Demospongiae is by far the largest and most diverse class of the sponges, comprising more than three-quarters of all sponge species worldwide. They are distinguished by their skeleton of spongin, which is a collagen-like protein that gives these sponges their distinctive texture. This protein is not found in any other sponge types.

Family Ancorinidae

Family Callyspongiidae

Family Chondrillidae

Family Chondropsidae

Family Clionaidae

Family Darwinellidae

Family Halisarcidae

Family Irciniidae

Family Microcionidae

Family Mycalidae

Family Tethyidae

Family Thorectidae