Class Hyalospongiae is a group of sponges that are characterized by their glass-like or transparent appearance. These sponges are also commonly known as glass sponges, and belong to the phylum Porifera. There are several different synonyms for Class Hyalospongiae, including Hexactinellida, which refers to the six-rayed spicules that make up the sponge's skeleton. Other synonyms include Dictyospongiae, which refers to the sponge's network-like internal structure, and Lyssacinosa, which refers to the sponge's ability to dissolve organic matter. Regardless of the terminology used, these sponges are fascinating creatures that inhabit deep ocean waters and play an important role in the marine ecosystem.