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Animal Classification
Animals
Animals are spilt into two major
groups:
Vertebrates
Invertebrates
Invertebrates
 These are animals without a backbone
 There are eight groups of invertebrates
 Sponges
 Cnidarians
 Flatworms
 Roundworms
 Annelids
 Molluscs
 Arthropods
 Echinoderms
Sponges
 Live in water
 5,000- 10,000 known
species
 Eats by sweeping water
into pores
 Simplest animal- No
nervous system, tissues
or organs
 Reproduce sexually and
asexually
 Sessile – stay in one place
 Asymmetrical symmetry
Cnidarians
 Live in water
 Approx. 9,000
known species
 Tentacles have
stinging cells
 Simple muscles
and nerves
 Digestive tract
with one entrance
and exit
 Radial symmetry
Flatworms
 Lives on moist land,
water and parasitic
 Approx. 12,000 known
species
 Simple nervous system
 Digestive tract with one
entrance and exit
 Reproduce sexually and
asexually
 Simplest bilateral
symmetrical animal
Roundworms
 Lives on moist land,
water, and in a host
 Approx. 20,000
known species
 Simple nervous
system
 Simple body plan
 Complete digestive
tract with two ends
 Bilateral symmetry
Annelids
 Lives on moist land
and in water
 Approx. 20,000
known species
 Segmented body
 Well-developed organ
systems
 Complete digestive
tract with two ends
 Bilateral symmetry
Molluscs
 Lives on land and
in water
 Approx. 100,000
known species
 Most have a shell
 Muscular “foot”
used to slide, dig
or jump
 Complete digestive
tract with two ends
 Bilateral symmetry
Arthropods
Lives on land and in water
Most abundant phylum > 1 million
Segmented bodies
Hard exoskeleton
Well-developed nervous system
Complete digestive tract with two
ends
 Bilateral Symmetry
 There are four group of arthropods:






Centipedes & Millipedes
Insects
Crustaceans Arachnids
Arthropods - Arachnid
Have four pairs of
legs.
Have bodies
divided into two
sections
Arthropods – Centipedes
& Millipedes
Have long thin
bodies and pairs of
legs on each of
their many body
sections
Arthropods - Crustacean
Have five-seven
pairs of legs
First pair often
used as pincers
Bodies covered
in shell
Arthropods - Insects
Have three pairs of
legs
Bodies divided into
three sections
Often have wings
Echinoderms
 Live in the water
(Ocean)
 Approx. 6,000 known
species
 Endoskeleton usually
covered with spines
 Complete digestive
tract with two ends
 Radial Symmetry
Vertebrates
These are animals with a backbone.
There are five groups of vertebrates:
Fish
Amphibians
Reptiles
Birds
Mammals
Fish
 Lives in water
 30,000-40,000
known species
 Gills for breathing
 Fins
 Scales on body
 Ectotherms
 Bilateral
Symmetry
Amphibians
 Live in water and on land.
 Approx.7000 known
species
 Breath with lungs and
through skin
 Metamorphosis (young
live in water, adults live on
land)
 Ectotherm
 Bilateral Symmetry
Reptiles






Live on land
Approx.10,000 known species
Thick skin
Covered with scales
Lungs
Lays eggs with
shells
 Ectotherm
 Bilateral Symmetry
Birds
 Live on land
 Approx.10,000 know
species
 Beak, feathers, wings
 Lungs
 Hollow bones
 Lays eggs with hard
shell
 Endotherms
 Bilateral Symmetry
Mammals
 Live on land and in water
 Approx.5,500 know species
 Mammary glands
 Hair all over body
 Large brains
 Specialized teeth
 Lungs
 Endotherms
 Bilateral Symmetry
Riddles
I live in the water
I have simple muscles and nerves
I have radial symmetry
What am I?
A Cnidarian
Writing
your Riddles
Include 3-4 facts
about the phylum/class
(do not use
invertebrate/vertebrate)
Solving
others’
Riddles
2 parts to an
answer:
• Name the
phylum/class
• Tell if it is a
vertebrate or
invertebrate