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34 Cards in this Set
- Front
- Back
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Describe arthropods. [3]
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segmented body, tough exoskeleton, and jointed appendages
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What happens when arthropods outgrow their exoskeletons?
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molting
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what is an exoskeleton?
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tough external covering
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what is a carbohydrate that is contained in exoskeletons
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chitin
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what is a structure that extends from the body wall?
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appendage
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what are branching structures that terrestrial arthropods breathe through?
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tracheal tubes
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what are book lungs?
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organs that have layers of stacked respiratory tissues
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what is a saclike organ that extracts waste from blood and adds to feces?
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malphigian tubes
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what kind of circulatory system do arhtorpods have?
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open
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T or F: all arthropods have brains
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true
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how are arthropods classified?
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number and structure of body segments and appendages
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what are the chewing mouthparts of crustaceans called?
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mandibles
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what are the mouthparts of chelicerates called?
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chelicerae
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what belongs to the subphylum chelicerate?
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spiders, scorpions, horseshoe crabs, and ticks
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what belongs to the subphylum unimaria?
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centipedes, millipedes, and insects
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What subphylum has a jaw?
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unimaria
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what is formed by the fusion of head and thorax?
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cephalothorax
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what lies just behind the head and houses most internal organs?
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thorax
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what is the posterior part of the arthropod body?
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abdomen
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what is the part of the exoskeleton that covers the cephalothorax?
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carapace
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what are legs that bear claws modified to do stuff?
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chelipeds
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what are flipperlike appendages used for arthropod-swimming?
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swimmerets
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what are organs that contain silk glands?
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spinnerets
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what are the 3 parts of an insect?
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head, thorax, abdomen
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how many pairs of legs are? attached to the insect's thorax?
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3
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what do ants, bees, termites, etc. form?
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societies
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what is metamorphosis in which the immature forms of insects look like adults?
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incomplete metamorphosis
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what is a nymph?
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immature form of an insect
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what is the stage in which an insect changes from larva to adult?
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pupa
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what are specific chemical messengers that affect behavior or development of individuals of same species
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pheromones
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what is a group of individuals that changes from level to level in a society?
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caste
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how are echinoderms characterized? [4]
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spiny skin, internal skeleton, water-vascular system, and suction cups called tube feet
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what are 4 classes of echinoderms?
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sea urchins/sand dollars; brittle stars; sea cucumbers; sea lilies and feather stars
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what is a sievelike structure that is the opening of the water vascular system?
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madreporite
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