Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Echinus acutus (interambulacral plates) Description b. Interambulacral 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 - 165.72 kB - 914 x 1 022 pixels added on 2005-02-23836 viewsFrom reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha... © 2005 Schultz, Heinke Click here to return to the thumbnails overview