portrait

Description:

Tetradimorpha, a dimorphid helioflagellate. Four weakly oscillating flagella are seen emerging from the cell at the top of the cell. Axopodia with extrusomes radiate around the circumference of the cell. The axopodia may be completely withdrawn into the cell when it is disturbed. Although the size of these individuals is smaller than that described for T. pterbica (65-95 microns) the circumferential distribution of axopodia and the complete withdrawal of axopods and the shorter flagella are consistent with descriptions of T. pterbica. From temporary rainwater pool near Boise, Idaho. Phase contrast illumination