This is a vent view of a sample of Centropyxis aculeata from a municiple sludge. Three of its spine structures
can be seen 3, 4, and 6 o'clock positions in this image. The color of this specimen is the result of an anaerobic environment with the iron
present in the cast converted in part to iron sulfide.
Transmitted Oblique Illumination
Centropyxis aculeata is a rhizopoda of the Order Testacida and Family Difflugiidae. It is a very common Thecamoebian.
Significance in the Environment:
In comparisons between the thecamoebian populations in freshwater lakes the presence of a higher proportion of Centopyxis aculeata may indicate
a more brackish condition.
Centropyxis aculeata is oval with 4-6 spines distal from the vent. It may be translucent to opaque, typically in shades of brown to black.
Jahn, T. L., HOW TO KNOW THE PROTOZOA, Wm. C. Brown Co. Publ., p. 127, 1949.
Scott, DAVID B., FRANCO S. Medioli, and Charles T. Schafer, MONITORING IN COASTAL ENVIRONMENTS USING FORAMINIFERA AND THECAMOEBIAN INDICATORS,
Cambridge University Press, p. 112, 2001.