Unit1 Invertebrates 4 primaria, Apuntes de Ciencias de la Tierra y del Medio Ambiente

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UNIT 1. INVERTEBRATES

PRIMARY 4 / Natural Science

Pedro Antonio López Hernández

INVERTEBRATES

Characteristics of invertebrates

• They eat other living things.
• Nearly all of them can move

from one place to another.

• They are oviparous because

they lay eggs.

Classifying of invertebrates

Invertebrates don´t have

INTERNAL SKELETON.

Types of invertebrates

• Sponges
• Jellyfish
• Worms
• Arthropods
• Molluscs
• Echinoderms

MORE INVERTEBRATES

Sponges

• They live at the bottom of the sea.
• They are FIXED to the ground.
• Their body is full of holes, known as PORES (Food and water enter their body through these pores).

Jellyfish

• They can be very dangerous animals.
• They have poisonous TENTACLES that they use to hunt other animals and to defend themselves.

Echinoderms (Starfish

and urchins)

They have many small feet that they use to move along the bottom of the ocean.

Worms

• They have long soft

segmented bodies

that is made up of

RINGS.

• Some of them live in

the ground and

others live in the

water.

Molluscs

• They can live on land (terrestrial) or in water (aquatic).
• They have SOFT MUSCULAR BODIES to move along the ground or water.
• They have a SHELL.
• There are three types of molluscs that have shells:
• Molluscs with two shells which are called VALVES. For example: Mussels.
• Molluscs with one shell. For example: Snails.
• Molluscs with an internal shell. For example: Squid.