Wikipedia
Sclerobionts are collectively known as organisms living in or on any kind of hard substrate (Taylor and Wilson, 2003). A few examples of sclerobionts include Entobia borings, Gastrochaenolites borings, Oichnus borings, Talpina borings, serpulids, encrusting oysters, encrusting foraminiferans, Stomatopora bryozoans, and “Berenicea” bryozoans.
Image:EntobiaVoigtoporaCoonCreek.jpg| Entobia sponge borings and the cyclostome bryozoan Voigtopora thurni on an oyster valve from the Coon Creek Beds of the Ripley Formation (Upper Cretaceous) near Blue Springs, Mississippi. Image:BoredEncrustedShell.JPG| Another example of Entobia sponge borings and encrusting serpulid worms on a modern shell of the bivalve Mercenaria in North Carolina. Image:ThecideanZalas.jpg|Thecideide brachiopod (T), sabellid worm tube (S) and bryozoans (B) on the shell of the bivalve Ctenostreon from the Upper Jurassic of Poland. Image: SerpulidsPecten.JPG|''Serpulid '' worms enrusting Pecten; Duck Harbor Beach on Cape Cod Bay, Wellfleet, Massachusetts.