Homoscleromorpha are a class of Sponges, exclusively marine, that inhabit spaces with very little light and predominantly near the coast (although there are species that we can find in deep waters). Generally they are species of an encrusting nature, which we can find predominantly in caves.
Until the 1980s, Homoscleromorpha were included in the Demospongiae class, but molecular studies have allowed the creation of an independent class, since not only do they differ molecularly from the Demospongiae, but they possess unique cellular morphological characteristics that differentiate them from the Demospongiae.
At present, 117 species belonging to the Homoscleromorpha class are known, which are grouped into 9 genera. The majority of the species lack spicules, but those species that do have them are of a siliceous nature. Their bodies adopt a leuconoid type morphology, that is, they have a reduced atrial cavity, and therefore the appearance of these sponges is considerably solid. They can have more than one opening for the exit of filtered water.