Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Heterocentrotus mamillatus (ambulacral plates) Description Ambulacral plates: Above the ambilus the primary tubercles abruptly increase in size.Scale 1 mm. Author Mortensen, Theodor JPG file - 90.12 kB - 573 x 985 pixels added on 2005-02-23306 viewsFrom reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha... © 2005 Mortensen, Theodor Click here to return to the thumbnails overview