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Temporal range: Triassic–Recent
Thecideide brachiopod (T), sabellid worm tube (S) and bryozoans (B) on the shell of the bivalve Ctenostreon from the Jurassic of Poland
Scientific classification e
Kingdom: Animalia
Clade: Lophophorata
Phylum: Brachiopoda
Class: Rhynchonellata
Order: Thecideida
Elliott, 1958

See text.

Thecideida is an order of cryptic articulate brachiopods characterized by their small size and habit of cementing their ventral valves to hard substrates such as shells, rocks and carbonate hardgrounds. Thecideides first appear in the Triassic (Jaecks and Carlson, 2001) and are common today (Lüter, 2005; Lüter et al., 2007).

Thecidium mediterraneum, A. natural size: B. section through shell (magnified)


Order Thecideida


  • Paleobiology Database on thecideides
  • Jaecks, G.S.; Carlson, S.J. (2001). "How phylogenetic inference can shape our view of heterochrony: examples from thecideide brachiopods". Paleobiology. 27 (2): 205–225. doi:10.1666/0094-8373(2001)027<0205:hpicso>;2.
  • Lüter, C. (2005). "The first Recent species of the unusual brachiopod Kakanuiella (Thecideidae) from New Zealand deep waters". Systematics and Biodiversity. 3: 105–111. doi:10.1017/s1477200004001598.
  • Lüter, C.; Hoffmann, J.; Logan, A. (2007). "Cryptic speciation in the Recent thecideide brachiopod Thecidellina in the Atlantic and the Caribbean". Earth and Environmental Science Transactions of the Royal Society of Edinburgh. 98: 405–413. doi:10.1017/s1755691007078449.