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Types of Sponges

Calcareous Sponge
Calcareous Sponge

All sponges in this class are strictly marine, and, while they are distributed worldwide, most are found in shallow tropical waters. Like all other sponges, they are sedentary filter feeders. All three sponge body plans are represented within class Calcarea : asconoid, syconoid, and leuconoid.

image: seawater.no
Demosponge
Demosponge

Demosponge Included are the yellow tube sponge, Aplysina fistularis, the purple vase sponge, Niphates digitalis, the red encrusting sponge, Spiratrella coccinea, and the gray rope sponge, Callyspongia sp.

image: seawater.no
Hexactinellid
Hexactinellid

After the Cretaceous, hexactinellid diversity gradually declined towards its present level. Systematics and Phylogeny Hexactinellida is divided into two subclasses, the Amphidiscophora, which have safety-pin like microscleres (amphidiscs), and the Hexasterophora, which have microscleres resembling stars or snowflakes (hexasters).

source: eol.org
image: snipview.com
Siliceous Sponge
Siliceous Sponge

The siliceous sponges form a major group of the phylum Porifera, consisting of classes Demospongiae and Hexactinellida. They are characterized by spicules made out of silicon dioxide, unlike calcareous sponges.

Stromatoporoidea
Stromatoporoidea

It is often said that Stromatoporoidea is largely composed of stem sponges, or stem demosponges, massively calcified, with closely-spaced laminar or tabular layers and roughly vertical columns. After that, things get really peculiar.

source: palaeos.com