The scientific classification of Orthida is kingdom animalia, phylum brachiopoda and class rhynchonellata which have well developed pedicle attachment.
Animalia Kingdom: Phylum: Brachiopoda Class: Rhynchonellata The Rhynchonellata is a class of Lower Cambrian to Recent articulate brachiopods that combines orders from within the Rhynchonelliformea (Articulata revised) with well developed pedicle attachment. 
