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MAIN CHARACTERISTICS
• They haven’t got a spinal column or an internal skeleton.
• Invertebrates have got different body covering
• Hard shell
• Rigid covering Exoskeleton
• Without protection
• They have got a rigid body covering or exoskeleton.
• Their bodies are divided into jointed parts.
• They’ve also got jointed legs that they can bend.
ARTHROPODS
THEY CAN BE SEPARATED INTO FOUR GROUPS:
INSECTS
• They have 6 legs.• Their bodies have 3
parts: head, thorax and abdomen.
ARACHNIDS
• They have 8 legs.• Their bodies are
divided into 2 parts: cephalothorax and abdomen
CRUSTACEANS
• They have 10 legs and a very hard exoskeleton.
• Their bodies are divided into 2 parts: cephalothorax and abdomen.
MYRIAPODS
• They have many legs.
• Their bodies are divided into 2 parts: head and trunk.
abdomen cephalotorax
• They’ve got a soft body.
• Most mollusk have a hard Shell. They have also a thin layer next to
their shell called the mantle. It protects their organs.
• Many mollusks have a muscular foot which they use to move
around.
MOLLUSKS
THEY CAN BE SEPARATED INTO 3 GROUPS:
BIVALVES
• Have a Shell with 2 parts called valves.
• Soft body and no head.• They are filter feeders
(They filter water to extract nutrients)
GASTROPODS
• Can have a Shell or not.• They have a head and
body and 4 tentacles.• Most of them are
herbivores.
CEPHALOPODS
• They have a head with a mouth and well-developed eyes.
• They have long arms to catch their food and some of them have tentacles.
• Most of them are carnivores.
• Almost all of them live in the ocean.
• Sponges can’t move around. They stay in one place.
• They have a soft body with holes called pores. Sponges are filter feeders.
They filter water through their pores to extract nutrients.
SPONGES
• Almost all of them live in
the ocean.
• They are carnivores.
JELLYFISH AND POLYPSJellyfish
They float and swim in the ocean.
The mouth is on the underside of the body.
PolypsThey have a body that is shaped like a
bag.
They have a suction cup at one end of their body to anchor themselves to
the floor.