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Stephanodiscus (Bacillariophyceae)

Stephanodiscus astraea from Lake Morey, VT USA collected by Carol Elliott.
Crown of short spines is visible along periphery of valve.
Note numerous chloroplasts (golden-brown in color).

Stephanodiscus astraea from Lake Morey, VT USA collected by Carol Elliott.
Between valve and girdle view again shows corona of short silicaceous spines.

Stephanodiscus astraea from Lake Morey, VT USA collected by Carol Elliott.
Girdle view

Stephanodiscus astraea from Lake Morey, VT USA collected by Carol Elliott.

Stephanodiscus astraea from Lake Morey, VT USA collected by Carol Elliott.

Stephanodiscus astraea from Lake Morey, VT USA collected by Carol Elliott.
Girdle band (a.k.a. cingulum)?

Stephanodiscus sp. from marine sediments, Miyagi-ken Prefecture in Japan.
Apparently tidal wave deposits that occurred throughout modern history. Stephanodiscus is very common in this sample. Photographed with bright field, a composite of 15 images, post-processing with Adobe PhotoShop, measurement taken with Zeiss AxioVision, by © David "Frez" Tetreault, Plaistow, NH USA.

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