Thecideida Temporal range: Triassic–Recent PreꞒ Ꞓ O S D C P T J K Pg N
Thecideide brachiopod (T), sabellid worm tube (S) and bryozoans (B) on the shell of the bivalve Ctenostreon from the Jurassic of Poland
Scientific classification
Kingdom:	Animalia
Phylum:	Brachiopoda
Class:	Rhynchonellata
Order:	Thecideida Elliott, 1958
Superfamilies
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 appeared in the Triassic^[1] and are common today.^[2][3]

1. ^ 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>2.0.co;2.
2. ^ Lüter, C. (2005). "The first Recent species of the unusual brachiopod Kakanuiella (Thecideidae) from New Zealand deep waters". Systematics and Biodiversity. 3 (1): 105–111. Bibcode:2005SyBio...3..105L. doi:10.1017/s1477200004001598.
3. ^ 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>2.0.co;2.

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