It was a solitary coral, meaning it did not make reefs by growing together with other corals. Solitary rugose corals range in size from a couple of millimeters in diameter and in length to 14 centimeters in diameter and close to 1 meter in length. Rugose corals lived from the Middle Ordivician to the Late Permian. The sample collected was very well preserved and has well defined horizontal growth lines on it. Phylum Echinodermata, Crinoid Stem Crinoid stems are pieces of organisms that belong in the phylum Echinodermata.
Echinoderms have a very long fossil record.
There are more extinct fossil species than there are living species today. Fifteen extinct classes of fossil echinoderms have been identified. These are different from the five living classes of today. Since fossil echinoderms are considered so interesting, the fossil record, even though it is not complete, is almost as well studied as any other group of fossil invertebrates. Crinoids are suspension feeders in the subphylum Crinozoa, class Crinoidea.