There are approximately 35,000 recognized spider species worldwide. Spiders are found all over the world and are predatory, feeding largely on insects. They trap prey using silk nets or ambushing tactics. Spiders breathe through book lungs or tracheal systems and have 8 simple eyes. Their ability to spin silk from specialized glands is important for web building and sensing vibrations to catch prey. Male spiders fertilize females by depositing sperm on small webs for the females to take internally and lay fertilized eggs in silk cocoons. While spiders have venomous glands, their venom is usually harmless to humans unless it is a black widow or brown recluse spider, which can deliver severe or fatal bites when threatened.

2. How many species of spiders are there
in the world?
• ORDER ARANEAE: SPIDERS
• THE SPIDERS ARE A LARGE GROUP OF 35.000
RECOGNISED SPECIES

3. WHERE ARE SPIDERS DISTRIBUTED?
• THEY ARE DISTRIBUTED ALL OVER THE
WORLD.

4. Spiders trapping the dam
• ALL SPIDERS ARE
PREDACEOUS
AND FEED
LARGELY ON
INSECT

5. WHEN ARE THE SPIDERS ARE IN GROUP?
• Some spiders chase their prey,
others ambush them , and many
trap them in a net of silk.

6. RESPIRATORY SYSTEM OF SPIDERS
• SPIDERS BREATHE BY
MEANS BOOK OF
LUNGS (MANY
PARALEL EAR
POCKET) OR
TRACHEAE (SYSTEM
OF AIR TUBES THAT
CARRY AIR DIRECTLY
TO THE SPIRACLES).

7. EYES
• SPIDERS USUALLY HAVE 8 SIMPLE EYES. THEY
ARE USED FOR PERCEPTION OF MOVING
OBJECTS.

8. • THE ABILITY TO SPIN SILK
IS AN IMPORTAT FACTOR
IN THE LIVES OF SPIDERS.
SPIDERS HAVE SPECIAL
GLANDS THAT EMIT A
LIQUID THAT HARDENDS
ON CONTACT WITH AIR
TO FORM THE SILK
THREAD. THESE THREADS
WILL STRETCH BEFORE
BREAKING. THE SPIDERS
WEB VARIES WITH THE
SPECIES. BY SENSING THE
VIBRATIONS OF ITS WEB
THE SPIDERS CAN JUDGE
THE SIZE OF ITS PREY.

9. DOES THE MALE SPIDER fertilize the
female?
• BEFORE MAITING,
THE MALE SPINS A
SMALL WEB,
DEPOSITS A DROP OF
SPERM , ON IT , THEN
IT PECKS IT AND
STORES IN A SPECIAL
CAVITY. THE FEMALE
LAYS FERTILIZED IN A
SILKEN COCOON
WHICH CAN CONTAIN
HUNDREDS OF EGGS.

10. ARE ALL SPIDERS POISONOUS?
• THEY HAVE POISONOUS GLANDS,
WITH WHICH THEY DISPATCH THEIR
PREY.

11. ARE SPIDERS REALLY DANGEROUS?
• SPIDERS ARE TIMID
CREATURES,THE VENOM
PRODUCED TO KILL THE PREY IS
USUALLY HARMLESS TO
HUMANS.
• SPIDERS BITE WHEN
THREATENED OR WHEN
DEFENDING THEIR EGGS.
• THERE ARE HOWEVER , SOME
SPIDERS THAT CAN GIVE
SEVERE OR FATAL BITE;SUCH AS
THE BLACK WIDOW AND THE
BROWN RECLUSE.

12. • ANIMAL DIVERSITY
• BY: HITMAN AND ROBERT
• LEONEL ARRIAGADA
• 2° 2°