| Astylozoon Engelmann, 1862 (syn. Geleiella). Several species. |
   |
| Hastatella Erlanger, 1890. Few species. |
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| Contents | Classes | Subclasses | Orders | Suborders | Families |
Family ASTYLOZOIDAE Kahl, 1935
| Syns. | Astylozooidae, Astylozoonidae, Hastatellidae |
Stalkless, mobile, planktonic forms, with one or two rigid caudal bristles; organisms resemble zooids of Vorticella broken away from stalk; mature form swims with apical pole forward, telotroch with antapical end first; two or more prominent circlets of curious spines in second genus.
| Astylozoon Engelmann, 1862 (syn. Geleiella). Several species. |
|
| Hastatella Erlanger, 1890. Few species. |
|