Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Calveriosoma hystrix (ambulacral plates) Description Peristomial plates: The pore-pairs occur in double series distally (in red). (The buccal membrane is shaded.). After Mortensen (1935).Scale 3 mm. Author Schultz, Heinke JPG file - 131.03 kB - 919 x 543 pixels added on 2011-02-23511 viewsFrom reference Schultz, H. (2011). Sea urchins III: Worldwide regular de... © 2011 Schultz, Heinke Click here to return to the thumbnails overview