Hexactinosa

Hexactinosa

[hek‚sak·tə′nō·sə]
(invertebrate zoology)
An order of sponges in the subclass Hexasterophora; parenchymal megascleres form a rigid framework and consist of simple hexactins.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.