Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Psilocidaris echinulata (ambulacral plates + apical system) Description a. Ambulacral plates, b. Part of apical system.a Scale 2 mm, b. Scale 6 mm. Author Mortensen, Theodor JPG file - 53.23 kB - 383 x 536 pixels added on 2011-02-23194 viewsFrom reference Schultz, H. (2011). Sea urchins III: Worldwide regular de... © 2011 Mortensen, Theodor Click here to return to the thumbnails overview