Byssally attached, epifaunal bivalves. Notable for their thick inner nacreous layer.
Phylogeny:
Class Bivalvia
Family Pteriidae Gray, 1847
Pinctada margaritifera (Linnaeus, 1758)
Scratchpads developed and conceived by (alphabetical):
Ed Baker,
Katherine Bouton
Alice Heaton
Dimitris Koureas,
Laurence Livermore,
Dave Roberts,
Simon Rycroft,
Ben Scott,
Vince Smith