Skeletal Features of Scleractinian Coral
costa (pl. costae)
- extensions of the septa outside the wall of the corallite
columella
- central structure of the calyx formed by fusion of the lower elements of the septa
tuberculae
- larger-than-polyp bumps occurring in the coenosteum
verrucae
- larger-than-polyp bumps composed of several corallites
papillae
- smaller-than-polyp, nipple-like bumps on the surface of the skeleton