Extended Observation Descriptions

Amoeboid Protists
Naked Amoebae
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- Saccamoeba limax
Testate Amoebae
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- Pyxidicula operculata
Heliozoic Amoebae
Algae
- non-flagellous -
Chlorophyta
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- Chlorella spec.
- Eremosphaera viridis
Streptophyta (Desmidiaceae)
Ciliates
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Prostomatea
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OIigohymenophorea
Diatoms
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Coscinodiscophyceae
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- Melosira lineata
METAZOA
Cnidaria
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- Hydra viridissima
Rotifera
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- Ptygura kostei
- Ptygura longicornis

Extended Observation Description on Ptygura longicornis

Ptygura longicornis (Davis, 1867)

Taxonomic description in the Encyclopedia of Life

Link to the corresponding entry in Protisten.de

Ptygura longicornis in a Freshwater Aquarium

Ptygura longicornis on Java moss (Taxiphyllum barbieri) filaments from a freshwater aquarium.

On the Java moss filaments, Ptygura longicornis was found attached to its axils.

Fig. 1: Ptygura longicornis on a Java moss (Taxiphyllum barbieri) filament. Mucilaginous sheath (arrow), corona (double arrowhead), lateral (ventral) antennae (arrowhead), showing clearly one of the numerous and very long setae attached to the tip (piston) of an antenna (double headed arrow). Scale bar indicates 100 µm.

Fig. 2: Ptygura longicornis showing rotating corona (left) and the animal half retracted into its sheath (right), the antennae are already extended.
Scale bar indicates 100 µm.

Sessile rotifers only have eyespots in the volatile non-sedentary stage. When they have attached themselves firmly to the substrate and built their mucilaginous sheath, the no longer needed eyespots degenerate. The animal shown in Fig. 1 and 2 had not been attached for long, it still had one eyespot.

Fig. 3: Fully unfolded corona (double arrowhead), one remaining eyespot, both lateral/ventral antennae (arrowhead) are visible, the lower one is very much shortened in perspective, while the upper one is almost perpendicular to the direction of photography. Many setae are shown in optical section (double headed arrow), also the piston (arrow), showing that the setae also run inside the antennae. Although the setae are significantly longer than the retracted body, they are fully retractable! They are likely to be coiled up in the body when retracted.
Scale bar indicates 50 µm.

Fig. 4: Optical tomographic sections. Folded corona (double headed arrow) in left image. In the right image, the corona is fully opened, but the body is not yet fully extended, which becomes visible through the folded integument (double headed arrow). The arrow points to the mucilaginous sheath with enclosed detritus.

© Wolfgang Bettighofer,
images under Creative Commons License V 3.0 (CC BY-NC-SA).
For permission to use of (high resolution) images please contact postmaster@protisten.de.

Protisten.de

Extended Observation Description on Ptygura longicornis

Ptygura longicornis in a Freshwater Aquarium

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