the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [noun] > class Hydrozoa > order Campanulariae > member of family Sertulariidae > having star-like forms > star-shaped projection on (1)
Zoology. A star-shaped projection on the surface of a coralline; also, a star-shaped sponge-spicule.