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Kentucky Tholocrinus Crinoid #32

$100.00

  • Genuine Kentucky Crinoid Fossil
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Description

Kentucky Tholocrinus Crinoid

  • Tholocrinus spinosus
  • Mississippian Age (299 – 359 Million Years Old)
  • Glen Dean Formation
  • Leitchfield, Kentucky
  • The crinoid measures approximately  .87″ – .97″ long and the matrix measures approximately  3.81″ wide
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Crinoid, any marine invertebrate of the class Crinoidea (phylum Echinodermata) usually possessing a somewhat cup-shaped body and five or more flexible and active arms. The arms, edged with feathery projections (pinnules), contain the reproductive organs and carry numerous tube feet with sensory functions. The tentacles have open grooves, along which cilia (minute, hairlike projections) sweep food particles toward the mouth.

The distinctive limy tests (internal skeletons of calcium carbonate) of crinoids make the thousands of extinct species (together with extinct echinoderms of similar form) important Paleozoic index fossils. About 700 living species are known, mainly from deep waters.

Kentucky Tholocrinus Crinoid