Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Aspidodiadema tonsum (apical system) Description Apical system: Each ocular plate carries a large tubercle on the inner edge.Scale 4 mm. Author Mortensen, Theodor JPG file - 129.03 kB - 827 x 816 pixels added on 2011-02-23456 viewsFrom reference Schultz, H. (2011). Sea urchins III: Worldwide regular de... © 2011 Mortensen, Theodor Click here to return to the thumbnails overview