drawing of a extinct ordovician cystoids aristocystites bohemicus on a sea floor

animal aristocystites aristocystitidae art background body bohemicus crinoid crinoids crinozoa crinozoan cystoid cystoidea cystoids diploporita draw drawing echinoderm echinodermata extinct fine floor illustration marine mouth ordovic ordovician organism paint painted paleozoology pencil reconstruction sea sphaeronitida stalk stalks tentacles underwater wash watercolor watercolour zoological zoology