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A brief presentation concerning 3 major classes (subphlyla) within the phylum Arthropoda
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ARTHROPODA=>ARTHROPODA=>
• segmented invertebrates• jointed appendages• have exoskeleton• most numerous AND diverse phylum• slow growth (must shed exoskeleton… called “molting”)
• some have compound eyes (movement)• Simple eyes (ocelli)
• segmented invertebrates• jointed appendages• have exoskeleton• most numerous AND diverse phylum• slow growth (must shed exoskeleton… called “molting”)
• some have compound eyes (movement)• Simple eyes (ocelli)
CRUSTACEA=>CRUSTACEA=>• 67,000 described species• Many consumed by humans – 10,000,000 tons• A few are hermaphrodites, but most have separate sexes
• lobsters, shrimps, crabs, barnacles, pillbugs, daphnia, krill
• Mostly marine, but a few freshwater and terrestrial
• 2 body regions: cephalothorax & abdomen
• 67,000 described species• Many consumed by humans – 10,000,000 tons• A few are hermaphrodites, but most have separate sexes
• lobsters, shrimps, crabs, barnacles, pillbugs, daphnia, krill
• Mostly marine, but a few freshwater and terrestrial
• 2 body regions: cephalothorax & abdomen
CRUSTACEA=>CRUSTACEA=>• APPENDAGES: (sensing, chewing &holding, catching & defense, walking, swimming) Decapods
• APPENDAGES: (sensing, chewing &holding, catching & defense, walking, swimming) Decapods
Missouri’scrayfish species
CRUSTACEA=>CRUSTACEA=>• GREEN GLAND – regulates salt & water levels in the blood
• GREEN GLAND – regulates salt & water levels in the blood
CRUSTACEA=>CRUSTACEA=>• GREEN GLAND – regulates salt & water levels in the blood
• barnacles - sessile crustaceans
• GREEN GLAND – regulates salt & water levels in the blood
• barnacles - sessile crustaceans
hermit crabhermit crab
Caribbean Spiny LobsterCaribbean Spiny Lobster
Mammalian intellect?Mammalian intellect?
“cleaner” shrimp“cleaner” shrimp
isopod on soldierfishisopod on soldierfish
ARACHNIDA=>ARACHNIDA=>• Phylum: Arthropoda, Class: Arachnida• spiders, scorpions, mites, ticks, horseshoe crabs
• 8 legs, 4 mouthparts (2 pedipalps to hold & chew + 2 fangs (chelicera)
• Phylum: Arthropoda, Class: Arachnida• spiders, scorpions, mites, ticks, horseshoe crabs
• 8 legs, 4 mouthparts (2 pedipalps to hold & chew + 2 fangs (chelicera)
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ARACHNIDA=>ARACHNIDA=>• Phylum: Arthropoda, Class: Arachnida• “book lungs” – modified gills made of folds of tissue that hang below (surface area)
• “malpighian tubules” – excretory organs that filter wastes– water conservation!
• Phylum: Arthropoda, Class: Arachnida• “book lungs” – modified gills made of folds of tissue that hang below (surface area)
• “malpighian tubules” – excretory organs that filter wastes– water conservation!
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ARACHNIDA=>ARACHNIDA=>• TICKS & MITES – most all are parasites
– impt. in transmission of disease– Lyme Disease, Rocky Mountain Spotted Fever– mites are smaller (dust mites)
• TICKS & MITES – most all are parasites– impt. in transmission of disease– Lyme Disease, Rocky Mountain Spotted Fever– mites are smaller (dust mites)
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ARACHNIDA=>ARACHNIDA=>• SCORPIONS – long, segmented abdomen w/stinger at end– 2,000 species– pedipalps are modified into claws– few are truly dangerous to humans
• SCORPIONS – long, segmented abdomen w/stinger at end– 2,000 species– pedipalps are modified into claws– few are truly dangerous to humans
ARACHNIDA=>ARACHNIDA=>• 2 Main body Regions• Cephalothorax and abdomen• Only truly dangerous scorpion in US is Arizona Bark Scorpion
• 2 Main body Regions• Cephalothorax and abdomen• Only truly dangerous scorpion in US is Arizona Bark Scorpion
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…but this really seems a bit much.
…but this really seems a bit much.
ARACHNIDA=>ARACHNIDA=>
• SPIDERS –– “hunting” spiders have thick, hairy legs and good eyes
– “web building” spiders have long, thin legs and poor eyesight
• SPIDERS –– “hunting” spiders have thick, hairy legs and good eyes
– “web building” spiders have long, thin legs and poor eyesight
ARACHNIDA=>ARACHNIDA=>
• SPIDERS –– tend to have 8 simple eyes– “web building” spiders have long, thin legs and poor eyesight
• SPIDERS –– tend to have 8 simple eyes– “web building” spiders have long, thin legs and poor eyesight
ARACHNIDA=>ARACHNIDA=>
• HORSESHOE CRABS – are not crabs– ancient, gill-bearing arthropods– no malpighian tubules… why would they need them?
• HORSESHOE CRABS – are not crabs– ancient, gill-bearing arthropods– no malpighian tubules… why would they need them?
INSECTA=>INSECTA=>• Phylum: ArthropodaClass: Insecta• 75% of all known animal species• 1st to develop flight• 1st to truly use “communication”
– 3 types: – SONIC, VISUAL & CHEMICAL
• Phylum: ArthropodaClass: Insecta• 75% of all known animal species• 1st to develop flight• 1st to truly use “communication”
– 3 types: – SONIC, VISUAL & CHEMICAL
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INSECTA=>INSECTA=>
• 3 distinct body regions:– HEAD, THORAX & ABDOMEN
• one pair of antennae• one pair of cmpd. eyes (up to 3 simple)
• 3 distinct body regions:– HEAD, THORAX & ABDOMEN
• one pair of antennae• one pair of cmpd. eyes (up to 3 simple)
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INSECTA=>INSECTA=>• three pair of mouthparts• most have one or two pairs of wings– modified exoskeleton
• three pair of mouthparts• most have one or two pairs of wings– modified exoskeleton
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INSECTA=>INSECTA=>• RESPIRATION:
– Trachea - tubes connected to spiracles– Spiracles are observable openings on exoskeleton
• RESPIRATION:– Trachea - tubes connected to spiracles– Spiracles are observable openings on exoskeleton
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INSECTA=>INSECTA=>• RESPONSE:
– best sensory systems of all arthropods– some have receptors on bottom of feet (taste)
– compound eyes– sensitive antennae
• RESPONSE:– best sensory systems of all arthropods– some have receptors on bottom of feet (taste)
– compound eyes– sensitive antennae
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INSECTA=>INSECTA=>• DIGESTION & EXCRETION:
– after gizzard is a midgut and hindgut before the anus
– Excretion - malpighian tubules
• DIGESTION & EXCRETION:– after gizzard is a midgut and hindgut before the anus
– Excretion - malpighian tubules
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INSECTA=>INSECTA=>• METAMORPHOSIS:
– a series of changes in which young insects change into adults
– Complete metamorphosis– Incomplete metamorphosis
• METAMORPHOSIS:– a series of changes in which young insects change into adults
– Complete metamorphosis– Incomplete metamorphosis
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INSECTA=>INSECTA=>
– Complete metamorphosis– Complete metamorphosis
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INSECTA=>INSECTA=>
– Incomplete metamorphosis– Incomplete metamorphosis
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• Something new you learned
• Something you still have questions about
• Information you still Need
• Something we haven’t covered that you would like to learn about (arthropods)