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Set 1, Slide 75, Wet Mount, Lightfield
Protists Linked Set

Protists

 

Euglena Collage 40xEuglena are protists, usually with chloroplasts, found in most nutrient laden fresh water. In this sample, euglena are stained different colors. Even at 100x, they are tiny. They are oval or cylinder-shaped with a single flagellum, but are not considered flagellates. One euglena in this slide has a black dot, or stigma, on it. The stigma functions as an eyespot.

Euglena DiagramWikipedia provides an instructional diagram of an euglena.

Biggest Euglena

The biggest euglena in the sample slide has a stigma. Even though this one is the largest, a flagellum is not visible. It has been stained green and is slightly white near its stigma.

Image Data Description
Big Euglena 400x
400x
Under light field lighting, basic internal texture is visible.
Big Euglena 400x
400x
Under possibly-improperly-used phase contrast, slighly different details are visible, some internal organs and a more pronounced outer layer.

Difference in Shape

There are several different shapes of euglena in the sample slide: circular, oval, ellipse, and cylindrical.

Image Data Description
Strangely Shaped  Euglena 400x
400x
This view shows some stained a reddish hue. Some of these, the red, in particular, have more definitive "white spots" visible within. This shot also shows some of the variety of shapes available: round, oval, pear-ish. The green one in the lower right has a reasonably visible nucleus.
Strangely Shaped  Euglena 400x
400x
Another long cylindrical green one sporting a dark spot. A round red one is also visible clearly showing a darker spot on the top, most likely it's nucleus.

Internal Organs

Some euglena show internal organs. Even at 1000x with oil, these are not all that distinct or clear.

Image Data Description
Euglena Internal Organs 1000x
1000x
This red one, sporting, roughly, the shape of a wrapped Egyptian mummy clearly shows the internal white spots and its nucleus. It's a little bit reminiscent of the course ground texture of thurminger sausage. Just saying...
Euglena Internal Organs 1000x
1000x
A different angle on another red one. This one reveals several white bubbles that could be vacuoles.
Euglena Internal Organs 1000x
1000x
This green euglena shows a distinct structure toward the middle of its body, likely a nucleus.
Euglena Internal Organs 1000x
1000x
Here he is again, but cropped and zoomed to show just the protist. I may be imagining things here, but does that look as if the nucleus is undergoing subdivision?
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