Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Asthenosoma varium (oral primary spines) Description In all species of the echinothuriids the oral primary spines are equipped with a distal hoof. Hoofs (arrows) on the oral side of Asthenosoma varium.Scale 10 mm. Author Schultz, Heinke JPG file - 176.35 kB - 945 x 637 pixels added on 2011-02-23251 viewsFrom reference Schultz, H. (2011). Sea urchins III: Worldwide regular de... © 2011 Schultz, Heinke Click here to return to the thumbnails overview