This is a vent view of a sample of Arcella vulgaris from a municiple sludge. The fine structure around the vent
can be seen 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
Arcella vulgaris is a rhizopoda of the Order Testacida and Family Arcellidae. It is a very common Thecamoebian.
Significance in the Environment:
Arcella vulgaris is a circular dome with a concave small central vent underneath. The test has a pattern of hexagons that are each about
one micrometer across.
Jahn, T. L., HOW TO KNOW THE PROTOZOA, Wm. C. Brown Co. Publ., p. 126, 1949.
Scott, DAVID B., FRANCO S. Medioli, and Charles T. Schafer, MONITORING IN COASTAL ENVIRONMENTS USING FORAMINIFERA AND THECAMOEBIAN INDICATORS,
Cambridge University Press, 2001.