Name/Title
Crinoid Stone EggEntry/Object ID
2004.5.22Description
Description: Black grey and pink spots 3 inches long
Crinoids, also known as sea lilies or feather-stars, are marine animals that make up the class Crinoidea of the echinoderms (phylum Echinodermata). Crinoidea comes from the Greek word krinon, "a lily", and eidos, "form". [1] They live both in shallow water and in depths as great as 6,000 meters.[citation needed]
Crinoids are characterized by a mouth on the top surface that is surrounded by feeding arms. They have a U-shaped gut, and their anus is located next to the mouth. Although the basic echinoderm pattern of fivefold symmetry can be recognized, most crinoids have many more than five arms. Crinoids usually have a stem used to attach themselves to a substrate, but many live attached only as juveniles and become free-swimming as adults.
There are only a few hundred known modern forms, but crinoids were much more numerous both in species and numbers in the past. Some thick limestone beds dating to the mid- to late-Paleozoic are almost entirely made up of disarticulated crinoid fragments.
Rock Origin: Post-depositional
Rock Type: IgneousCollection
Suomynona Mineral CollectionAcquisition
Accession
2004.5Source or Donor
Suomynona Egg CollectionAcquisition Method
DonationLocation
Category
PermanentMoved By
Scott LonganDate
October 29, 2009Location
Shelf
BottomCabinet
Case # 7Room
Mentzer HallBuilding
Crater Rock MuseumCategory
Permanent