Data PolicyPublications | Persons | Institutes | Projects IMIS Photogallery » References Asthenosoma varium (aboral secondary spines) Description The aboral secondary spines end in a very sharp point covered by a thick skin-sheath containing the poison gland.Scale 1 mm. Author Schultz, Heinke JPG file - 128.30 kB - 1 063 x 1 772 pixels added on 2005-02-23234 viewsFrom reference Schultz, H. (2006). Sea urchins: A guide to worldwide sha... © 2005 Schultz, Heinke Click here to return to the thumbnails overview