Metazoa – Obazoa (Opisthokonta)

Observations on Hydra viridissima

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Hydra viridissima Pallas, 1766

Most likely ID: n.a.

Basionym: n.a.

Add’l Synonyms: NM

Scale bars indicate 1 mm (1), 250 µm (2, 3, 5), 100 µm (4).

Five images.

Please click on < or > on the image edges or on the dots at the bottom edge of the images to browse through the slides!

Place name: Tropical freshwater aquarium
Latitude: 54.3018013 Longitude: 10.07120132

a) Olympus stereo microscope SZX16/Planapo 2.0x, camera Olympus OM-D M5 MKII. Some DOF images.

b) Fifth image:
Microscope Zeiss Axioplan, camera Olympus OM-D M5 MKII. DOF image.

Scale bars indicate 250 µm (1, 2), 25 µm (3-6), 10 µm (7, 8).

Four image couples, some with and without marking arrows.

First couple:	Penetrant nematocysts (arrow), ejected sticky thread of a gultinant ptychocyst (double headed arrow).
Second couple:	Optical cross section through a tentacle.
Third couple:	The optical cross section through the body shows all three types of their cnidae: some penetrant nematocysts (arrow) showing shaft and coiled hollow tubule for transportation of the toxin into the prey, some more volvent spirocyst (arrowhead) and one glutinous ptychocysts (double headed arrow).
Fourth couple:	Nucleus of a zoochlorella (arrow), glutinous ptychocyst for attaching the animal to a surface (double headed arrow).

Please click on < or > on the image edges or on the dots at the bottom edge of the images to browse through the slides!

Place name: Tropical freshwater aquarium
Latitude: 54.3018013 Longitude: 10.07120132

Microscope Zeiss Axioplan, camera Olympus OM-D M5 MKII. DOF images.

© 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.

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Observations on Hydra viridissima

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