Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Heterocentrotus mamillatus (ambulacral plates) Description At the peristome the pore-pairs are crowded, but the pore zone itself is not markedly widened.Scale 2 mm. Author Mortensen, Theodor JPG file - 116.42 kB - 890 x 680 pixels added on 2005-02-23312 viewsFrom reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha... © 2005 Mortensen, Theodor Click here to return to the thumbnails overview