arthropoda
TRANSCRIPT
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Phylum ARTHROPODA
The most successful animal group to have ever lived
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Phylum Arthropoda
ARTHRO (joint) + PODA (foot) have “jointed feet”
jointed appendages (legs & other outgrowths)
chitinous exoskeleton for protection, but restricts size MOLTING
bilateral symmetry, triploblastic, coelomate
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Phylum Arthropoda
body segmented forming specific body regions
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Structure and Function
Feeding – complete digestive tract Internal transport – open circulatory
system w/ dorsal heart Respiration – varied Excretion – varied Nervous system – brain + ventral nerve
cord; sense organs (sight, smell, hearing, balance, taste, touch, etc.)
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Structure and Function
Reproduction – sexes separate
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Taxonomy of Phylum Arthropoda Subphylum TRILOBITA
Subphylum CHELICERATA
Subphylum CRUSTACEA
Subphylum UNIRAMIA Class CHILOPODA Class DIPLOPODA Class INSECTA
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Subphylum TRILOBITA
early arthropods all extinct pronounced segmentation little or no variation in appendages
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Subphylum CHELICERATA
CHEILOS (lips) + CHEIR (arm) cepalothorax & abdomen no antennae 6 pairs of appendages:
chelicerae – claw-like, for feeding (pincers or fangs)
pedipalps – sense chemicals, touch; for holding food, sperm transfer in males
walking legs – 4 pairs
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Subphylum CHELICERATA
respiration: book lungs e.g. spider scorprion tick & mite horseshoe crab
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Subphylum CRUSTACEA two pairs of antennae cephalothorax & abdomen most marine, some freshwater; few
terrestrial e.g. lobster, crab, shrimp
waterflea, barnacle, crayfish
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Structure & Function of the Crayfish
paired appendages: antennules, antennae, maxillipeds, chelipeds, walking legs, swimmerets, uropods capable of self-amputation & regeneration
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Structure & Function of the Crayfish excretion: green glands circulation & respiration: heart
arteries sinuses gills sense organs: compound eyes,
antennules, antennae, statocyst reproduction: dioecious; fertilized eggs
attach to female’s swimmerets… young, too (for a while)
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Subphylum UNIRAMIA
one pair of antennae uniramous (unbranched)
jaw-like mandibles for feeding compound eyes
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Subphylum UNIRAMIA
Class Chilopoda • w/ head & worm-like body made up of
similar segments • segments have one pair of legs • head w/ one pair of antennae & various
mouthparts • e.g. centipede (“hundred legger”)
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Centipede
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Subphylum UNIRAMIA
Class Diplodopa • distinct head w/ worm like body • two pairs of legs per segment • head w/ one pair of antennae &
mouthparts • e.g. millipede (“thousand legger”)
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Millipede
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Subphylum UNIRAMIA
Class Insecta • most successful class most terrestrial,
capable of flight • body regions: head, thorax & abdomen • pair of antennae, several mouthparts,
3 pairs of walking legs + wings • variations: mouthparts, body form, legs
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Subphylum UNIRAMIA
• respiration: spiracles opening into tracheae
• excretion: malpighian tubules • metamorphosis:
incomplete (e.g. grasshopper, cockroach)
egg nymph adult complete (e.g. butterfly, bee, fly, beetle)
egg larva pupa adult
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Incomplete Metamorphosis
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Complete Metamorphosis
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And the famousest of them all…