Diatoms – SAR-Stramenopiles (Bacillariophyta)

Observations on Cocconeis placentula var. euglypta

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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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