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Gonyostomum (Raphidiophyceae)

Gonyostemum semen

Gonyostemum semen

Gonyostemum semen

Gonyostemum semen

Gonyostemum semen

Gonyostemum semen

Gonyostemum semen, Swain's Lake, Barrington, NH USA 27 July 2010

Gonyostemum semen, Swain's Lake, Barrington, NH USA 27 July 2010

Gonyostemum semen, Swain's Lake, Barrington, NH USA 27 July 2010

Gonyostemum semen, Swain's Lake, Barrington, NH USA 27 July 2010

Gonyostemum semen, Swain's Lake, Barrington, NH USA 27 July 2010, dominant phytoplankton

Gonyostemum semen, Swain's Lake, Barrington, NH USA 27 July 2010, dominant phytoplankton. One Peridinium sp. cell in center. Green masses are colonial cyanobacteria, probably Aphanothece.

Gonyostemum semen, Swain's Lake, Barrington, NH USA 27 July 2010
No flagella were seen in clusters of cells suggesting a palmelloid stage in the life cycle.
Green masses are colonial cyanobacteeria, probably Aphanothece.

Gonyostemum semen, Swain's Lake, Barrington, NH USA 27 July 2010
Many cells have a notch along one margin.

Life cycle of Gonyostemum semen (Figueroa and Rengefors 2006)

Figueroa, R.I., and K. Rengefors 2006. Life cycle and sexuality of the freshwater raphidophyte Gonyostomum semen (Raphidophyceae). Journal of Phycology 42:859-871.

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