Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Astropyga radiata (interambulacrum) Description Aboral interambulacrum: The outer rows of primary tubercles bordering the naked zone continue to the apical disc.Scale 10 mm. Author Schultz, Heinke JPG file - 136.71 kB - 984 x 979 pixels added on 2005-02-23281 viewsFrom reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha... © 2005 Schultz, Heinke Click here to return to the thumbnails overview