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Size [µm]
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Females about 1000
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Characteristics
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Ventral valve rim straight, with mucro. Large compound eye, point-like nauplius eye.
Prominent front cornet might be absent. Antennula little and inflexible.
Antennae with 9 bristles. Light to dark brown. Often circling around underneath the water surface.
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Habitate
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Grazing the hyponeuston of still waters.
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To see images, please click on thumbnails below.
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Images
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Midsummer female.
Note a number of parthenogenetic eggs.
Note the straight ventral valve rim.
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Front view of the above individual.
Note two adhering ciliates in the lower valve region.
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Female individual caught by a heliozoon.
The specimen could free himself after having been caught for 3 hours.
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Individual from above after having escaped.
Note, that there is a piece of heliozoan cytoplasm still adhering to the right mucro tip.
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General informations from: H Streble and D Krauter: Das Leben im Wassertropfen. 8th edition,
Frankh-Kosmos Verlag, Stuttgart 1988
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