloratum Campbell 1973.
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Amphidinium (am-fee-din-ee-um) operculatum, an autotrophic dinoflagellate, girdle located very close to anterior pole of cell such that the epicone is a small protrusion. The plastid, pyrenoid and flagella are evident. Differential interference microscopy.
data on this strain.
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Amphidinium (am-fee-din-ee-um) operculatum, an autotrophic dinoflagellate, girdle located very close to anterior pole of cell such that the epicone is a small protrusion. The plastid, pyrenoid and flagella are evident. Differential interference microscopy.
data on this strain.
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Amphidinium (am-fee-din-ee-um) operculatum Claparede & Lachmann 1858. The images show cells in ventral view. The epicone is small and turned to the left. Many yellow-brown plastids are present. The lighter area at the posterior of the cell is the nucleus.
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Amphidinium (am-fee-din-ee-um) operculatum Claparede & Lachmann 1858. The image shows a cell in ventral view. The epicone is small and turned to the left. Many yellow-brown plastids are present. The lighter area at the posterior of the cell is the nucleus.
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Amphidinium (am-fee-din-ee-um) operculatum Claparede & Lachmann 1858. The image shows a non-motile stage (temporary cyst) in ventral view. The cell is surrounded by a hyaline layer. Yellow brown plastids are present.