1. The Armored Achievers pp. 125-131
Arthropods
The Armored Achievers pp

2. Arthropod
Largest phylum with 1 million species (3/4 of all animals on earth)
Segmented bilateral symmetry
Exoskeleton that must be molted in order to grow
Jointed appendages
Blood-vascular system
Mostly internal sexual reproduction

3. subphylums

4. Uniramia - Class Insecta
3 pairs of legs
largest & most diverse group on earth
rarely in the sea but live at the water’s edge
Ex. Water strider

5. Subphylum Chelicerata

6. Class Merostomata “Living fossils” NW Atlantic, Gulf, Japan, Korea
shallow, soft bottoms
Ex. Horseshoe crab (Limulus polyphemus)

7. mouth
carapace
abdomen
Book gills
Inhalent current
Repiratory chamber
Exhalent current

8. Class Pycnogonida 1mm - 40cm pole to pole
narrow body, proboscis, 4 very long legs
males carry the eggs
Ex. Sea Spiders

9. Subphylum Crustacea 35,000 species
Primarily marine, some freshwater, semi terrestrial, terrestrial
Use maxillae for filter – suspension feeding
Gills – adapted to live in water
2 pair of antennae for sensory

10. Classes of Crustacea

11. Crustacean classes

13. Subclass Cirripedia Free-swimming larva
Cement glands attach adult form to substrate (sessile)
Hermaphroditic (long coiled penis)
Ex. Barnacles

14. cirri
cement
gland

15. Subclass Copepoda
Most abundant plankton, largest protein source (1st level consumer)
Most are free-swimming but some are parasitic
First antennae long for drag
Planktonic larva of many crustacean
Ex. copepods

16. Class Malacostraca 14 segments + a telson
contains over half of all known crustaceans

17. Orders of Malacostraca

18. Order Isopoda Bottom dwellers (deep to intertidal)
Herbivorous scavengers
Ex. Pillbugs on land, gribbles in ocean

19. Order Amphipod burrowing in sandy and muddy sediments
usually flattened from side to side
three pairs of short tail limbs are used to flick them out of danger

20. decapods ‘10 legs’ largest
5 pair of walking legs - 1st pair heavier with pinchers (cheliped)
Ex. Crayfish, lobster, crab, shrimp

21. Callinectes sapidus