1. Arthropods
Phylum Arthropoda

2. Phylum Arthropoda Over 900,000 Species “Jointed Legs”
External Skeleton made of Chitin - strong flexible polysaccharide - Molting to grow
Compound Eyes: many individual light detectors each with their own lens
Includes: crayfish, lobster, centipedes, millipedes, shrimp, spiders, insects

3. Ancient Arthropods
Trilobites

4. Subphylum Crustacea Copepods Daphnia Barnacles
Isopods = Sow Bugs, Pill Bugs
Japanese Spider Crab
Crayfish, Lobster, Crabs, Shrimp

6. Subphylum Chelicerata
Spiders
Scorpions
Mites, Ticks
Sea Spiders
Horseshoe Crabs

7. Subphylum Myriapoda
Millipedes
Centipedes

9. Class Insecta 3 body segments: Head, Thorax, Abdomen
Study of = Entomology
Insect Development -
Incomplete Metamorphosis: a nymph hatches from an egg and slowly develops into an adult; nymph looks like miniature adult without wings
Complete Metamorphosis: insect undergoes two stages of development between egg & adult

13. Classification Common Name: Crayfish
Scientific Name: Cambarus acanthura
Phylum: Arthropoda
Class: Crustacea
Other: Order: Decapoda “Crawfish”, “Crawdad”

14. Major Characteristics
Body Plan: Cephalothorax (fused head and thorax), Abdomen
Body Cavity: Coelom
Symmetry: Bilateral
Cell Specialization: Organs
Other: Appendage specialization

17. Life Support Processes
Absorption: Intestine
Feeding: Detritus feeders, Mandibles = mouthparts
Digestion: Stomach lined with teeth, Digestive glands near the stomach
Respiration: Feather-like Gills, as it walks the legs circulate water over them
Circulation: Heart - Open Circulation - Sinuses; Hemolymph = fluid

20. Life Support Processes
Excretion: Anus, Green Glands - eliminate excess water, Gills
Secretion: Digestive Glands
Response: Brain, Nerve cord, Ganglia, Sensory hairs in antenna & antennules (taste, touch, balance), Compound eye
Movement: Walking Legs, Swimmerets, Uropod, Telson
Reproduction: Male uses swimmerets to deposit sperm on the females telson

22. Life Support Processes
Support: Exoskeleton - Molts in order to grow in size - very vulnerable

24. Ecological Relationships
Aquatic
Terrestrial
Detritus Feeders

25. Body Systems Compared With Humans
Specialized Appendages
Movable Mouth Parts

26. Advancements Over The Previous Phylum
Gills
Appendages
Nervous System

27. Awesome Arthropods!
The largest Lobster species is the North Atlantic lobster (Homarus americanus). The largest ever caught weighed 44 lb. 6 oz. And measured 3 ft. 6 in. ! (Mmmmm, yummy!)
The largest of all crustaceans is the Giant Spider Crab. It’s body can reach a size of in. and have a claw span of 8-9 ft. !

30. Goliath Spider
Orb Weaver Spider - largest web18 ft. circumference