world of amoeboid organisms

D. bartosi after Stepanek, 1952

Difflugia bartosi Stepanek, 1952

Diagnosis: Test broadly pyriform with a relatively small neck; with one or two rows of conical excrescences.

Stepanek (1952): “From the almost globular body of the test starts a moderately narrowed neck with a circular aperture. On the underside are ten conical excrescences arranged.in two circles above and below the equator of the spherical part of the test. In the upper circle, i. e. the one nearer the neck, are four conical excrescences oriented as if they were arranged in the corners of a square. These excrescences project, a little upwards, in the lower circle are six such excrescences, again as if placed in the corners of a regular hexagon, but in relation to the upper ones they are somewhat inclined downwards. Seen from above none of the excrescence of the upper circle covers any of the lower circle of excrescences. On the whole we can say that the axes of the conical excrescences stand always perpendicular to the axis of the test. The color of the test is grayish black, with rather large sand grains, and with several green symbiotic algae inside. There is one spherical nucleus. The plasm is granular to foamy, with numerous inclusions and large vacuoles.”

Dimensions: Length 245.5 µm, width 192.5 µm, neck 35 µm long, aperture 70 µm, nucleus 22 µm.

Ecology: Freshwater pond, near Prague.

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