1. Arthropods
Kingdom Animalia
Phylum Arthropoda

3. There are ____ kinds of invertebrates. six
Invertebrates are animals that have no backbone.
There are ____ kinds of invertebrates.
six
You have already learned about four kinds.
Worms
Sponges
Mollusks
Cnidarians

4. 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

6. There are more than 1 million kinds of arthropods on Earth.

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

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

11. More Characteristics of Arthropods
Arthropods have a heart to
pump blood through their bodies.
Arthropods reproduce sexually.

12. Crustacean
Kingdom Animalia
Phylum Arthropoda
Class Crustacea

13. 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

15. Features of Crustaceans
Bilateral symmetry
Bodies divided into two segments
Cephalothorax
Head and chest region
Abdomen
Including the tail, if present
Carapace – part of the exoskeleton that covers the head and chest region

16. Crustaceans such as lobsters, crabs, and shrimps have five pairs of legs located under their carapace.
they are referred to as the decapods (meaning “ten legs”).

17. The head contains two eyes, two pairs of antennae, and special mouthparts used for feeding.
The thorax contains the food-getting appendages and the walking legs.

18. Some crustaceans, such as the lobster, can glide along the sea bottom by using their small paddle like appendages, called swimmerets, which are located under the abdomen.

19. Lobster Lobsters are predators!
Two common lobster species are the northern lobster and the spiny lobster.
Lobsters are aggressive and often fight amongst themselves.
Lobsters can regrow limbs!
Lobsters are predators!

20. Crabs
Crabs live everywhere—on land and in the sea, and from surface waters down to the great ocean depths.
More than 4000 species of crabs.

21. Fiddler Crab Digs tunnels in the sand along the shore
When the tide comes in, fiddler crabs retreat to the tunnels and plug up the entrances with sand.
At low tide, the fiddlers leave their tunnels to search for food.
Named for its one large claw

22. mole crab
lives in the turbulent tidal zone along sandy beaches

23. Hermit crab
born with a soft abdomen that lacks an exoskeleton, making it vulnerable to attack.
For protection, the hermit crab finds an empty snail shell to live in.
As the hermit crab increases in size, it outgrows its old snail shell and has to find a larger one.

25. Giant spider crab The biggest crab in the ocean
Can have legs 4 meters long!

26. Shrimp
Looks like a smaller version of a lobster

27. Copepods Most abundant crustacean in the ocean Less than ½ cm long
Eats mainly diatoms
very important part of the zooplankton community

28. Krill Cold water relative of the copepod Grow to 5cm in length
Most krill live in Antarctic waters
planktonic animal
eats diatoms

29. Amphipod
live in the intertidal zone
Related to Pill bugs

30. Isopod Live in intertidal zone seven pairs of legs
Some are parasitic; they live by attaching to the gills and skin of fish
Examples: sea roaches

31. Barnacle often mistaken for a mollusk Found in intertidal zone
attached to rocks and other hard surfaces
Its overlapping, sharp calcium carbonate plates, which resemble a mollusk’s shell, protect the animal inside.

32. Barnacles continued Barnacles attach to almost anything Filter feeders
Hermaphrodite

33. Horseshoe Crab Class Merostomata not a true crab; No antennae
six pairs of legs
actually more closely related to spiders and scorpions than to crustaceans
has four eyes—two simple eyes and two compound eyes—located on the top of its carapace

35. Horseshoe crab continued
Tail used for locomotion and flipping itself over
Lay eggs in the sand in the spring
Can live up to 20 years
Has been around for 400 million years

37. 2-3: Echinoderms spiny skin Kingdom Animalia Phylum Echinodermata
* Echinoderm means _______________. All echinoderms have spiny skin.
spiny skin

38. Echinoderms five There are ______ characteristics of echinoderms.
All echinoderms have:
Spiny skin
An internal skeleton
A five part body
A water vascular system
Tube feet

39. Characteristics of Echinoderms
* All echinoderms have __________. Some of them have small hair-like spines, like the starfish.
spiny skin
* Some echinoderms have long spines, like the sea urchin.

40. Characteristics of Echinoderms
* The internal skeleton of an echinoderm is made of _______________________.
bony plates that are bumpy or spiny.
* An echinoderm’s water vascular system is _________________________________.
a system of tubes that carry food and oxygen and remove wastes
* The water vascular system also helps an echinoderm _____.
move

41. Characteristics of Echinoderms
tube feet
* Echinoderms have __________.
tube feet
* An echinoderm’s tube feet are used for _________________________________.
moving and for getting food

42. Starfish sea stars five or more tube feet
* Starfish are also called ___________.
sea stars
* Starfish have __________ arms connected to a central body.
five or more
* On the bottom of the arms are hundreds of ___________ that look like suction cups.
tube feet

43. Starfish * A starfish is able to re-grow its arms.
* A starfish uses its tube feet to move and to open its food.

44. Sea Urchins spines poisonous
* Sea urchins have longer and sharper ________ that they use to protect themselves.
spines
* Some sea urchins have ________ spines.
poisonous

46. Sea Urchins sea plants tube feet
* Sea urchins have a mouth hidden under its body.
* A sea urchin uses its five teeth to eat ____________.
sea plants
* A sea urchin is not very active. Sometimes, it does move slowly using its __________. When not moving it uses its feet to stick to the ocean floor.
tube feet

48. Sea Cucumber
Soft, oblong body
Lacks arms
Tube feet arranged in 5 rows

49. http://video. nationalgeographic

50. Sand Dollars Filter feeders Burrow in the sand
When it dies the soft parts decay, the internal skeleton is what remains.