LG Zachos… - Computational Paleontology, 2011 - books.google.com ... The skeleton is divided into three structurally distinct parts called the corona, which makes up the major portion of the echinoid skeleton; the apicalsystem of plates, located at the apex of the test and which usually consists of four or five genital plates and five ocular plates; and ... Related articles
LG Zachos… - Computational Paleontology, 2011 - books.google.com ... The skeleton is divided into three structurally distinct parts called the corona, which makes up the major portion of the echinoid skeleton; the apicalsystem of plates, located at the apex of the test and which usually consists of four or five genital plates and five ocular plates; and ... Related articles