Poriferans

Poriferans do not have mouth unlike other animals. Instead, their bodies have tiny holes designed to allow water and food to come in. Hence, they are also classified as filter feeders. They feed on bacteria and other suspended particles in water. Some species are carnivorous, feeding on animals like small crustaceans. Their bodies are capable of regenerating when some parts are damaged or are broken off. Their bodies are composed of silica and calcium carbonate.

Poriferans include the different kinds of sponge. Sponges are invertebrates that are found in deep bodies of water like the sea and ocean. They appear in different colors, sizes, and shapes. They are often mistaken to be plants, but they are animals. They are motile, or capable of movement, during the early stage of development (larval form). They settle and attach themselves to hard surfaces underwater in their adult stage. They remain sessile (nonmoving) and stay only in one place.