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bryozoan any of a phylum (Bryozoa) of sessile invertebrate animals that uses tentacles to remove food particles from water.
coelenterate any of numerous invertebrate animals that have tentacles around the oral opening and a single internal cavity for various bodily functions, such as the jellyfishes, anemones, and corals.
insect any of a group of small invertebrate animals that have segmented bodies, three pairs of legs, and usually one or two sets of wings. An insect's body is segmented into head, thorax, and abdomen. [1/3 definitions]
invertebrate having to do with invertebrate animals. [2/3 definitions]
liver1 any of various similar organs in invertebrate animals. [1/3 definitions]
mollusk a member of a group of invertebrate animals that live in water. Most kinds of mollusks live in the ocean and have soft bodies covered by a shell. Snails, clams, squid, and octopuses are examples of mollusks.
Ordovician of, relating to, or designating the geological period between the Cambrian and Silurian of the Paleozoic Era, from approximately 500 million to 440 million years ago, when marine invertebrate animals were abundant. [1/2 definitions]
polyp an aquatic invertebrate, usu. sedentary or fixed in place, with a tubular body and a mouth surrounded by tentacles. [1/2 definitions]
scallop a small invertebrate animal that lives in the ocean. A scallop lives inside of two shells that are attached to each other with a kind of hinge. These rounded, ribbed shells protect the scallop's soft body. The hinged shells can be opened and closed using a large muscle of the scallop. People sometimes eat this muscle. Scallops are mollusks and are closely related to clams and mussels. [1/4 definitions]
shellfish an aquatic invertebrate animal that has a shell, esp. an edible animal such as a clam, oyster, or lobster.
tooth a similar object in invertebrate animals. [1/5 definitions]
urchin a marine invertebrate having movable projecting spines on a roundish body; sea urchin. [1/2 definitions]
zoophyte any of various invertebrate animals that resemble a plant, such as a coral or sponge.