1. There are four main kinds of arthropods.
An arthropod is an invertebrate with an exoskeleton, a segmented body, and jointed legs.
There are four main kinds of arthropods.
1. Crustaceans
3. Centipedes &
Millipedes
2. Spiders & Scorpions
Ticks & Mites
4. Insects

2. There are three characteristics that all arthropods have.
There are more than 1 million kinds of arthropods on Earth.
There are three characteristics that all arthropods have.
1. exoskeleton
2. segmented body
3. jointed legs

3. An exoskeleton is a hard, outer covering.
All arthropods have an
An exoskeleton is a hard, outer covering.

4. Some arthropods grow too big for their exoskeletons.
molt.
These arthropods will
Molting is to leave an exoskeleton and grow a new one.

5. More Characteristics of Arthropods
Arthropods have segmented bodies.
Arthropods have jointed legs.
Arthropods have a heart to
pump blood through their bodies.
Arthropods reproduce sexually.

6. Crustacean Crustaceans are ... Crabs Lobsters Barnacles Shrimp
A crustacean is an arthropod that has a hard, exoskeleton, two pairs of antennae, and a mouth for crunching and grinding.
Crustaceans are ...
Crabs
Lobsters
Barnacles
Shrimp

7. special respiratory organs that help some
Crustaceans
Crustaceans can _____________ certain parts of their body.
re-grow
stone crab
A ___________ can re-grow its claws.
Most crustaceans live in ____________ and get oxygen from the water through _________.
water
gills
Gills are
special respiratory organs that help some
animals breathe and get oxygen from the water.

8. Insects and their relatives are ARTHROPODS.
What is Entomology?
The study of insects
(and their near relatives).
What are insects
(and near relatives)?
Insects and their relatives are
ARTHROPODS.

9. Insects

10. What is an insect?
3 body parts
head
thorax
abdomen

11. What is an insect?
compound eyes

12. What is an insect?
two antenna

13. What is an insect?
exoskeleton

14. What is an insect?
6 legs

15. Class Arachnida Scorpions Scorpionida Daddy Long legs Opiliones
4 Orders - Spiders Araneae
Scorpions Scorpionida
Daddy Long legs Opiliones
Ticks and Mites Arcarina

16. Characterisitics of spiders ( Order Araneae )
6 pairs of appendages
4 pairs of walking legs
1 pr. of chelicera ( most anterior
head appendage)
1 pr. of pedipalps
no antennae
no segmentation
head-chest fused to form cephalothorax
breathe with book lungs or trachea
poison glands with fangs ( on the chelicera )

19. Tarantula molting

20. Trapdoor spider

21. Black and
Yellow
Argiope
(Garden
Spider )

22. Brown recluse spider
Violin shape on dorsal side

23. Female Black Widow Spider

24. Order Scorpionidae - segementation prominent

26. Harvestmen – Daddy Long legs
Order Opiliones feed more as scavengers
Harvestmen – Daddy Long legs

27. Order Arcarina
Adult female deer tick

28. Cutting proboscis in mouth of tick

29. Female dog tick

30. (many legged arthropods)
Classes of Myriapods
(many legged arthropods)
(all have one pair of antennae, a head region, and trunk with many pairs of legs, use trachea)
Diplopoda - millipedes
Chilopoda - centipedes

31. Myriapods Millipede (Diplopoda) Centipede (Chilopoda)
[one pair of antennae, head & trunk regions, trunk with many pairs of legs]
Millipede (Diplopoda)
Two pair of legs per visible segment, attached under body.
Centipede (Chilopoda)
Pair of fangs under head, one pair legs per visible segment - attached to side of body.
No fangs, no eyes, legs attached to side of body.

32. Millipede (Diplopoda)
Centipede (Chilopoda)
Garden centipede

33. Classes of Crustacea Sowbugs or pillbugs Sand fleas Barnacles
mostly marine, fresh water, a few terrestrial
all have two pair of antennae
five or more pairs of legs
segmented abdominal appendages
head & trunk or cephalothorax & abdomen body arrangement
have gills
Sowbugs or pillbugs
Sand fleas
Barnacles
Crabs, lobster, shrimp

34. Crayfish cephalothorax
(Decapoda)
Sowbug (Isopoda),
a terrestrial crustacean