A new integrated search interface will become available in the next phase of marineinfo.org.For the time being, please use IMIS to search available data PeopleInstitutesProjectsData setsPublicationsEvents IMIS Photogallery » ReferencesEchinothurioida (aboral secondary spines)Description Points of echinothurioid spines: Aboral secondary spines with poison glands serving for defence: Left: Araeosoma thetidis: with a small venomous gland. Right: Asthenosoma varium: with a strongly inflated venomous gland.No scale provided.Author Mortensen, TheodorJPG file - 45.74 kB - 472 x 666 pixelsadded on 2011-02-23263 viewsFrom reference Schultz, H. (2011). Sea urchins III: Worldwide regular de...© 2011 Mortensen, TheodorClick here to return to the thumbnails overview