Dekayia is an extinct genus of Ordovician bryozoans of the family Heterotrypidae. Its colonies can be branching, encrusting, or massive. All species have acanthopores in varying sizes and numbers. ^[1] The autozooecia appear angular or sub-angular viewed through a cross-section of the colony, and their walls are distinctively undulating or crenulated. Maculae generally protrude from the colony surface very little or at all, and can contain unusually large autozooecia and a cluster of mesozooecia in their centers.^[2]

Dekayia
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Bryozoa
Class:	Stenolaemata
Order:	†Trepostomata
Family:	†Heterotrypidae
Genus:	†DekayiaMilne-Edwards & Haime, 1851 References edit ^ Boardman, Richard S.; Utgaard, John (September 1966). "A Revision of the Ordovician Bryozoan Genera Monticulipora, Peronopora, Heterotrypa, and Dekayia". Journal of Paleontology. 40 (5). SEPM Society for Sedimentary Geology: 1103. ^ Ernst, Andrej; Key, Marcus (2007). "Upper Ordovician Bryozoa from the Montagne de Noire, Southern France". Journal of Systematic Palaeontology. 5 (4): 375. Bibcode:2007JSPal...5..359E. doi:10.1017/S1477201907002155. S2CID 85115257.