Diatoms – SAR-Stramenopiles (Bacillariophyta)

Observations on Nitzschia sigmoidea

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Nitzschia sigmoidea (Nitzsch) W.Smith 1853

Most likely ID: n.a.

Basionym: Bacillaria sigmoidea Nitzsch 1817

Add’l Synonyms: Cymbella sigmoidea (Nitzsch) C.Agardh 1830
                   Navicula sigmoidea (Nitzsch) Ehrenberg 1831
                         Synedra sigmoidea (Nitzsch) Kützing 1844
                         Frustulia sigmoidea (Nitzsch) Jenner 1845
                         Nitzschia elongata Hassal 1845
                         Homoeocladia sigmoidea (Nitzsch) Elmore 1921
                         Nitzschia sigmoidea var. genuina Cleve-Euler 1952

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Sampling date 10/2011.

Three images, girdelband (cingular) views.

First:	Complete specimen. Scale bar indicates 100 µm.
Second:	Detail: Apex in cingular view, displaying cingulum (central strae and the two canal raphes on the edges. Scale bar indicates 25 µm.
Third:	Detail: Center of the cell in cingular view with nucleus, cloroplasts with oil droplets (energy store) and the canal raphes. Scale bar indicates 25 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: Pond Suploch, Hiddensee (Germany)
Latitude: 54.538638 Longitude: 13.097802

Microscope Zeiss Universal, camera Olympus C7070WZ. DOF images.

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Sampling date 10/2007. Scale bars indicate 100 µm (1, 2) and 10 µm (3, 4).

Four images, girdelband (cingular) views.

First:	Nitzschia sigmoidea with a very straight cell. The enlargements in the image show the overlap of epitheca and hypotheca, the girdle and the keel arches of the fibula-raphe system and a Chlamydomonas-like green flagellate.
Second:	The enlargement in the image shows the keel arcs of the fibulate raphe system and the nucleus with nucleolus and the chromatine structure typical for diatom nuclei.
Third:	Zoom on the nucleus of Nitzschia with nucleolus and the chromatine structure typical for diatom nuclei.
Fourth:	Zoom on keel arcs of Nitzschias special fibulate raphe system. It´s a cingular view with girdle bands in the middle.

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: Pond Suploch, Hiddensee (Germany)
Latitude: 54.538638 Longitude: 13.097802

Microscope Zeiss Universal, camera Olympus C7070WZ. DOF images.

Place name: Pond Domänental near Kronshagen (Kiel, Germany)
Latitude: 54.33211 Longitude: 10.060821

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

© 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 Nitzschia sigmoidea

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