Term
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Definition
| Free-swimming step in the life of a cnidarian. |
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Term
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Definition
| In cnidarians, the jellylike layer between the endoderm and the ectoderm. |
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Definition
| One of many small, spikelike structures that form the skeleton of a sponge. |
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Definition
| Sessile stage in the life cycle of a cnidarian. |
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Definition
| Front end of a tapeworm; contains suckers and hooks. |
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Term
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Definition
| Type of asexual reproduction in which an outgrowth of an organism break away and develops into a new organism. |
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Term
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Definition
Sponge cell made of fused cilia surrounding a whiplike flagella; used for beating water and
filtering food. |
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Term
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Definition
| Organ of balance found in many invertebrates. |
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Term
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Definition
| Simple eyespot that detects the presence or absence of light. |
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Term
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Definition
| Protein that makes up the tough but flexible skeleton of some sponges. |
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Term
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Definition
| Inner embryonic cell layer from which the tissue nd organs of the digestive tract and other internal organs are developed. |
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Term
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Definition
| Poisonous stinger used in cnidarians for defense and catching prey. |
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Term
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Definition
| In sponges, a cluster of ball-shaped amebocytes that can grow into a new individual. |
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Term
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Definition
| Segment of a tapeworm's body that contains reproductive structures. |
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Term
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Definition
| Outer embryonic cell layer from which the nervous system, the skin, and the outer associated body covering are derived in animal development. |
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Term
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Definition
| Wandering cell in sponges. |
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Term
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Definition
| Digestive sac with a single opening to the outside from which food enters and waste leaves. |
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Term
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Definition
| System in which blood is pumped from the heart through vessels and open spaces. |
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Term
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Definition
| Muscular structure in the back of the mouth; connects the mouth with the rest of the digestive tract. |
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Term
| Closed Circulatory System |
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Definition
| System in which blood moves only through blood vessels. |
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Term
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Definition
| Excretory organ that removs nitrogen-containing wastes from the blood; found in many invertebrates. |
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Term
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Definition
| Bundle of nerves and neural connections that control the nervous system. |
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Term
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Definition
| Widening in the digestive tract for the temporary storage of food. |
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Term
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Definition
| Organ of balance found in many invertebrates. |
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Term
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Definition
| In mollusks, protective structure formed by glands in the mantle. |
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Term
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Definition
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Term
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Definition
| Group of nerve cells that extend along the length of the body. |
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Term
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Definition
| Free-swimming larva stage of a mollusk. |
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Term
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Definition
| In an annelid, structure that pumps blood, thus functionign as a miniture heart. |
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Term
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Definition
| In a mollusk, the muscular structure that usually contains the mouth. |
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Term
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Definition
| The feeding structure in the mouth of many mollusks. |
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Term
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Definition
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Term
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Definition
| Suction-cuplike structure connected to the water vascular system of an echinoderm. |
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Term
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Definition
| Thin delicate layer of tissue that covers the internal organs of mollusk. |
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Term
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Definition
| Portion of digestive tract where food is ground into small, absorable particles. |
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Term
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Definition
| In annelids, a muscle that surrounds the longitudinal muscle, lengthening the segments as it contracts. |
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Term
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Definition
| Specialized cell capble of changing color. |
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Term
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Definition
| Material that forms a protective sheath around an axon; white fatty substance that surrounds many vertebrate nerve cells. |
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Term
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Definition
| Tube through which water is forced out. |
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Term
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Definition
| In echinoderms, a network of fluid-filled tubes and appendages used for many purposes. |
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Term
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Definition
| Dividing wall or membrane. |
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Term
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Definition
| In annelids, a muscle that runs along the length of the body, shortening the segments as it contracts. |
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Term
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Definition
| In an annelid, the structure that secretes a ring of mucus into which eggs and sperm are released. |
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Term
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Definition
| In arthropods, the body segment containing most of the internal organs. |
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Term
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Definition
| Process of shedding an exterior layer or exoskeleton to allow for renewal growth. |
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Term
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Definition
| Process of changing form and shape. |
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Term
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Definition
| In chelicerates, body segment formed from fused head and thorax; carries the legs. |
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Term
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Definition
| Structual carbohydrate that is the main component of arthopod exoskeleton reinforces the cell walls of fungi; also found in insect skeletons. |
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Term
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Definition
| Featherlike respiratory organ of many aquatic species; used to obtain oxygen from the water. |
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Term
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Definition
| Respiratory organ of most spiders made of numerous layers of tissue that resemble the pages of book. |
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Term
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Definition
| Air-conducting passage for the diffusion of oxygen. |
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Term
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Definition
| Respiratory organ of some marine arthopods. |
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Term
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Definition
| In animals, the female reproductive gland that produces eggs and female hormones; in flowering plants, the structure that contains the egg cells of a flower. |
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Term
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Definition
| Unique specializd mouthpart of celicerates used for grasping and crushing. |
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Term
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Definition
| Specialized leglike appendage of chelicerates that are used for grasping, sensing, and fertilizing. |
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Term
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Definition
| In arthropods, specialized mouthpart used for biting. |
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Term
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Definition
| The tracheal tube, connects pores in the skin. |
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Term
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Definition
| Male reproductive gland that produces sperm and male hormones. |
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Term
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Definition
| Structure that excretes nirogenous wastes; found in many arthropods. |
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