What is "pennatula"

Pennatula \Pen*nat"u*la\, n.; pl. L. Pennatul[ae], E. Pennatulas. [NL., fr. L. penna a feather.] (Zo["o]l.) Any one of numerous species of Pennatula, Pteroides, and allied genera of Alcyonaria, having a featherlike form; a sea-pen. The zooids are situated along one edge of the side branches.

n. (context zoology English) Any of numerous species of (taxlink Pennatula genus), (taxlink Pteroides genus), and allied genus of Alcyonaria, having a feather-like form; a sea pen.