Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Astropyga pulvinata (interambulacrum) Description Interambulacrum: The inner secondary tubercles continue to the apical system, the primaries disappear abruptly.Scale 10 mm. Author Schultz, Heinke JPG file - 109.06 kB - 848 x 859 pixels added on 2005-02-23226 viewsFrom reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha... © 2005 Schultz, Heinke Click here to return to the thumbnails overview