1.5" Fossil Crinoid And Bryozoan - Anna, Illinois

Fossil Crinoid And Bryozoan - Anna, Illinois #114370

This is a detailed, 1.5" crinoid (Phanocrinus) from Frailey's Formation, Anna, Illinois. It is the calyx (body) and pinnules (feeding arms). There are also a number of other fossils in this specimen including the bryozoan archemedes screw (Archemedes). The quality of preparation on this fossil is very nice - using skillful air-abrasion techniques under a stereo microscope.

It comes with an acrylic display stand.

Crinoids, sometimes commonly referred to as sea lilies, are animals, not plants. They are echinoderms related to starfish, sea urchins, and brittle stars. Many crinoid traits are like other members of their phylum; such traits include tube feet, radial symmetry, a water vascular system, and appendages in multiples of five (pentameral). They first appeared in the Ordovician (488 million years ago) and some species are still alive today.

Bryozoans are microscopic aquatic invertebrates that live in colonies, forming skeletal structures similar to corals. Each skeletal structure has a form unique to each particular species. The individual byrozoans forming these colonies are fileter feeders called zooids, straining nutrients from the surrounding water.

About Crinoids