Amphidiscosida (sometimes spelled Amphidiscosa)[2][3] is an order of hexactinellids (glass sponges).

The Amphidiscosida are commonly regarded as the only living sponges in the subclass Amphidiscophora.

[4][5] As the name implies, the Amphidiscosida are characterized by a special type of microsclere (microscopic spicules): amphidiscs.

Amphidiscs are rod-like spicules with an equal-sized umbel (a whorl of backswept hooks) at each end.

[2] Amphidiscosids are often covered with prostalia (bristles), formed by single-rayed spicules.