Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Parasalenia gratiosa (interambulacrum) Description lnterambulacrum: The primary tubercles are very large, leaving space only for a few much smaller secondaries.No scale. Author Mortensen, Theodor JPG file - 172.81 kB - 820 x 1 428 pixels added on 2005-02-23207 viewsFrom reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha... © 2005 Mortensen, Theodor Click here to return to the thumbnails overview