Diatoms – SAR-Stramenopiles (Bacillariophyta)

Observations on Cocconeis placentula var. euglypta

Protisten / Protisten.de – created by Wolfgang Bettighofer / Bacillariophyta / Bacillariophyceae / Cocconeis placentula var. euglypta

Position in the EOL taxonomic tree. Please click on the tree view below to access EOL (Encyclopedia of Life).

Cocconeis placentula var. euglypta (Ehrenberg) Cleve 1895

Most likely ID: n.a.

Basionym: Cocconeis euglypta Ehrenberg 1854

Add’l Synonyms: Cyclotella lineata var. euglypta Gutwinski 1895

Scale bars indicate 25 µm.

Two images.

First:	Upper valve (epivalve) without raphe.
Second:	Lower valve (hypovalve) with raphe that allows a slow change of position.

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.

Scale bars indicate 25 µm.

Three images. Two states of sexual reproduction generating auxospores.

First:	Early state (arrow).
Second:	Later phase of another couple (arrow). The epivalvae are opened, the cell plasmas have united. Optical cross section, the focal plane is near the hypovalvae.
Third:	Same phase. The focal plane is higher, the epivalve become visible.

UV = upper valve, LV = lower valve.

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.

Scale bars indicate 25 µm.

Three optical cross-sections through a fully developed auxospore.

First:	Top view showing chloroplasts.
Second and third:	The nucleus is visible.
Fouth:	The focal plane is on the hypovalve.

Chl = chloroplast, N = nucleus, UV = upper valve, LV = lower valve.

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.

Four images.
Sampling and preparation for the LM by Hermann Hochmeier, Wilhelmsburg.

First:	Hypovalve with raphe. Scale bar indicates 5 µm.
Second:	Detail. Scale bar indicates 1 µm.
Third:	Epivalve without raphe. Scale bar indicates 10 µm.
Fourth:	Detail. Scale bar indicates 2 µm.

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: Danube loop near Schloegen (Austria)
Latitude: 48.435609 Longitude: 13.865757 Elevation: 276 m

Tescan Clara SEM, Tescan Clara SEM, © Wolfgang Bettighofer/Jürgen Stampfl

© 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 Cocconeis placentula var. euglypta

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