ANIMALS WITHOUT BACKBONES GRADE 4 INVERTEBRATES Invertebrates do not have a backbone. Most animals on Earth do not have backbones! Symmetry: when two parts of an object are identical along an imaginary dividing line.
For example, this shape can be divided along a midline: AQUATIC INVERTEBRATES Aquatic animals live in the water Many animals that live in water are invertebrates Sponges: the simplest invertebrates. Made up of two cell layers. Shaped like a sack with an opening.
Do not have symmetry Cnidarians: have tentacles, which are arm-like limbs with stinging cells on the end. Some stay in one place while others swim. SPONGES CORAL AND SPONGES
MOLLUSKS AND ECHINODERMS Mollusks: All have shells Most have shells outside the body and stay in one place Some have shells inside the body and move Echinoderms: Have spiny skin
Have endoskeleton Endoskeleton: internal support structure MOLLUSKS THAT MOVE MOLLUSKS THAT STAY IN ONE PLACE ECHINODERMS
ARTHROPODS Largest group of invertebrates They have: Jointed legs Body divided into sections Exoskeleton Hard covering that protects the body Keeps moisture in
Examples are lobsters, bees, insects, spiders INSECTS AND CENTIPEDES Insects One pair of antennae Three pairs of legs One or two pairs of wings Three body sections
Centipedes and millipedes Long slender bodies and many legs Centipede: one pair of legs on each section Millipede: two pairs of legs on each section ARACHNIDS AND CRUSTACEANS Arachnids: Four to five pairs of legs
Two body sections Fangs Examples: spiders, ticks scorpions Crustaceans: Two pairs of antennae Two or three body sections Ability to chew Most live in the oceans
Examples: shrimp, crabs, lobster SOME CRUSTACEANS CENTIPEDES AND MILLIPEDES SOME INSECTS WORMS
Three types: Flatworms Flat Three cell layers thick
Some live inside other animals One opening for food and wastes
Roundworms Round One way digestive system
Most live inside the bodies of other animals Segmented worms Round
Bodies have segments, or sections Separate opening to get rid of waste
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