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An animal without a backbone. Invertebrates make up 95% of animal species.
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An aquatic animal, such as a sponge, clam, or baleen whale, that feeds by sifting small organisms or food particles from the water.
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U1L08 Invertebrates

AP Biology

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An animal without a backbone. Invertebrates make up 95% of animal species. invertebrate
An aquatic animal, such as a sponge, clam, or baleen whale, that feeds by sifting small organisms or food particles from the water. suspension feeder
A large opening in a sponge that connects the spongocoel to the environment. osculum
A gelatinous region between the two layers of cells of a sponge. mesohyl
An individual that functions as both male and female in sexual reproduction by producing both sperm and eggs. hermaphrodite
The sessile variant of the cnidarian body plan. The alternate form is the medusa. polyp
A specialized cell unique to the phylum Cnidaria; contains a capsule-like organelle housing a coiled thread that, when discharged, explodes outward and functions in prey capture or defense. cnidocyte
An excretory system, such as the flame bulb system of flatworms, consisting of a network of tubules lacking internal openings. protonephridium
A form of asexual reproduction in which females produce offspring from unfertilized eggs. parthenogenesis
A hard encasement on the surface of an animal, such as the shell of a mollusc or the cuticle of an arthropod, that provides protection and points of attachment for muscles. exoskeleton
In some lophotrochozoan animals, including brachiopods, a crown of ciliated tentacles that surround the mouth and function in feeding. lophophore
One of the three main parts of a mollusc; the part containing most of the internal organs.See also foot, mantle. visceral mass
A water-filled chamber that houses the gills, anus, and excretory pores of a mollusc. mantle cavity
In gastropods, a developmental process in which the visceral mass rotates up to 180°, causing the animal's anus and mantle cavity to be positioned above its head. torsion
A waxy covering on the surface of stems and leaves that prevents desiccation in terrestrial plants. cuticle
A segmented ecdysozoan with a hard exoskeleton and jointed appendages. Familiar examples include insects, spiders, millipedes, and crabs. arthropod
An arthropod that has chelicerae and a body divided into a cephalothorax and an abdomen. Living cheliceriforms include sea spiders, horseshoe crabs, scorpions, ticks, and spiders. cheliceriform
An insect or closely related wingless, six-legged arthropod. hexapod
One of a pair of clawlike feeding appendages characteristic of chelicerates. chelicera
A member of a major arthropod group, the chelicerates. Arachnids include spiders, scorpions, ticks, and mites. arachnid
One of a pair of jaw-like feeding appendages found in myriapods, hexapods, and crustaceans. mandible
A member of one of the largest groups of crustaceans, which includes terrestrial, freshwater, and marine species. Among the terrestrial isopods are the pill bugs, or wood lice. isopod
A slow-moving or sessile marine deuterostome with a water vascular system and, in larvae, bilateral symmetry. Echinoderms include sea stars, brittle stars, sea urchins, feather stars, and sea cucumbers. echinoderm
A network of hydraulic canals unique to echinoderms that branches into extensions called tube feet, which function in locomotion and feeding. water vascular system
Created by: jtaylor422
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