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The ”’Hyolithida”’ are [[ |
The ”’Hyolithida”’ are [[]], one of the two orders of [[]], the other being the [[Orthothecida]]. Most of our knowledge of the hyolithids comes from studies on the Hyolithida.<ref name=”Aspects”>{{Cite journal|author1=Marek, Ladislav |author2=Yochelson, Ellis L. |year=1976 |title=Aspects of the biology of Hyolitha (Mollusca) |journal=Lethaia |volume=9 |issue=1 |pages=65–82|doi=10.1111/j.1502-3931.1976.tb00952.x|bibcode=1976Letha…9…65M }}</ref> Both orders had an [[operculum (gastropod)|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.<ref name=”Aspects” /> |
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==Families== |
==Families== |
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Revision as of 17:55, 24 January 2026
Extinct order of molluscs
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 Hyolithida.[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]
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
References
Further reading
