INVERTEBRATES

THERE ARE 6 GROUPS OF INVERTEBRATES

• Sponges
• Cnidarians
• Worms
• Mollusks
• Arthropods and Echinoderms

THERE ARE 4 DIFFERENT MAIN CATEGORIES INSIDE EACH GROUP

• Characteristics
• Body Structure
• Reproduction
• Examples/Categories

SPONGES

• Sponges have the most simple body structure
• They filter water for food
• A peace of sponge breaks off the parent, floats away and starts to grow
• Chickenliver sponge
• Branching tube sponge

CNIDARIANS

• They are mostly made out of water
• They have a two way digestive system.
• They reproduce by budding and some use medusa, and some use both
• Jellyfish, Coral, sea anemones, sea cones
• They have a squishy soft body

WORMS

• There are three different types of worms
• Flat worms, Round worms, and Segmented worms
• They reproduce sexually by producing a rice sized cacoon that the worm hatches from
• They have a one way digestive system
• Tape worms, earth worms,

MOLLUSKS

• They have a mantel, foot, and bilateral mass
• They have bilateral symmetry
• Some have shells, some don't
• They reproduce by laying eggs and fertilizing them and both male and female can do it
• Clams, snails, slugs, octopus and squid are examples

ARTHROPODS

• Biggest group of animals in the world
• Segmented body with 3 parts, head, thorax, and abdomen
• They have jointed apendeges
• They reproduce sexually by laying eggs
• Insects, arachnids, crustaceans, ants, spiders, and crabs are examples

ECHINODERMS

• They have prickly skin
• They can regrow limbs
• They have a nervous system but no brain
• They exert a sperm into the water and it settles to the bottom and starts to turn into an echinoderm
• Sea star, sea cucumber, sea lilies, sea urchins, and sand dollars are all examples