| Urceolaria Stein, 1854 (a nomen conservandum, pending). Few species. IV 21a |
       |
| Contents | Classes | Subclasses | Orders | Suborders | Families |
Family URCEOLARIIDAE Dujardin, 1840
Body cylindrical, often slightly tipped to one side; adoral spiral (buccal ciliature) turns ca. 400°, with wide radius; denticles of skeletal ring smoothly linked, ca. 20 in number; compact macronucleus; no cortical rings; ectosymbionts of fresh-water turbellarians and marine polychaetes and molluscs (gill surfaces).
[The well-known generic name Urceolaria turns out to be a junior homonym, but the International Commission on Zoological Nomenclature will be petitioned to conserve it - even as the heterotrich Stentor has been preserved - because of its long-time usage and universal acceptance (the senior homonym is a little-known junior synonyn of the name of a rotifer). See brief comments on this intricate nomenclatural problem at the end of Chapter 13.]
| Urceolaria Stein, 1854 (a nomen conservandum, pending). Few species. IV 21a |
|