1. Arthropods (Phyllum Arthropoda)

2. 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

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

4. Four Kinds of Arthropods
Crustacean
Insects
Centipedes &
Millipedes
Spiders
crab
grasshopper
lobster
butterfly
barnacle
beetle
spider
centipede
bee
shrimp
scorpion
millipede
moth
tick
ant
mite

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

6. More Molting

7. 1. 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

8. 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.

9. The Exoskeleton Is made of a tough fibrous material called chitin.
This gives the skeleton strength and flexibility.
There are several pairs (5 or more) of jointed appendages (movable arms and legs).

10. Other Characteristics
Bilateral symmetry
Two main body segments-
Cephalothorax
Abdomen
They filter feed, scavenge, or are predatory
Use appendages for food getting and movement
Found throughout the oceans of the world
Are an important food source for other marine organisms
They reproduce sexually, fertilize externally
Have gills to breathe

11. Some Crustaceans
Crayfish
Marine Maine Lobster

12. Crabs

13. Barnacles

14. 2. Class Arachnida (Spiders, Scorpions, Ticks & Mites)
Very diverse class
Most species parasitic or predatory
Many possess book lungs for gas exchange
Spiders are able to produce a strong polymer - silk
Chilicera in form of fangs

15. Spiders

16. More Spiders…
Tarantula
Black Widow

17. For the true arachnophobe…
The brown recluse and its bite wounds

18. The Camel Spider

19. Ticks & Mites

20. Ticks & Lyme Disease…

21. Common Mites
Dust Mite
Common Mite

22. Scorpions

23. Class Picogonida (Sea Spiders)

24. Class Merostomata Ancient group of species
Changed little over 350 million years
Aquatic, mostly found on Atlantic & gulf coasts of United States

25. Subphylum Uniramai (3 Classes)
Class Insecta (insects)
Class Chilopoda (Centipedes)
Class Diplopoda (Millipedes)

26. Class Insecta (the insects)
Far & away the most diverse of animal groups
More types of insects alone than all other animal groups combined
Inhabit all terrestrial & freshwater ecosystems.
Success largely attributed to coevolution with flowering plants.

27. Insect Body Plan Insects have 6 legs 3 body parts
Head
Thorax
Abdomen
Most insects have wings, however in many species these are vestigal
Have advanced excretory system composed of malphygian tubules
Exchange gasses through a complex tracheal system

28. Vision
Have complex compound eye which is usually extremely sensitive to motion and allows 3600 vision
Most insects see well into the UV spectrum

29. Metamorphosis
Most insects undergo a process of metamorphosis - 2 types
Incomplete metamorphosis
Larva similar to adult, with differing body proportions
Undergoes a series of molts resulting in adult phenotype

30. Complete Metamorphosis
Larva is very unlike adult phenotype
Envelopes self in a coccoon or chrysalis where body breaks-down and reforms into adult form.

31. Classes Chiopoda & Diplopoda
Millipedes (diplopoda) are segmented worm-like animals
Have 2 pairs of legs per segment
Primarily herbivores & decomposers
Centipedes (Chilopoda)
Usually terrestrial carnivores
Have 1 pair of antennae
Are often poisonous, using modified front claws to immobilize prey

32. Centipedes vs. Millipedes