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Chapter 33 biology Vocabulary
Terms in this set (44)
A digestive tract consisting of a tube running between a mouth and an anus.
Shelled cephalopod animal that was the dominant invertebrate predator for millions of years ending with the mass extinctions at the end of the Cretaceous period.
An amoebalike cell that moves by pseudopodia, found in most animals; depending on the species, may digest and distribute food, dispose of wastes, form skeletal fibers, fight infections, and change into other cell types.
The animal class that includes scorpions, spiders, ticks, and mites.
Segmented coelomate with exoskeletons and jointed appendages.
Organs of gas exchange in spiders, consisting of stacked plates contained in an internal chamber.
Clawlike feeding appendages characteristic of the chelicerate group. Singular, chelicera.
The animal phylum that includes horseshoe crabs, scorpions, ticks, spiders, and an extinct group called the eurypterids. All have chelicerae.
Member of the animal phylum that includes horseshoe crabs, scorpions, ticks, spiders, and an extinct group called the eurypterids. All have chelicerae.
A flagellated feeding cell found in sponges. Also called a collar cell, it has a collarlike ring that traps food particles around the base of its flagellum.
A specialized cell for which the phylum Cnidaria is named; consists of a capsule containing a fine coiled thread, which, when discharged, functions in defense and prey capture.
The transformation of a larva into an adult that looks very different, and often functions very differently in its environment, than the larva.
A group of small crustaceans that are important members of marine and freshwater plankton communities.
A member of a major arthropod phylum that includes lobsters, crayfish, crabs, shrimps, and barnacles.
The exoskeleton of an arthropod, consisting of layers of protein and chitin that are variously modified for different functions.
A relatively large group of crustaceans that includes lobsters, crayfish, crabs, and shrimp.
Sessile or slow-moving animals that include sea stars, sea urchins, brittle stars, crinoids, and basket stars.
Mainly marine and freshwater, extinct, chelicerates. These predators, also called water scorpions, ranged up to 3 meters long.
A hard encasement on the surface of an animal, such as the shells of mollusks or the cuticles of arthropods, that provides protection and points of attachment for muscles.
An extensive pouch that serves as the site of extracellular digestion and a passageway to disperse materials throughout most of an animal's body.
An individual that functions as both male and female in sexual reproduction by producing both sperm and eggs.
A type of development in certain insects, such as grasshoppers, in which the larvae resemble adults but are smaller and have different body proportions. The animal goes through a series of molts, each time looking more like an adult, until it reaches full size.
An animal without a backbone; invertebrates make up 95% of animal species.
One of the largest groups of crustaceans, primarily marine, but including pill bugs common under logs and moist vegetation next to the ground.
Jawlike structures found in uniramians and crustaceans.
A heavy fold of tissue in mollusks that drapes over the visceral mass and may secrete a shell.
A water-filled chamber that houses the gills, anus, and excretory pores of a mollusk.
The floating, flattened, mouth-down version of the cnidarian body plan. The alternate form is the polyp.
A gelatinous region between the two layers of cells of a sponge.
A process in arthropods in which the exoskeleton is shed at intervals to allow growth by the secretion of a larger exoskeleton.
Stinging component of cnidocytes.
open circulatory system
An arrangement of internal transport in which blood bathes the organs directly and there is no distinction between blood and interstitial fluid.
A large opening in a sponge that connects the spongocoel to the environment.
A type of reproduction in which females produce offspring from unfertilized eggs.
Carnivore that preys on smaller animals or feed on dead animals.
The sessile variant of the cnidarian body plan. The alternate form is the medusa.
Invertebrate organs which function similar to kidneys.
A straplike rasping organ used by many mollusks during feeding.
The central cavity of a sponge.
Animals that feed by straining suspended matter and food particles from water, typically by passing the water over a specialized filtering structure. Also called filter feeders.
A characteristic of gastropods in which the body rotates during development.
Extensions of a network of hydraulic canals that function in locomotion, gas exchange, and feeding.
One of the three main parts of a mollusk, it contains most of the internal organs.
water vascular system
A network of hydraulic canals unique to echinoderms that branches into extensions called tube feet, which function in locomotion, feeding, and gas exchange.
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