Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Phormosoma bursarium (apical system) Description The apical system is very variable in plate pattern and degree of extension into the interambulacra as in all species of Phormosoma.Scale 4 mm. Author Mortensen, Theodor JPG file - 126.56 kB - 1 417 x 431 pixels added on 2011-02-23216 viewsFrom reference Schultz, H. (2011). Sea urchins III: Worldwide regular de... © 2011 Mortensen, Theodor Click here to return to the thumbnails overview