The Hyolithida are lophophorates, one of the two orders of hyolithid, 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 lacking additional paired, curved, whiskerlike appendages. The Hyolithida were probably bottom feeders living in shallow water, and had tentacules.[2]

Temporal range: Early Cambrian – Upper Permian[1]
Scientific classification
Kingdom: Animalia
Clade: Lophophorata
Clade: Brachiozoa
Class: Hyolitha
Order: Hyolithida
Sussoiev, 1957

See text


  1. Malinky, J. M. (2009). "Permian Hyolithida from Australia: The Last of the Hyoliths?". Journal of Paleontology. 83: 147–152. doi:10.1666/08-094R.1.
  2. Marek, Ladislav; Yochelson, Ellis L. (1976). "Aspects of the biology of Hyolitha (Mollusca)". Lethaia. 9 (1): 65–82. doi:10.1111/j.1502-3931.1976.tb00952.x.

Further reading

  • Malinky, John M. (1989). "New Early Paleozoic Hyolithida and Orthothecida (Hyolitha) from North America". Journal of Paleontology. 63 (3): 302–319. doi:10.1017/S0022336000019454. JSTOR 1305500.
  • Marek, Ladislav (1976). "On the ontogeny in Hyolithida". Časopis Pro Mineralogii a Geologii. 21 (3): 277–283.

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