Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Echinostrephus aciculatus (ambulacra) Description Four pore-pairs per arc are developed in the ambulacra, the uppermost larger than the others.Scale 1 mm. Author Schultz, Heinke JPG file - 68.94 kB - 709 x 654 pixels added on 2005-02-23262 viewsFrom reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha... © 2005 Schultz, Heinke Click here to return to the thumbnails overview