Holasteridae

== Translingual == === Etymology === Holaster +‎ -idae. === Proper noun === Holasteridae A taxonomic family within the order Spatangoida – certain heart urchins. ==== Hyponyms ==== (family): Stereopneustes (genus) †Holaster (extinct genus) === Further reading === Spatangoida on Wikipedia.Wikipedia Holasteridae on Wikispecies.Wikispecies