Spicule :: Spicule (n.) Any small calcareous or siliceous body found in the tissues of various invertebrate animals, especially in sponges and in most Alcyonaria..
Spiculiform :: Spiculiform (a.) Having the shape of a spicule.
Spiculigenous :: Spiculigenous (a.) Producing or containing spicules.
Spiculispongiae :: Spiculispongiae (n. pl.) A division of sponges including those which have independent siliceous spicules.