Hyolithida
Extinct order of lophotrochozoans
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The Hyolithida are lophotrochozoans, one of the two orders of hyoliths, the other being the Orthothecida. Most of our knowledge of the hyolithids comes from studies on the Hyolitha.[2] Both orders had an operculum that was not hinged to the conch. However, the Hyolithida are distinct from the Orthothecida in having additional paired, curved, tusk-like appendages. The Hyolithida were probably bottom feeders living in shallow water, and had tentacules.[2]
Class:†Hyolitha
Order:†Hyolithida
Sussoiev, 1957
Sussoiev, 1957
| Hyolithida Temporal range: | |
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Scientific classification  | |
| Kingdom: | Animalia |
| Class: | †Hyolitha |
| Order: | †Hyolithida Sussoiev, 1957 |
| Families | |
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See text | |
Families
- †Aimitidae Sysoiev, 1968
- †Aladracidae Geyer, 2017
- †Altaicornidae Sysoiev, 1970
- †Amydaicornidae Valkov, 1975
- †Angusticornidae Sysoiev, 1968
- †Australothecidae Malinky, 2009
- †Carinolithidae Marek in Valent, Fatka, Szabad & Vokáč, 2011
- †Crestjahitidae Sysoiev, 1968
- †Galicornidae Valkov, 1975
- †Hyolithidae Nicholson, 1872
- †Nelegerocornidae Meshkova, 1974
- †Notabilitidae Sysoiev, 1968
- †Pauxillitidae Marek, 1967
- †Pterygothecidae Sysoiev, 1958
- †Similothecidae Malinky, 1988
- †Trapezovitidae Valkov, 1975
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