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Rhizosolenia (Bacillariophyceae)

Rhizosolenia sp. spiney tip of cell
Most of the cell volume is between the two valves, covered with intercalary disks.

Rhizosolenia sp. -- junction of two recently divided cells.
Short trichomes may form until cells disengage after vegetative division.

Rhizosolenia sp.

Rhizosolenia hebata
Photograph posted online

Rhizosolenia styliformis
Photograph posted online

Rhizosolenia sp. from Casco Bay off Falmouth, Maine 31 Oct. 2011
Note that process (spine) is very short in this species, and extends from an otarium, previously called a wing (short segment at base of process).

Rhizosolenia sp. from Casco Bay off Falmouth, Maine 31 Oct. 2011
Prolonged silica process (spine) extends to the left margin in this photograph

Rhizosolenia sp. from Casco Bay off Falmouth, Maine 31 Oct. 2011

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