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Cyclostephanos
Cyclostephanos are small disc centrics which are commonly found in Lake Mendota. Their abundance in the summer may indicate eutrophication or poorer water quality, since Cyclostephanos species are known for their ability thrive in nutrient-rich environments even if elevated levels of salt and other particulates are present.
C. dubius
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Cells are 8.6-18.5 µm in diameter.
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Costae are 9-12 per 10 µm.
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Rows of costae are prominent, radiating outwards. There are two well-defined areas of the cell, a center and outer ring, which have concavity. Cells often maintain their lines all the way to the center, but the center may also be scattered.
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C. dubius may be differentiated from Stephanodiscus by its lack of spines.
For more information, visit diatoms.org here.
A8m1 Cyclostephanos dubius12_edited
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A8m1 Cyclostephanos dubius14_edited
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A3m3 Cyclostephanos dudius11_edited
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A3m1 Cyclostephanos dubius deep interior_edited
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A3m1 Cyclostephanos dubius4_edited
A3m1 Cyclostephanos dubius6_edited
A5m1 Cyclostephanos dubuis.1_edited
C. invisitatus
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Cells are 7.8 - 15.1 µm in diameter
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12-15 rows of striae in 10 µm at circumference.
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May be differentiated from C. dubius by a lack of prominent central areolae and a flat disc shape
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Easily identified by a small ring at the center of the disc (seen best in picture 1).
For more information, visit diatoms.org here.
A8m1 L. invisitatus-ish, center circle_edited
A3m1 Cyclostephanos invisitatus_edited
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A8m1 L. invisitatus-ish_edited
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