Triangular calcified papillae (often five) placed radially around the anus of some Holothuriidae [ http://species-identification.org/species.php?species_group=nasc&selected=definitie&menuentry=woordenlijst&record=Anal%20teeth https://www.karger.com/Article/Pdf/142845 https://orcid.org/0000-0002-6601-2165 ]