English Cidaris cidaris Cited by user Cwmhiraeth on 26 Apr 2013 Cidaris cidaris is a species of sea urchin commonly known as the long-spine slate pen sea urchin.
English Phormosoma placenta Cited by user Cwmhiraeth on 30 Dec 2012 Phormosoma placenta is a species of sea urchin in the order Echinothurioida. It is a deep water species, seldom being found at depths less than, and occurs on either…