English Centrostephanus longispinus Cited by user Cwmhiraeth on 30 Jan 2013 Centrostephanus longispinus, the hatpin urchin, is a species of sea urchin in the family Diadematidae.
English Echinoderm Cited by user Cwmhiraeth on 30 Jan 2013 Echinoderms (Phylum Echinodermata from Ancient Greek, ἐχῖνος, echinos – "hedgehog" and δέρμα, derma – "skin") are a phylum of marine animals.