What is Periostracum?
[[File:Periostrakum.jpg|thumb|Periostracum on a shell.]] '''Periostracum''' is a thin coat or skin on the outside of the shells of [[molluscs]], [[brachiopods]] and other animals with shells.<ref name=SD>{{cite web|url=https://www.sciencedirect.com/topics/veterinary-science-and-veterinary-medicine/periostracum|publisher=Science Direct|title=Periostracum|accessdate=May 28, 2021}}</ref> ==References== {{reflist}} {{biology-stub}} [[Category:Skin]] [[Category:Molluscs]] [[Category:Animal anatomy]]