portrait

Description:

Histiobalantium is easy to distinguish from the similar genus Pleuronema by the stiff long cilia which intersperse the dense somatic ciliation. Histiobalantium have long cilia distributed over the whole cell whereas at Pleuronema this cilia are confined to the posterior region. The body of Histiobalantium natans is elliptical, with the right side slightly concave and anterior end a little narrower than the posterior. The peristome is deep, equipped with a well-developed undulating membrane. Several micronuclei are attached to the two round macronuclei. The contractile vacuole is located in the posterior half of the body. 55 - 105 microns long. From fresh water ponds and lakes. This specimen of Histiobalantium natans shows the stiff long cilia around the cell. 95 microns. From freshwater ponds near Konstanz, Germany. Differential interference contrast.