Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Astropyga radiata (apical system) Description Part of apical system: The elongated genital plates and the enlarged madreporite expand into the interambulacra.Scale 5 mm. Author Schultz, Heinke JPG file - 387.74 kB - 2 112 x 1 224 pixels added on 2005-02-23266 viewsFrom reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha... © 2005 Schultz, Heinke Click here to return to the thumbnails overview