0 Talk Crinoid Edit Fossil Record Crinoids, also known as sea lilies, are echinoderms found from the Ordovician to the present day. Read more An invertebrate is an animal without a vertebral column. The group includes 95% of all animal... Invertebrate Cheirothyris is a genus of fossil brachiopod from the Late Jurassic period. The shells of this... Cheirothyris Jellyfish (also known as jellies or sea jellies) are free-swimming members of the phylum... Jellyfish Related Categories Category: Invertebrates Add category