Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Hygrosoma hoplacantha (ambulacral plates) Description Plate pattern of half an ambulacrum: The pore-pair of the primary plate forms a third vertical series.Scale 4 mm. Author Mortensen, Theodor JPG file - 66.15 kB - 715 x 615 pixels added on 2011-02-23221 viewsFrom reference Schultz, H. (2011). Sea urchins III: Worldwide regular de... © 2011 Mortensen, Theodor Click here to return to the thumbnails overview