Name/Title
Crinoid (stem)Entry/Object ID
2011.57.75Description
Description: Phylum: Echinodermata
Class: Crinoidea
Common Name: Crinoid Stems
Age: Mississippian
Location: Unknown
Description: Conical, crooked and segmented banding. Color is light and dark gray.
Physical Characteristics:
Crinoids 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] Sea lilies refer to the crinoids which, in their adult form, are attached to the sea bottom by a stalk.[2] Feather stars[3] or comatulids[4] refer to the unstalked forms.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.
Kingdom: Animalia (Animals)
Class: Crinoidea
Phylum: EchinodermataCollection
Museum Collection of FossilsAcquisition
Accession
2011.57Source or Donor
Museum Collection of FossilsAcquisition Method
Long-term LoanDimensions
Width
7/8 inDepth
3/4 inLength
2-1/8 inLocation
Location
Container
LeftDrawer
2nd ShelfShelf
RightCabinet
Case # 51Wall
NorthRoom
Delmar Smith HallBuilding
Crater Rock MuseumCategory
Permanent
