Download Classifying Animals L4 part 1

Classifying Animals
Lesson 4
3 Ways to Classify Living
Things
• First, study the cell structure. Is it plant, or
animal?
• Second, how does an organism get
nutrients? (How does it eat?)
• Third, how does an organism reproduce?
(Bacteria have cells that split, a tree might
flower and seed.)
Invertebrate Animals
• An invertebrate is an organism that lacks a
backbone.
• Sponges, Cnidarians, Mollusks,
Echinoderms, Arthropods and Worms are
all examples of Invertebrate animals.
Simple Invertebrates
• Include, Sponges, Cnidarians and Worms.
• Most simple invertebrates live in aquatic
environments. (water)
Porifera: Sponge
• Phylum Porifera: Sponges are animals
that have no true organization.
• Sponges have no real tissue or organs.
• Sponges are asymmetrical
Porifera: Sponge
Cnidarians
• Jellyfish, Sea Anemones, corals, and
Hydras
• Cnidarians have radial symmetry
• Cnidarians have a mouth, tentacles,
muscle tissue, and stinger cells.
• (Cnidarians look the same right side up as
they do upside down.)
Cnidarians
Worms
• Flatworms:
Flatworms are the
simplest of the worm
groups. They are
found many places
and can be free living
or parasitic. (Tape
worm) Only has a
one ended digestive
system.
Worms
• Roundworms: One of the most diverse of
all animals. They are found in many places
and can be free living or parasitic.
(Roundworms are what you treat your pets
for!) Roundworms have a two ended
digestive system.
Worms
• Segmented worms: Annelids are
segmented, with each segment bearing
the same fundamental structures as all the
others, though minor differences can occur
between some segments. By distributing
organs among many segments, it
becomes less dangerous to an annelid if
one organ is damaged.
• (These are what you fish with!)
Complex Invertebrates
• Mollusks, Echinoderms and Arthropods
are all included in Complex Invertebrates.
• Complex Invertebrates live in many
different environments.
• Some have specialized organs and body
structures.
Mollusks
•
•
•
•
•
•
All Mollusks share the same body plan.
All have a muscular “foot”
Mantle
Internal organs
Bilateral symmetry
Includes, snails, clams, and squids.
Echinoderms
• Include Sea Stars, Sea Urchins, and sea
Cucumbers
• Echinoderms have a hardened skeleton
inside the body. (Endoskeleton)
• Echinoderms use a water pressure system
to feed, breathe and move.
Echinoderms
Arthropods
• Most numerous animal group on Earth!
• Include Spiders, Crabs, and Insects.
• Hard Exoskeleton on the outside of their
body.
• Segmented body, with paired limbs on
either side of their body.
• Some have wings, claws, or multiple legs
Arthropods