Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Phyllacanthus forcipulatus (section of primary spine) Description Part of transverse section of primary spine: The furrows between the ridges are set with coarse cortical hairs.Scale 500 µ. Author Mortensen, Theodor JPG file - 75.56 kB - 862 x 358 pixels added on 2011-02-23185 viewsFrom reference Schultz, H. (2011). Sea urchins III: Worldwide regular de... © 2011 Mortensen, Theodor Click here to return to the thumbnails overview