sea pen

noun
any of several colonial coelenterates of the genus Pennatula and related genera, having the shape of a fleshy feather.

Origin:
1755–65

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World English Dictionary
sea pen
 
n
any of various anthozoan coelenterates of the genus Pennatula and related genera, forming fleshy feather-like colonies in warm seas: order Pennatulacea

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

sea pen

any of the 300 species of the order Pennatulacea, colonial invertebrate marine animals of the class Anthozoa (phylum Cnidaria). The name sea pen derives from their resemblance to quill pens. They occur in shallow and deep waters from polar seas to the tropics.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The yellowest light came from a sea pen, and this definitely merits further investigation.
Interactions between a sea pen and seven of its predators.
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