Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Heterocentrotus mamillatus (aboral) Description Upper side: The primary spines are long and robust with a triangular point. They serve to wedge the echinoid between coral blocks in heavy water motion. The secondary spines are short cut.Diameter with spines 136 mm; Hawaii. Author Schultz, Heinke JPG file - 96.35 kB - 945 x 692 pixels added on 2011-02-23315 viewsFrom reference Schultz, H. (2011). Sea urchins III: Worldwide regular de... © 2011 Schultz, Heinke Click here to return to the thumbnails overview