fire coral

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fire coral

n.
Any of various brownish-yellow reef-building colonial hydrozoans of the genus Millepora having an encrusting or branching calcareous skeleton and nematocysts that release stinging barbs. Also called millepore.

[From the painful stings.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Furthermore, mosaicism has been found to amplify the standing genetic variation in populations of red algae, seagrasses, sponges, and fire corals (Milleporidae) (Santelices et al., 1995; Blanquer and Uriz, 2011; Reusch and Bostrom, 2011; Schweinsberg et al., 2017), which could be critical in reef corals suffering from recent population bottlenecks (Baums, 2008).
It has all kinds of hard corals; amongst the most beautiful are table corals, fire corals and brain corals.
Less affected were fire corals of the genus Millepora (Figure 1(a)), due to the erected and branching growth form and the limited contact area between coral tissue and mucus webs.
Fouled colonies were those showing fouling organisms such as algae or fire corals colonizing the blade.
In many instances they do this in conjunction with the related fire corals, (Millepora, Stylaster), which are not corals at all, but hydrozoans.