Diatoms – SAR-Stramenopiles (Bacillariophyta)

Observations on Melosira inflexa

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

Melosira inflexa (Roth) Guiry 2019

Most likely ID: n.a.

Basionym: Conferva inflexa Roth 1797

Add’l Synonyms: Conferva moniliformis O.F.Müller 1783
                       Melosira varians var. moniliformis (O.F.Müller) Playfair ?
                       Melosira moniliformis (O.F.Müller) C.Agardh 1824
                       Melosira borreri Greville 1833
                       Melosira borreri var. moniliformis (O.F.Müller) Grunow 1878

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Sampling date 04/2011 and 04/2017. Scale bars indicate 100 µm (1), 50 µm (2, 3), 25 µm (4), 100 µm (5).

Five images, two in a slide changer.

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Place name: North Sea around Heligoland
Latitude: 54.186311 Longitude: 7.895034

Microscope Zeiss Universal, camera Olympus C7070WZ. DOF images.

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Sampling date 10/2018. Scale bars indicate 50 µm (1), 25 µm (2).

Two images

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Place name: Hiddensee Bodden (Germany)
Latitude: 54.582633 Longitude: 13.115051

Microscope Zeiss Universal, camera Olympus Sampling date 10/2018.. DOF images.

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Two images.

Sampling date 10/2018.

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Place name: Hiddensee Bodden (Germany)
Latitude: 54.582633 Longitude: 13.115051

Microscope Zeiss Universal, camera Olympus Sampling date 10/2018.. DOF images.

Sampling date 1/2022.

Place name: Baltic Sea, Kieler Förde, Kiel Fjord (Germany)
Latitude: 54.3894126 Longitude: 10.1749055

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

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Four images. Girdleband view.

Sampling date 1/2022.

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Place name: Baltic Sea, Kieler Förde, Kiel Fjord (Germany)
Latitude: 54.3894126 Longitude: 10.1749055

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

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The sexual reproduction of centric diatoms (Centrales) is characterized by oogamy. In Melosira, the spermatozoids are formed in narrower, the oogonia in broader filaments. After meiosis, four mobile spermatozoa with one flagellum develop in the male gamete mother cells (antheridia), in each of the oogonia three meiotic nuclei collaps and only one egg cell capable of fertilization remains.

The images show the flagella and a golden brown chloroplast (color due to the accessory dye fucoxanthin) at the posterior end of the spermatozoids.

After Krammer, K. and van den Hoek, C.

Sampling date 1/2022.

11 images, five pairs of images, each with and without reference arrows.

First couple:	Three spermatozoids (arrowhead) in the transparent cells in the upper right corner.
Second couple:	The flagellum (arrow) becomes visible.
Third to fifth couple:	The arrow points to the flagellum, the double arrowhead to the golden brown chloroplast.
11. image:	A spermatozoid is leaving the mother cell.

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Place name: Baltic Sea, Kieler Förde, Kiel Fjord (Germany)
Latitude: 54.3894126 Longitude: 10.1749055

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 Melosira inflexa

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