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)