Trepostomatida

Trepostomatida
Temporal range: Early Ordovician–Triassic
Esthoniopora, a trepostome from the Ordovician of Estonia (cross-section).
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Bryozoa
Class: Stenolaemata
Order: †Trepostomatida
Ulrich 1882[1]
Suborders[2]
Synonyms
  • Trepostomata
  • Trepostomida
Trepostome bryozoan with bioerosion; Bellevue Formation, Upper Ordovician (Katian), northern Kentucky.

Trepostomatida (the trepostomates or trepostomes) is an extinct order of bryozoans in the class Stenolaemata. Trepostome bryozoans possessed mineralized calcitic skeletons and are frequently fossilized; some of the largest known fossilized bryozoan colonies are branching trepostomes and massive dome-shaped trepostomes. [3] Trepostomes did not have many specialized zooecia beyond ordinary feeding autozooecia. The two main known heteromorphs are exilazooecia and mesozooecia, which have the purpose of maintaining regular spacing between autozooecia. [4]

References

  1. ^ Redescription of type specimens of bryozoan Stigmatella from the Upper Ordovician of the Toronto region, Ontario (1973). By Fritz, Madeleine A., 1896, Royal Ontario Museum
  2. ^ Bock P, ed. (2025). "Trepostomatida †". World list of Bryozoa. World Register of Marine Species. Retrieved 2 February 2026.
  3. ^ Ernst, Andrej (2020). "2- Fossil record and evolution of Bryozoa". Phylum Bryozoa. pp. 11–56.
  4. ^ Ernst, Andrej (2020). "2- Fossil record and evolution of Bryozoa". Phylum Bryozoa. p. 19.
Heterotrypa sp., a trepostome bryozoan from the Corryville Formation (Upper Ordovician) in Covington, Kentucky.
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