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Definition
| Multicelled consumer with unwalled cells; develops through a series of stages and moves about during part or all of the life cycle. |
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Definition
| Segmented worm with a coelom, complete digestive system, and closed circulatory system. |
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| Of some arthropods, sensory structure on the head that detects touch and odors. |
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| Land–dwelling arthropod with four pairs of walking legs; a spider, scorpion, mite, or tick. |
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| Invertebrate with jointed legs and a hard exoskeleton that is periodically molted. |
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Definition
| Having paired structures so the right and left halves are mirror images. |
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Definition
| Mollusk with a hinged two–part shell. |
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Definition
| A concentration of nerve and sensory cells at the head end. |
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Definition
| Predatory mollusk with a closed circulatory system; moves by jet propulsion. |
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Definition
| Arthropod subgroup with specialized feeding structures (chelicerae) and no antennae. |
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Term
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Definition
| Member of the protist group most closely related to animals. |
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Term
| closed circulatory system |
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Definition
| Circulatory system in which blood flows through a continuous system of vessels, and substances are exchanged across the walls of the smallest vessels. |
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Definition
| Radially symmetrical invertebrate with two tissue layers; uses tentacles with unique stinging structures (nematocysts) to capture food. |
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Definition
| Body cavity lined with tissue derived from mesoderm. |
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Definition
| Mostly marine arthropod group with two pairs of antennae; for example, shrimp, crabs, lobsters, and barnacles. |
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Definition
| Lineage of bilateral animals in which the second opening on the embryo surface develops into a mouth. |
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Definition
| Invertebrates with hardened plates and spines embedded in the skin or body, and a water–vascular system. |
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Term
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Definition
| Outermost tissue layer of an animal embryo. |
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Term
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Definition
| Innermost tissue layer of an animal embryo. |
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Definition
| Of some invertebrates, hard external parts that muscles attach to and move. |
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Definition
| Bilaterally symmetrical invertebrate with organs but no body cavity; for example, a planarian or tapeworm. |
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Definition
| Mollusk in which the lower body is a broad “foot.” |
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Definition
| Animal that produces both eggs and sperm, either simultaneously or at different times in its life. |
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Definition
| Of soft–bodied invertebrates, a fluid–filled chamber that muscles exert force against, redistributing the fluid. |
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Definition
| Most diverse arthropod group; members have six legs, two antennae, and, in some groups, wings. |
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Definition
| General term for an animal that does not have a backbone. |
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Definition
| Preadult stage in some animal life cycles. |
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Definition
| Middle tissue layer of a three–layered animal embryo. |
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Definition
| Dramatic remodeling of body form during the transition from larva to adult. |
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Definition
| Invertebrate with a reduced coelom and a mantle; such as a bivalve, gatropod, or cephalopod. |
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Definition
| Periodic shedding of an outer body layer or part. |
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Term
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Definition
| Stinging organelle unique to cnidarians. |
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Term
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Definition
| Of cnidarians, a mesh of nerve cells with no central control organ; allows movement and other behavior. |
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Definition
| System in which blood leaves vessels and seeps through tissues before returning to the heart. |
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Definition
| The simplest modern animal known, with an asymmetrical flat body, four types of cells, and a small genome. |
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Definition
| Free–living freshwater flatworm. |
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Definition
| Lineage of bilateral animals in which the first opening on the embryo surface develops into a mouth. |
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Definition
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Definition
| Having parts arranged around a central axis, like spokes around a wheel. |
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Definition
| Unsegmented worm with a pseudocoel and a cuticle that is molted as the animal grows. |
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Definition
| Having a body composed of similar units that repeat along its length. |
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Definition
| Aquatic invertebrate that has no tissues or organs and filters food from the water. |
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| Of echinoderms, a system of fluid–filled tubes and tube feet that function in locomotion. |
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