monaxonida

from The Century Dictionary.

• noun A suborder of sponges, of the order Chondrospongiæ, having monaxon spicules or being without supporting skeleton, the spicules tylostylar and usually situated radially. It includes such families as Tethyidæ, Sollasellidæ, Spirastrellidæ, Suberamatidæ, and Suberitidæ.