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PrintCistoidea sp. (1)
Product code: F15639
Available: Yes
Provenience: Ohio (U.S.A.)
Geological Era: Devonian
Age: 400 million of years
Measure: cm
Unique Article
Description
perfect crinoids, 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.
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