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Gyrodinium oblongum 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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Gyrodinium oblongum, 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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Gyrodinium oblongum cells are oblong from the ventral side, dorso-ventrally flattened posteriorly, length 17 - 25 microns, width 6-10 microns. The epicone and hypocone are approximately equal in size. Cingulum displaced approximately 1/4 - 1/3 of cell length. The sulcus initially narrow but widens at the posterior end . Apical groove not present. Nucleus in the hypocone, approximately 5 microns diameter . Chloroplast single, yellow-brown, forms thin longitudinal strands towards the anterior and posterior ends. Obvious pyrenoid present, 3 - 4 microns diameter, in the centre of the cell.
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Cells are spindle shaped and asymmetric. The cingulum is narrow and excavated and displaced by more than one third of the body length. The apex is pointed. The antapical part of the cell is slightly bilobed. Chloroplasts are absent but food vacuoles are somteimes visible.
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Katodinium (cat-owe-din-ee-um) common coastal marine dinoflagellate. The cingulum (circumferential groove) is located near the posterior of the body so that the epicone (front part) is much bigger than the epicone (back part). This genus is in part distinguished by the groove near the apex of the epicone. This individual is clearly a carnivore. With longitudinal flagellum trailing behind the cell. Phase contrast.
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Katodinium spec.
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Katodinium (cat-o-din-ee-um) asymmetricum (Massart) Loeblich III 1965. The image shows a mid-focus plane through a cell (side reversed). The epicone is longer than the hypocone, and the cingulum is near the posterior end of the cell. There is an apical hook present. pointing to the left.
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Katodinium asymmetricum 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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Katodinium asymmetricum cells are ovoid from the ventral side, slightly obliquely dorso-ventrally flattened, approximately 12 microns long, epicone approximately 10 microns wide, hypocone approximately 5 microns wide. Possessing fine thecal plates, plate pattern not established. Epicone dome shaped, 0.6 0.7 of the total cell length, with a notch just to the left of the apex. Cingulum very wide, initially descending, and slightly displaced. Sulcus narrow, on the right side of the hypocone, and turning to the left as it descends towards the anterior end. Longitudinal flagellum arises at the anterior end of the sulcus. Nucleus is in the left half of the cell, about 4 microns diameter. Chloroplasts absent. Food particles occasionally present.
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Katodinium asymmetricum (Massert) Loeblich III 1965
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Katodinium asymmetricum (Massert) Loeblich III 1965
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Katodinium auratum cells are elongated oval from the dorsal side, slightly dorso-ventrally flattened. Length 19 30 microns, width 9 15 microns. Cingulum beginning at 0.5 0.6 of the way down the cell, 2 3 microns wide, distal end 2 3 microns lower than proximal. Sulcus initially narrow, approximately 1.5 microns, widening towards the posterior of the cell. Apical groove not present. Longitudinal flagellum arising at the anterior end of the sulcus. Nucleus in the epicone, just above the cingulum, round, 6 -10 x 7 10 microns. Chloroplasts yellow-green, round to oval, 4 6 x 2 3 microns. Chloroplasts generally positioned peripherally, 10 20 per cell. A red stigma, 2 4 microns, is present at the origin of the sulcus. Colourless globules are also present in the anterior end of the epicone.
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Polykrikos (polly-cry-coz) lebourae Herdman 1923. The image shows a cell in right lateral view. The cell has many cingula. The cell contains no plastids, however a food particle is present.
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Polykrikos (polly-cry-coz) lebourae Herdman 1923. The image shows a cell in lateral view. The cell has many cingula. There are two nuclei present, one in the posterior of the cell, the other near the anterior end.
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Polykrikos (polly-cry-coz) lebourae Herdman 1923. The image shows a cell in right lateral view. The cell has many cingula.
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Polykrikos lebourae Herdman 1923
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Polykrikos lebourae Herdman 1923
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Polykrikos lebourae Herdman 1923
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Polykrikos lebourae Herdman 1923
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Dorso-lateral view of the numerous transverse flagella lie in the cingular grooves of this phagotrophic gymnodinioid dinoflagellate. Isolated by Bob Moore from Little Sippiwissett marsh near Woods Hole, Massachusetts, USA. Differential interference contrast optics.
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Differential interference contrast image of this phagotrophic dinoflagellate isolated from Chappaquoit beach, Massachusetts. The brown inclusions are partly digested elements from food - this species was observed consuming other dinoflagellates. This species may have more than one nucleus, but in this cell there is a singler nucleus (middle of right hand side of cell). There are also large extrusomes within the cell. Image by all.
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This guys can be real quick. With so many flagella, one would expect so... Bugs isolated by Bob Moore, identified by Shauna Murray, video by Dan Lahr.
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A bunch of Polykrikos lebourae moving around. These guys were isolated and picked using a "very hi-tech and complex technique" developed by Bob Moore and Shauna Murray. Video by Dan Lahr.
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Akashiwo (ah-cash-ww-woe) sanguinea (previously Gymnodinium sanguinea) has an equatorial flagellum lying in a groove (girdle or cingulum) near the centre of the cell and a second flagellum trailing behind the cell and arising in a longitudinal groove or sulcus. This species is flattened, and has plastids. Phase contrast microscopy.
data on this strain.