Thalassiosirales

Note that the delicate spines are chitinous. Focus on valve surface. Scale bar indicates 50 µm. The image was built up using several photomicrographic frames with manual stacking technique.  Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera. 

Thalassiosira (tha-lassy-owe-sire-a) eccentrica is one of the hundred or so species in the diverse and common genus of centric diatoms frequently found in marine waters. Some species can be very large. Species are distinguished primarily by the pattern of sculpting in the valve elements of the shell or frustule. The cell to the left is seen in girdle view, the one to the right in valve view. The margins of the valves give rise to a small number of fine chitinous filaments which are believed to function in flotation. These filaments are evident in arising from the cell to the right. With many small golden plastids. Phase contrast microscopy. data on this strain.

Chain of Porosira glacialis. Note that the delicate spines are chitinous. Focus on frustule surface. Scale bar indicates 50 µm. The image was built up using several photomicrographic frames with manual stacking technique.  Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera. 

Inside view of lacunate valve. Note the position of the fultoportula on a valve face stria, taking the place of an areola. Specimen from single cell culture from Cleveland Harbor, Cleveland, Ohio, by E. Theriot.

Thalassiosira nordenskioeldii.Scale bar indicates 50 m. The image was built up using several photomicrographic frames with manual stacking technique. Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.For more look at www.protisten.de/english/gallery_main/gallery_main.htmlFor high-resolution images please ask postmaster@protisten.de.

Porosira glacialis.Short chain of Porosira glacialis. Note that the delicate spines are chitinous. Scale bar indicates 50 m. The image was built up using several photomicrographic frames with manual stacking technique. Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.For more look at www.protisten.de/english/gallery_main/gallery_main.htmlFor high-resolution images please ask postmaster@protisten.de.

Reboredo, Galicia, Spain

Lardero, La Rioja, Espaa

Grove, O, Galicia, Spain

Thalassiosira punctigera.Some specimen of this centric diatom carried naviculoid ones on the valve(s). Scale bar indicates 25 m. The image was built up using several photomicrographic frames with manual stacking technique. Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.For more look at www.protisten.de/english/gallery_main/gallery_main.htmlFor high-resolution images please ask postmaster@protisten.de.

Thalassiosira lundiana.Labiate processes and chitinous spines are visible. Scale bar indicates 25 m. The image was built up using several photomicrographic frames with manual stacking technique. Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.For more look at www.protisten.de/english/gallery_main/gallery_main.htmlFor high-resolution images please ask postmaster@protisten.de.

Thalassiosira rotula.The members of the colony are interconnected with a bundle of threads. Numerous delicate spines protruding from the valve's margin are visible. Scale bar indicates 50 m. The image was built up using several photomicrographic frames with manual stacking technique. Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.For more look at www.protisten.de/english/gallery_main/gallery_main.htmlFor high-resolution images please ask postmaster@protisten.de.

This image was made from samples taken during a scientific cruise in the Pacific. Water was filtered to concentrate the organisms that were present, then dried onto a thin sheet of plastic and then shadowed with a fine layer of metal to provide contrast. The preparation was then observed with an electron-microscope. This technique has been used to document the diversity of marine microbes, especially, protists in the oceans.

Marginal silica processes are visible. Scale bar indicates 25 µm. The image was built up using several photomicrographic frames with manual stacking technique.  Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera. 

Thalassiosira (tha-lassy-owe-sire-a) eccentrica is one of the hundred or so species in the diverse and common genus of centric diatoms often found in marine waters. Some species can be very large. Species are distinguished primarily by the pattern of sculpting in the valve elements of the shell or frustule. This species has a seven-fold symmetry in the strutting which lies immediately below the surface of the valve, and can be seen in this isolated valve. Differential interference microscopy. data on this strain.

Chain of Porosira glacialis. Note that the delicate spines are chitinous. Focus on cell center showing cytoplasmic accumulation around the nucleus. Scale bar indicates 50 µm. The image was built up using several photomicrographic frames with manual stacking technique.  Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera. 

Scanning electron micrograph of interior of scutate valve. Note position of fultoportula in central area of valve face. Specimen from culture of cell isolated from Cleveland Harbor,  Cleveland, OH, USA, by E. Theriot.

Long chain of Porosira glacialis. Note that the delicate spines are chitinous. Scale bar indicates 100 m. The image was built up using several photomicrographic frames with manual stacking technique. Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.For more look at www.protisten.de/english/gallery_main/gallery_main.htmlFor high-resolution images please ask postmaster@protisten.de.

Reboredo, Galicia, Espaa

Thalassiosira punctigera.The image shows numerous chitinous spines which minimize their sedimentation speed. Scale bar indicates 25 m. The image was built up using several photomicrographic frames with manual stacking technique. Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.For more look at www.protisten.de/english/gallery_main/gallery_main.htmlFor high-resolution images please ask postmaster@protisten.de.