Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Echinus acutus (ambulacral plates) Description a. Ambulacral plates: The fine granulation covering all plates and the radiating striae along the outer part of the ambulacral plates may be more or less distinct.Scales 5 mm. Author Schultz, Heinke JPG file - 131.89 kB - 752 x 904 pixels added on 2005-02-23838 viewsFrom reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha... © 2005 Schultz, Heinke Click here to return to the thumbnails overview