INVERTEBRATES Animals that do not have bones So They don’t have a skeleton or a backbone

1.- Classification Invertebrates are classified into smaller groups. Invertebrates are classified into smaller groups. Sponges Sponges Cnidarians Cnidarians Echinoderms Echinoderms Worms Worms Molluscs Molluscs Arthropods Arthropods

SPONGES They are the simplest type of animal that exits. They are the simplest type of animal that exits. They cannot move.They attach themselves to rocks or the sea floor. They cannot move.They attach themselves to rocks or the sea floor. They are often irregular in shape. They are often irregular in shape. Their bodies have lots of small holes that allow water to pass in and out. Their bodies have lots of small holes that allow water to pass in and out. They eat microscopic organisms in the water that they filter through their body. They eat microscopic organisms in the water that they filter through their body.

CNIDARIANS Cnidarians have jelly-fish like bodies. Cnidarians have jelly-fish like bodies. They are aquatic animals. They are aquatic animals. They have very simple bodies with an opening at one end.This opening acts like a mouth and an anus. They have very simple bodies with an opening at one end.This opening acts like a mouth and an anus. They have soft tentacles that can sting you. They have soft tentacles that can sting you. Some, such as coral and sea anemone, attach to rocks. Others, such as jellyfish, can move about. Some, such as coral and sea anemone, attach to rocks. Others, such as jellyfish, can move about. Many cnidarians like jellyfish and sea anemones have a poisonous substance in their tentacles to catch their prey. Many cnidarians like jellyfish and sea anemones have a poisonous substance in their tentacles to catch their prey. Jellyfish Jellyfish Sea anemone Sea anemone white coral white coral

ECHINODERMS Echinoderms are symetrical. Echinoderms are symetrical. Starfish tipically have 5 or more arms which radiate from a central point where their mouth is. Starfish tipically have 5 or more arms which radiate from a central point where their mouth is. Echinoderms are invertebrates with hard plates under their skin.Some like sea urchins have movable spines on the outside of their bodies. Echinoderms are invertebrates with hard plates under their skin.Some like sea urchins have movable spines on the outside of their bodies. They live in the bottom of the sea. They live in the bottom of the sea. Starfish Starfish Sea urchins Sea urchins

WORMS Worms are animals with long, soft bodies and moist skin. Worms are animals with long, soft bodies and moist skin. They do not have legs. They do not have legs. They move by wriggling. They move by wriggling. Most live in the sea or in fresh water. Some live on land like earthworms. Most live in the sea or in fresh water. Some live on land like earthworms. Some worms are parasites. They live in the intestines of other animlas and eat their food. Some worms are parasites. They live in the intestines of other animlas and eat their food.

MOLLUSCS Molluscs are classified into 3 groups. Molluscs are classified into 3 groups.Gastropods.Bibalves.Cephalopods.

GASTROPODS Gastropods usually have a shell where they hide in when they sense danger. Gastropods usually have a shell where they hide in when they sense danger. They move by sliding on a slimy, mucus substance that they excrete. They move by sliding on a slimy, mucus substance that they excrete. snail snail

BIVALVES Bivalves have one shell divided into 2 moving parts called valves, which they close when they sense danger. They usually stay in one place. They eat small organisms that are in the water. Bivalves have one shell divided into 2 moving parts called valves, which they close when they sense danger. They usually stay in one place. They eat small organisms that are in the water. mussel clams oyster mussel clams oyster

CEPHALOPODS Cephalopods have no protective external covering but some have a shell hidden under their skin. Cephalopods have no protective external covering but some have a shell hidden under their skin. All cephalopods are marine animals. All cephalopods are marine animals. They have eight or ten tenctalces that help them to swim and catch teir prey. They have eight or ten tenctalces that help them to swim and catch teir prey. octopoussquidcuttlefish

ARTHROPODS Arthropods have an external skelenton called exoskeleton which supports and protects the body. Arthropods have an external skelenton called exoskeleton which supports and protects the body. Classification: Classification: CrustaceansArachnids MyriapodsInsects.

CRUSTACEANS Most of them live in the sea. Most of them live in the sea. They usually have 10 legs They usually have 10 legs The exoskeleton is very hard. The exoskeleton is very hard. lobstercrabprawns lobstercrabprawns

ARACHNIDS Arachnids ar terrestrial and carnivorous. Arachnids ar terrestrial and carnivorous. Arachnids have 8 legs. Arachnids have 8 legs. spiderscorpion spiderscorpion

MYRIAPODS Myriapods have many legs in their bodies. Myriapods have many legs in their bodies. centipedesmillipedes centipedesmillipedes

INSECTS Insects have 6 legs.butterfly Insects have 6 legs.butterfly Many insects have wings. Many insects have wings. Their body is divided into 3 parts:head, thorax and abdomen. Their body is divided into 3 parts:head, thorax and abdomen. flymosquito grasshopper flymosquito grasshopper beewasp