Yes
Porifera
Most sessile animals are of the phylum Mollusca.
Many sponges are planktonic in their larval stage. Full grown sponges are sessile.
Porifera is the phylum that includes all sessile organisms, such as sponges. These organisms are simple, filter-feeding animals that attach themselves to substrates and do not move from place to place.
-has no tissues,organs, or an organ system. -sessile -asymmetrical -loose republic of cells ex. sponges are the most common that are found in the ocean
a hydra as a polyp is not sessile but when it grows to be a hydra it is sessile
they are sessile
Porifera (pōrĭf'ərə) [Lat.,=pore bearer], animal phylum consisting of the organisms commonly called sponge. It is the only phylum of the animal subkingdom Parazoa and represents the least evolutionarily advanced group of the animal kingdom. All adult sponges are sessile (nonmotile), and nearly all are marine; there are four families of freshwater sponges. Sponges are subdivided into three classes.
Sessile means attached. So a sessile organism is attached to a substrate.
Porifera are sponges.
phylum porifera are sponges.
Porifera is about the invertebrate animals i.e sponges