What is "sertularian"

Sertularian \Ser`tu*la"ri*an\, n. (Zo["o]l.) Any species of Sertularia, or of Sertularid[ae], a family of hydroids having branched chitinous stems and simple sessile hydrothec[ae]. Also used adjectively.

n. Any species of genus (taxlink Sertularella genus noshow=1), or of family ''(taxlink Sertulariidae family noshow=1)'', hydroids having branched chitinous stems and simple sessile hydrothecae.

n. feathery colony of long-branched stems bearing stalkless paired polyps