Vannellidae tend to be flattened and fan-shaped during motion, although some are long and narrow, and have a prominent clear margin at the anterior. In most amoebae, the endoplasm glides forward through the center of the cell, but vannellids undergo a sort of rolling motion with the outer membrane sliding around like a tank tread. These amoebae are usually 10-40 μm in size, but some are smaller or larger.
Vannellidae are surrounded by an outer covering called the glycocalyx, which is generally 10-20 nm across, though the thickness varies among species. In some species, a layer of hair-like filaments called glycostyles protrudes from the glycocalyx.
- Moselio Schaechter, ed. (2011). "Protists". Eukaryotic Microbes. Academic Press. p. 202. ISBN 9780123838773.
- Smirnov AV, Nassonova ES, Chao E, Cavalier-Smith T (July 2007). "Phylogeny, evolution, and taxonomy of vannellid amoebae". Protist. 158 (3): 295–324. doi:10.1016/j.protis.2007.04.004. PMID 17602867.
- "Family Vannellidae Bovee, 1970". Microworld. Retrieved 4 July 2016.
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