from The Century Dictionary and Cyclopedia

  • Central and dorsal or aboral: applied to the central ossicle of the stem of crinoids, as members of the genus Comatula.
  • n. In crinoids, a centrodorsal ossicle which unites the skeleton of the stalk with the body.
  • n. In paleont., a pentagonal plate found in many non-pedunculate crinoids (for example, Uintacrinus) at the base of the cup and probably representing an atrophied stalk.


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