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Hexactinellid sponges are sponges with a skeleton made of four- and/or six-pointed silaceous spicules, often referred to as glass sponges. They are usually classified along with other sponges, but some researchers consider them sufficiently distinct to deserve their own phylum, Symplasma.

Hexactinellid sponges
Temporal range: Cambrian - Recent
Haeckel Hexactinellae.jpg
"Hexactinellae" from Ernst Haeckel's Kunstformen der Natur, 1904
Scientific classification
Kingdom:
Phylum:
Class:
Hexactinellida

Schmidt, 1870
Subclasses

Amphidiscophora
Hexasterophora