Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Tetrapygus niger (test, aboral) Description Regular echinoid Tetrapygus niger, upper side.Diameter 48 mm; Valdivia, Chile. Author Schultz, Heinke JPG file - 444.51 kB - 1 569 x 1 685 pixels added on 2005-02-23381 viewsFrom reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha... © 2005 Schultz, Heinke Click here to return to the thumbnails overview