Aquatic, sessile invertebrates that have no true tissues or organs that make up the phylum Porifera.
Describes an organism that remains attached to a surface for its entire life and does not move.
Collar cells; Flagellate cells that line the cavities of a sponge and draw water into the sponge by beating their flagella.
A pore in the body wall of a sponge.
An opening at the top of the sponge; where water leaves in a sponge.
Tough, flexible protein fibers; what some sponge skeletons are made of.
Tiny, hard particles of calcium carbonate or silicon dioxide that are often shaped like spikes; what some sponge skeletons are made of.
A method of feeding in which an aquatic animal traps organic material that is floating in the surrounding water; how sponges feed.
Cells which crawl about within the body wall of a sponge that distribute nutrients throughout the body.
Asexually produced internal buds that some freshwater sponges create during poor conditions. Food-filled balls of amoebocytes surrounded by a protective coat made of organic material and spicules that can survive harsh conditions.
The regrowth of missing cells, tissues, or organs.
Organisms that produce both eggs and sperm.
Bell-shaped body form of a cnidarian that is specialized for swimming.
Vase-shaped body form of a cnidarian that is specialized for a sessile existence.
The outer cell layer of a cnidarian.
The inner cell layer of a cnidarian.
A jellylike material between the epidermis and gastrodermis of a cnidarian.
The hollow gut in the center of the body of a cnidarian which has a single opening, or mouth.
Numerous flexible extensions surrounding the mouth of a cnidarian.
Specialized cells used for defense and capturing prey.
A cnidocyte organelle which has a long filament coiled up inside it.
A diffuse web of interconnected nerve cells of a cnidarian.
A ciliated larva that develops from the blastula of a scyphozoan.
Large, rocklike formations built up from anthozoan polyps.
Cells of ctenophores which secrete a sticky substance that binds to their prey.
A sensory structure at one end of a ctenophore's body that enables ctenophores to sense their orientation in the water.
The production of light by means of a chemical reaction.