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23 Cards in this Set
- Front
- Back
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75% of all species of animals are members of what phylum?
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Arthopoda
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What are 2 distingishing characteristics of Arthopods?
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Have jointed appendages and an exoskeleton that contains chitin.
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What is chitin made of?
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Modified polysaccharide that contains nitrogen.
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What are the exoskeleton of most arthopods made of?
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Chitin, protein & wax.
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Describe a usual exoskeleton. What is the function of the exoskeleton?
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Thin & flexible, but can be thick & rigid found on the outside and provides protection. it is non-living and therefore does not grow.
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Describe molting.
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Since the exoskeleton is non-living the arthropod must shed the exoskeleton in order to grow larger. Each period between molts is called an instar.
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Describe the eyes of arthropods.
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Most arthropods have eyes. Some have simple eyes, others have complex eyes & some have both.
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Define simple eyes.
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May or may not fucntion for vision.
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Define complex eyes.
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Function for vision and are composed of many photoreceptor units called ommatidia.
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What are ommatidia?
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Photorecptor units in complex eyes of arthropods.
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What does metamorphosis mean?
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Means change in body form.
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Arthropods of parasites of medical importance belong to what 2 classes?
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Insecta
Arachnida |
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External features of adult insects.
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1 pair of antennae
3 pairs of legs 3 body regions the only invertebrates with wings 1 pair of mandibles 1 pair of maxillae |
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What are the 3 body regions of insects?
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Head, thorax and abdomen.
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What are the function of mandibles & maxillae?
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function for chewing and/or sucking food.
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what type of life cycle do insects that are parasites of medical importance undergo?
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Either gradual metamorphosis or complete metamorphosis.
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Descibe gradual metamorphosis.
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Adult, egg, nymph. Nymphssomewhat resembe the adults, but their bodies are out of proportion. Nymphs look more & more like the adults with each instar.
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What 2 types of insects of medical importance have a gradual metamorphosis Life Cycle?
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Lice & True Bugs have this type Life Cycle.
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Describe complete metamorphosis.
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Adult, egg, larva, pupa, adult. Larvae do not resemble the adults. Each molt they become larger. Pupae do not feed & are quiescent. Only 1 instar of the pupa stage. X instars of nymphs & larvae.
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What types of insects of medical importance have a complete metamorphosis life cycle?
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Fleas & flies, including mosquitoes have this type Life Cycle.
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Describe the external features of Adult Arachnids.
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lack antennae & have 4 pairs of legs. 3 body regions are fused (maybe oval shaped) lack mandibles & maxillae but have chelicerae & pedipalps.
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Chelicerae & pedipalps are what?
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Appendages that are paired & located anteriorly on Arachnids used for feeding
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How is a new exoskeleton generated after the old one has molted?
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The cuticle made up of several layers of protein, lipids & polysaccharides is secreted by the underlying hypodermis.
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