Petalomonadida

Notosolenus (note-owe-so-lean-us) ostium Larsen and Patterson, 1990. Cells are 18 - 65 microns long and have a small ingestion organelle, which is obliquely oriented and visible on the ventral face of the cell. The cells have a longitudinal dorsal groove and are slightly concave on the ventral face. The cells are with dorsally a median longitudinal groove, and ventrally a wide groove and four fine stripes. Two flagella emerge from the flagellar canal and are in unequal length. The anterior flagellum is about 1 - 1.5 times the length of the cell and the posterior flagellum is about 0.2 to 0.6 times the length of the cell. The organism contained eukaryotic algal food up to 8 microns long. The reservoir is anteriorly situated in the right side of the cell and the nucleus in the left side. Common in late cultures.

Notosolenus ostium Larsen and Patterson, 1990. Cells are 18 - 65 microns long and have a small ingestion organelle, which is obliquely oriented and visible on the ventral face of the cell. The cells have a longitudinal dorsal groove and are slightly concave on the ventral face which has a wide groove and four fine stripes. Two flagella emerge from the flagellar canal and are in unequal length. The anterior flagellum is about 1 - 1.5 times the length of the cell and the posterior flagellum is about 0.2 to 0.6 times the length of the cell. The reservoir is near the front in the right side of the cell and the nucleus is to the left.

Notosolenus ostium. Cell feeding on the plastid of a diatom - observed in sandy and muddy marine sediments in the vicinity of Broome, Western Australia in September 2003. This image was taken using phase contrast optics.   This work was supported by the Australian Biological Resources Study.

Notosolenus ostium. Cell observed in sandy and muddy marine sediments in the vicinity of Broome, Western Australia in September 2003. This image was taken using phase contrast optics.   This work was supported by the Australian Biological Resources Study.

Notosolenus ostium. Image of cell observed in sandy and muddy marine sediments in the vicinity of Broome, Western Australia in September 2003 showing the short recurrent flagellum. This image was taken using phase contrast optics.   This work was supported by the Australian Biological Resources Study.

Notosolenus chelonides Skuja, 1939. Cells rigid, oval or broadly egg-shaped, flattened. The cells are 27-35 x 19-28 microns and 10-14 microns thick. Dorsal side strongly convex with 3-4 very strong, high longitudinal keels, which converge forward. Ventral side flat and concave, with an twisted longitudinal furrow. Anterior flagellum approximately cell length and posterior flagellum 0.5-0.6 times cell length. Cytoplasm hyaline, with rather large, round paramylon granules. Large nucleus in left-central part of the cell.

Notosolenus esulcis Larsen, 1987. Cell pear-shaped, about 17 microns long, about 10 microns wide, flattened, with four shallow, longitudinal ridges on the dorsal side. Anterior flagellum about the length of the cell and recurrent flagellum about 0.75 times of the cell length. Reservoir anterior right, and small. Nucleus situated in the central part of the cell.

Notosolenus (note-owe-so-lean-us) a heterotrophic euglenid flagellate. The cells are rigid, the surface is ridged, and the cell has one well developed flagellum projecting from the front and a second, usually short, flagellum trailing under the moving cells (the second flagellum is not visible in this micrograph). Phase contrast. Material from Nymph Creek and Nymph Lake, thermal sites within Yellowstone National Park, photograph by Kathy Sheehan and David Patterson.

Notosolenus (note-owe-so-lean-us) apocamptus Stokes, 1884. Cells are oval or ovate, 6 to 12 microns long (mostly 8 to 11 microns), 4 to 7 microns wide, about 2 microns thick, and flattened. The anterior end of the cell is slightly narrowed and the posterior end is roundish. A deep longitudinal dorsal groove runs along the entire cell. Both sides of the groove are slightly rounded. Two flagella of unequal length emerge from an ovate reservoir in the right hand side of the cell. The anterior flagellum is approximately 1.5 to 1.8 times cell length and the posterior flagellum is approximately 0.4 to 0.6 times cell length. The nucleus is located on the left of the cell. The cells move by smooth gliding with anterior flagellum extended. Common.

Notosolenus apocamptus (Stokes, 1884) Stokes, 1884. Cells are oval or ovate, 6 to 12 microns long (mostly 8 to 11 microns), 4 to 7 microns wide, about 2 microns thick, and flattened. The anterior end of the cell is slightly narrowed and the posterior end is roundish. A deep longitudinal dorsal groove runs along the entire cell. Both sides of the groove are slightly rounded. Two flagella of unequal length emerge from an ovate reservoir in the right hand side of the cell. The anterior flagellum is approximately 1.5 to 1.8 times cell length and the posterior flagellum is approximately 0.4 to 0.6 times cell length. The nucleus is located on the left of the cell. The cells move by smooth gliding with anterior flagellum extended.

Notosolenus apocamptus. Cell observed in sandy and muddy marine 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.

Notosolenus canellatus Skuja, 1948. Gliding euglenid, measuring 15-18 microns long, anterior flagellum about 1.5 times cell length, posterior flagellum about cell length. Anterior end with small but obvious collar, posterior end slightly pointed, dorsal face with one median and two lateral grooves but basically convex. Edges of the cell, especially at the posterior end, are thin flanges. Ventrally flattened, occasionally with one fine median ventral groove which could easily be overlooked.

Notosolenus (note-owe-so-lean-us) similis Skuja, 1939. Cell outline is oblong. Cells are 10 to 22 microns long (mostly 12 to 17 microns), 6 to 12 microns wide, and flattened. The cells are usually with a narrowed anterior end and a rounded posterior end. The right half of the cell is thicker than the left half. The organism has a dorsal groove in the left-hand side of the cell with a well developed undulating ridge and may or not have a shallow median ventral groove. The two flagella are unequal in length, the anterior flagellum is about 1.0 to 1.7 times cell length and the recurrent posterior flagellum is about 0.3 to 0.5 times cell length. The reservoir lies in the right side of the cell, is usually roundish and the nucleus is in the left side. The cells glide with the anterior flagellum in contact with the substrate. Common, especially after cover slips have been in place for several days.

Notosolenus (note-owe-so-lean-us) similis Skuja, 1939. Cell outline is oblong. Cells are 10 to 22 microns long (mostly 12 to 17 microns), 6 to 12 microns wide, and flattened. The cells are usually with a narrowed anterior end and a rounded posterior end. The right half of the cell is thicker than the left half. The organism has a dorsal groove in the left-hand side of the cell with a well developed undulating ridge and may or not have a shallow median ventral groove. The two flagella are unequal in length, the anterior flagellum is about 1.0 to 1.7 times cell length and the recurrent posterior flagellum is about 0.3 to 0.5 times cell length. The reservoir lies in the right side of the cell, is usually roundish and the nucleus is in the left side. The cells glide with the anterior flagellum in contact with the substrate. Common, especially after cover slips have been in place for several days.

Notosolenus similis Skuja, 1939. Cell outline is oblong. Cells are 10 to 22 microns long (mostly 12 to 17 microns), 6 to 12 microns wide, and flattened. The cells are usually with a narrowed anterior end and a rounded posterior end. The right half of the cell is thicker than the left half. The organism has a dorsal groove in the left-hand side of the cell with a well developed undulating ridge and may or not have a shallow median ventral groove. The two flagella are unequal in length, the anterior flagellum is about 1.0 to 1.7 times cell length and the recurrent posterior flagellum is about 0.3 to 0.5 times cell length. The reservoir lies in the right side of the cell, is usually roundish and the nucleus is in the left side. The cells glide with the anterior flagellum in contact with the substrate.

Notosolenus (note-owe-so-lean-us) urceolatus Larsen and Patterson, 1990. Cell outline is posteriorly broad and anteriorly narrow with a small neck around the flagellar canal. The cells are 8 to 17 microns (mostly 13 to 15 microns) and 7 to 11 microns wide. This species has three dorsal keels, two lateral ridges and three fine ventral ridges. The right and left ventral ridges extend from the flagellar canal. The left one curves slightly from the anterior to the posterior and in some cells it forms an arc. The median ridge extends from the small protrusion near the anterior end of the cell. This species has an asymmetric posterior end with a small protrusion. With two flagella of unequal length, the anterior flagellum is slightly longer than the cell, and the posterior flagellum about 0.6 to 0.8 times cell length, is recurrent and inserts to the left of the ventral protrusion in the neck. The reservoir lies in the right hand side of the cell and the nucleus in the left. The cells glide slowly with the anterior flagellum directed anteriorly. Common.

Notosolenus (note-owe-so-lean-us) urceolatus Larsen and Patterson, 1990. Cell outline is posteriorly broad and anteriorly narrow with a small neck around the flagellar canal. The cells are 8 to 17 microns (mostly 13 to 15 microns) and 7 to 11 microns wide. This species has three dorsal keels, two lateral ridges and three fine ventral ridges. The right and left ventral ridges extend from the flagellar canal. The left one curves slightly from the anterior to the posterior and in some cells it forms an arc. The median ridge extends from the small protrusion near the anterior end of the cell. This species has an asymmetric posterior end with a small protrusion. With two flagella of unequal length, the anterior flagellum is slightly longer than the cell, and the posterior flagellum about 0.6 to 0.8 times cell length, is recurrent and inserts to the left of the ventral protrusion in the neck. The reservoir lies in the right hand side of the cell and the nucleus in the left. The cells glide slowly with the anterior flagellum directed anteriorly. Common.

Notosolenus urceolatus Larsen and Patterson, 1990. Cell outline is posteriorly broad and anteriorly narrow with a small neck around the flagellar canal. The cells are 8 to 17 microns (mostly 13 to 15 microns) and 7 to 11 microns wide. This species has three dorsal keels, two lateral ridges and three fine ventral ridges. The right and left ventral ridges extend from the flagellar canal. The left one curves slightly from the anterior to the posterior and in some cells it forms an arc. The median ridge extends from the small protrusion near the anterior end of the cell. This species has an asymmetric posterior end with a small protrusion. With two flagella of unequal length, the anterior flagellum is slightly longer than the cell, and the posterior flagellum about 0.6 to 0.8 times cell length, is recurrent and inserts to the left of the ventral protrusion in the neck. The reservoir lies in the right hand side of the cell and the nucleus in the left. The cells glide slowly with the anterior flagellum directed anteriorly.

Notosolenus urceolatus. Cell observed in sandy and muddy marine 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.

Notosolenus lagenos Skuja, 1948. Cells relatively large, 40-46 x 23-28 microns, 12-17 microns thick and very weakly metabolic, flattened, elliptical-egg-shaped, in the front tapers with a neck, in the back rounded off. Dorsal side strongly convex. Anterior flagellum about 1-1.3 times cell length, posterior flagellum very short (1/7 - 1/9 times cell length). Reservoir oblong pear-shaped. Cell surface smooth and hyaline. Cytoplasm filled with medium sized spherical paramylon grains. Nucleus behind the centre of the cell.

Notosolenus papilio Skuja, 1939. Gliding rigid euglenid, cell broadly rhomboid with one mid-ventral groove, sometimes almost butterfly-shaped, dorso-ventrally flattened. The anterior end of cell has a short neck and is slightly flared. Cells are 10 - 16 microns long. The anterior flagellum is about the same length as the cell, the second flagellum arises from the anterior end of the cell and is 0.75 - 1.3 CL. The lateral margins of cell have an undulating profile or are convex or more rarely slightly concave. The posterior end of the cell is slightly pointed. The dorsal side of the cell is convex with 4 ridges and the ventral side of the cell is concave with a shallow wide groove. The ventral groove and the dorsal ridges are often not well developed and so hard to see. The pellicle is quite thick. Frequently, detritus adheres to cells. An oval nucleus is located on the left hand side of cell and the flagellar-pocket on the right hand of cell. The contractile vacuole is situated subapically near the anterior-posterior axis of the cell.