Cistoidea Fossil Crinoid mm 165 kg 1.1

Description

Origin : Ohio (U.S.A.)

Geological era : Devonian

Age : 400 million of years

Size : cm 16.5 x 13 x 3 - 1.1 kg

Fossil Crinoids Cistoidea sp. Perfect state, complete with cup and stem, on Slab cm 1.1 Kg - 16.5 x 13 cm x 3 h.

The crinoids are echinoderms, which is closely related to sea urchins and sea stars, are marked by a shrine consisting of numerous calcareous plates and a complex system of locomotion (interlocking aquifer) in which many small protrusions called pedicels "bloate" and "deflate" water adhering or detaching from the substrate.
There are two kinds of crinoids: those who live anchored to the seabed (isocrinids) and those who are allowed to move freely (comatulids), although movement will be at most a few meters.
Appeared in the Ordovician, the crinoids are sessil forms that have been widespread throughout the Paleozoic, forming the limestone to crinoids or encrinites.