columnals
n. pl. [L. columna, column]
(ECHINODERMATA: Crinoidea)
The single row of superimposed, round or pentagonal skeletal stems.

Online Dictionary of Invertebrate Zoology. . 2005.

Look at other dictionaries:

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  • Triassic Period — Interval of geologic time, с 248–206 million years ago, that marks the beginning of the Mesozoic Era. Many new vertebrates emerged during the Triassic, heralding the major changes that were to occur in both terrestrial and marine life forms… …   Universalium

  • pentacrinite — pen.ˈtakrəˌnīt noun ( s) Etymology: New Latin Pentacrinus + English ite 1. : a fossil of the genus Pentacrinus 2. : a Jurassic crinoid with star shaped columnals …   Useful english dictionary

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