This document summarizes invertebrate groups. It explains that invertebrates do not have backbones and can be classified into three main groups: arthropods, molluscs, and other invertebrates. Arthropods are further broken down into four subgroups: insects, arachnids, myriapods, and crustaceans. Insects are described as having three body sections, two antennae and six legs, with examples given such as bees, ants, and grasshoppers. Arachnids are defined as having two body sections, eight legs and eight eyes, with spiders and scorpions listed. Myriapods have many legs and segmented bodies, exemplified by millipedes

1. SCIENCE-THIRD PRIMARY YEAR
CEIP CORTES DE ARAGÓN
(Teacher: Miguel Navarro)

3. INVERTEBRATE GROUPSINVERTEBRATE GROUPS
- INVERTEBRATE ANIMALS ARE THOSE ANIMALS THAT DO
NOT HAVE A BACKBONE.
- WE CAN CLASSIFY INVERTEBRATES INTO 3 GROUPS:
ARTHROPODS (ARTRÓPODOS), MOLLUSCS (MOLUSCOS) AND
OTHER INVERTEBRATE GROUPS.

4. ARTHROPODSARTHROPODS
- THIS GROUP INCLUDES 4 SUBGROUPS: INSECTS,
ARACHNIDS, MYRIAPODS AND CRUSTACEANS
- THEY HAVE EXOSKELETON

5. 1.- INSECTS1.- INSECTS
- THERE ARE NEARLY ONE MILLION KNOWN SPECIES OF
INSECTS
- THEY HAVE EXOSKELETON, 2 ANTENNAE AND 6 LEGS
- MOST HAVE WINGS
- THEIR BODY HAS 3 SECTIONS: HEAD, THORAX AND
ABDOMEN
- EXAMPLES: WASP (AVISPA), BEE (ABEJA), LADYBIRD
(MARIQUITA), MOSQUITO, ANT (HORMIGA), MANTIS,
DRAGONFLY (LIBÉLULA) OR GRASSHOPPER (SALTAMONTES)

6. STUDY THE EXAMPLE OF THE PARTS OF INSECTS IN PAGE 86

7. 2.- ARACHNIDS2.- ARACHNIDS
- THEY HAVE EXOSKELETON, 8 LEGS AND 8 EYES
- THEIR BODY HAS 2 SECTIONS: HEAD AND ABDOMEN
- EXAMPLES: SCORPION AND SPIDER

8. 3.- MYRIAPODS3.- MYRIAPODS
- THEY HAVE EXOSKELETON, 2 ANTENNAE AND LOTS OF
LEGS
- THEIR BODY HAS LOTS OF SEGMENTS
- EXAMPLES: MILLIPEDE (MILPIÉS) AND CENTIPEDE
(CIEMPIÉS)

9. 4.- CRUSTACEANS4.- CRUSTACEANS
- THEY HAVE EXOSKELETON, 2 EYES AND 4 ANTENNAE
- MOST HAVE 8 LEGS AND 2 CLAWS
- EXAMPLES: LOBSTER (LANGOSTA) AND CRAB (CANGREJO)

10. 4.- CRUSTACEANS4.- CRUSTACEANS
- THEY HAVE EXOSKELETON, 2 EYES AND 4 ANTENNAE
- MOST HAVE 8 LEGS AND 2 CLAWS
- EXAMPLES: LOBSTER (LANGOSTA) AND CRAB (CANGREJO)