1. 
   Ostreoida
   (from the article `bivalve`) ...mantle margins unfused and often red, with long autotomizing tentacles; some swim weakly; marine; epibyssate with byssus sometimes formed into a ...
   Found op http://www.britannica.com/eb/a-z/o/37
   
   
2. 
   Ostreoida
   The order Ostreoida includes the true oysters and a number of other related families of bivalves. About eleven families are recognised within it, but suborders, superfamilies and subfamilies are used relatively heavily in this order. The following classification represents a synthesis of different ...
   Found op http://en.wikipedia.org/wiki/Ostreoida
   
   

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