Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Echinus esculentus (ambulacral plates) Description Ambulacral plates: The primary tubercles are developed only on every second or third plate and the secondaries are almost the same size.Scales 5 mm. Author Mortensen, Theodor JPG file - 285.40 kB - 1 437 x 1 032 pixels added on 2005-02-231 232 viewsFrom reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha... © 2005 Mortensen, Theodor Click here to return to the thumbnails overview