Phylum Mollusca • the second largest
phylum of animals
• includes the octopus and the clam
gastropod gastro pod
stomach foot
cephalopod cephalo pod
head foot
octopus octo pus
eight foot
• univalve = “one shell”
• bivalve = “two shells”
Mollusk Shells
• mantle
• siphon
• filter feeders
Clams
Phylum Arthropoda
• highly diverse
• more species than any other animal phylum
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
• significant effect on our world
• beneficial effects
• harmful effects
Phylum Arthropoda
joint foot
arthropoda arthro poda
• jointed appendages
Phylum Arthropoda
jointed legs
antennae
• exoskeleton
• a hard, nonliving covering that supports and protects the animal
Phylum Arthropoda
Class Insecta • three body segments
thorax
head
abdomen
• three body segments
• three pairs of legs
• wings
Class Insecta
wings
• three body segments
• three pairs of legs
• wings
• compound eyes
Class Insecta
cerci
antennae
Insect Anatomy • heart
hearts artery
• heart
• excretory tubules
Insect Anatomy
hearts artery
excretory tubules
• heart
• excretory tubules
• open circulatory system
• tracheae
• spiracles
Insect Anatomy
tracheae
spiracles
insect killer
insecticide insecticide insecticide
molt • to shed
change form
metamorphosis meta metamorphosis
Metamorphosis
• incomplete metamorphosis
• complete metamorphosis
Incomplete Metamorphosis
• egg
• nymph
• adult
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.
Complete Metamorphosis
• egg
• larva
• pupa
• adult
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.
Pupa Stage • cocoon = moth
• chrysalis = butterfly
egg
larva
adult pupa
• a three-part body
• three pairs of legs
• wings
Class Insecta
Class Crustacea • a two-part body
• more than three pairs of legs
Classes Chilopoda and Diplopoda
• centipedes
• millipedes
• a long, segmented body
Chilopoda
• centipedes
• one pair of legs per segment
Diplopoda
• millipedes
• two pairs per segment
centi milli
hundred thousand
diplopoda diplo
feet double
poda
Class Arachnida • a two-part body
• four pairs of walking legs
Spin Silk • for making webs
• for wrapping up prey
• for egg cases
Echinoderms • spiny skin
• radial symmetry
• water vascular system