Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Asthenosoma varium (oral primary spines) Description The oral primary spines have a hoof developed at the distal end.Scale 5 mm. Author Schultz, Heinke JPG file - 45.76 kB - 549 x 1 303 pixels added on 2005-02-23241 viewsFrom reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha... © 2005 Schultz, Heinke Click here to return to the thumbnails overview