| Contents | Classes | Subclasses | Orders | Suborders | Families |
Family VORTICELLIDAE Ehrenberg, 1838
| Syn. | Zoothamniidae |
With contractile stalk; all species colonial except in two genera (Haplocaulus, Vorticella); zooids not independently contractile among colonial forms (except in Carchesium); species all attached - to inanimate objects, plants, rotifers, crustaceans (amphipods, decapods, etc.), even turtles, etc. - in various fresh-water and marine habitats.
| Carchesium Ehrenberg, 1830. Several to many species. IV 16b |
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| Entziella Stiller, 1951. Single species. |
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| Haplocaulus Precht, 1935. Many species. |
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| Intranstylum Fauré-Fremiet, 1904 (syn. Intrastylum). Several species. |
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| Myoschiston Precht, 1935. Several species. |
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| Parazoothamnium Piesik, 1975. Single species. |
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| Pseudocarchesium Sommer, 1951. Several species. |
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| Rugaecaulis Lom [unpublished]. Single species. |
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| Tucolesca Lom, n. n. (for Leptodiscus Tucolesco, 1962 [hom. of Leptodiscus Hertwig, 1877 (dinoflagellate)] ). Single (and type-) species, T. mirabilis (Tucolesco, 1962) n. comb. |
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| Vorticella Linnaeus, 1767 (syn. Vorticellopsis). Very many (well over 150 described: but all bonafide?) species. IV 16a |
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| Zoothamnium Bory de St. Vincent, 1826 (syn. Zoothamnia). Very many (ca. 50) species. |
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| Incertae sedis: | |
| Craspedomyoschiston Precht, 1935, single species; |
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| Monintranstylum Banina, 1976, single species; |
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| Pseudovorticella Foissner & Schiffmann, 1975, few species. |