Hyolithida
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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 |
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See text | |
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]
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