Download or read book Echinoidea written by Heinke A.G. Schultz and published by Walter de Gruyter GmbH & Co KG. This book was released on 2015-11-13 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the first of two books about sea urchins (echinoids) since 1953 (Th. Mortensen). The detailed and coloured illustrated descriptions enable the reader to identify all species living today in our oceans. Recent scientific searchings are included. Volume I. describes the sea urchins with pentameral symmetry and either with a few spines (cidaroids) or with more or less numerous spines ("regulars") living on the sea floor.