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Hexactinellid sponges
Temporal range: Cambrian - Recent
Haeckel Hexactinellae.jpg
"Hexactinellae" from Ernst Haeckel's Kunstformen der Natur, 1904
Scientific classification
Kingdom: Animalia
Phylum: Porifera
Class: Hexactinellida
Schmidt, 1870


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.