Phylum Mollusca - WCA Life...
Transcript of Phylum Mollusca - WCA Life...
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Phylum Mollusca • the second largest
phylum of animals
• includes the octopus and the clam
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gastropod gastro pod
stomach foot
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cephalopod cephalo pod
head foot
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octopus octo pus
eight foot
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• univalve = “one shell”
• bivalve = “two shells”
Mollusk Shells
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• mantle
• siphon
• filter feeders
Clams
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Phylum Arthropoda
• highly diverse
• more species than any other animal phylum
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mollusks 75,000 species
worms 30,000 species
cnidarians 10,000 species
sponges 5,000
species
other invertebrates 8,000 species
chordates 40,000 species
echinoderms 5,500
species
arthropods
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• significant effect on our world
• beneficial effects
• harmful effects
Phylum Arthropoda
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joint foot
arthropoda arthro poda
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• jointed appendages
Phylum Arthropoda
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jointed legs
antennae
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• exoskeleton
• a hard, nonliving covering that supports and protects the animal
Phylum Arthropoda
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Class Insecta • three body segments
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thorax
head
abdomen
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• three body segments
• three pairs of legs
• wings
Class Insecta
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wings
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• three body segments
• three pairs of legs
• wings
• compound eyes
Class Insecta
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cerci
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antennae
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Insect Anatomy • heart
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hearts artery
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• heart
• excretory tubules
Insect Anatomy
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hearts artery
excretory tubules
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• heart
• excretory tubules
• open circulatory system
• tracheae
• spiracles
Insect Anatomy
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tracheae
spiracles
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insect killer
insecticide insecticide insecticide
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molt • to shed
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change form
metamorphosis meta metamorphosis
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Metamorphosis
• incomplete metamorphosis
• complete metamorphosis
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Incomplete Metamorphosis
• egg
• nymph
• adult
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egg
nymph
adult
A nymph is an immature stage that looks just like the adult, but is smaller and isn’t
able to reproduce yet.
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Complete Metamorphosis
• egg
• larva
• pupa
• adult
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egg
larva
pupa
A larva is an immature stage of complete metamorphosis.
It is usually a very active stage.
The pupa stage is the resting stage of complete
metamorphosis.
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Pupa Stage • cocoon = moth
• chrysalis = butterfly
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egg
larva
adult pupa
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• a three-part body
• three pairs of legs
• wings
Class Insecta
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Class Crustacea • a two-part body
• more than three pairs of legs
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Classes Chilopoda and Diplopoda
• centipedes
• millipedes
• a long, segmented body
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Chilopoda
• centipedes
• one pair of legs per segment
Diplopoda
• millipedes
• two pairs per segment
centi milli
hundred thousand
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diplopoda diplo
feet double
poda
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Class Arachnida • a two-part body
• four pairs of walking legs
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Spin Silk • for making webs
• for wrapping up prey
• for egg cases
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Echinoderms • spiny skin
• radial symmetry
• water vascular system