All structures supporting and protecting the sponge body. Architecture of the Skeleton of Demospongiae. The skeleton of sponges consists of microscopic calcareous or silicious spicules. The demosponges include 90% of all species of sponges. Their "skeletons" are made of spicules consisting of fibers of the protein spongin, the mineral silica, or both. Where spicules of silica are present, they have a different shape from those in the otherwise similar glass sponges[WP].

http://purl.obolibrary.org/obo/PORO_0000532

Architecture of the Skeleton of Demospongiae. The skeleton of sponges consists of microscopic calcareous or silicious spicules. The demosponges include 90% of all species of sponges. Their "skeletons" are made of spicules consisting of fibers of the protein spongin, the mineral silica, or both. Where spicules of silica are present, they have a different shape from those in the otherwise similar glass sponges[WP].

All structures supporting and protecting the sponge body.

skeleton

PORO:0000532

skeleton

http://purl.obolibrary.org/obo/PORO_0000938