Patterson DJ, 1998 Free Living freshwater Protozoa. John Willey and Sons 223. Oxytricha figure 263 1998.
Pennak W. Robert, 1989, Fresh water Invertebrates of the United States, Protozoa to Mollusca. John Willey and Sons 628. Roitfer figure 11,1989
Pennak W. Robert, 1989 Fresh water Invertebrates of the United States. John Willey and Sons 206. Collotheca figure B.
Pennak W. Robert, 1989, Fresh water Invertebrates of the United States. John Willey and Sons 25. Vorticella figure D.
Leidy, Joseph, 1879, Fresh water Rhizopods of North America. Washington Printing office. Plate XVII figure 1.
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