Pennatulacea sentence example

pennatulacea
  • The second section comprises the Pennatulacea or sea-pens, which are remarkable from the fact that the colony is not fixed by the base to a rock or other FIG.
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  • The calcareous skeleton of the Pennatulacea consists of scattered spicules, but in one species, Protocaulon molle, spicules are absent.
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  • Although of great interest the Pennatulacea do not form an enduring skeleton or" coral,"and need not be considered in detail in this place.
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