1. UNIT 8 ANIMALS

2. PHYLUM ARTHROPODA (jointed appendages)
General information -most diverse of all animals -highly adapted Features -exoskeleton (chitin) -jointed appendages -segmented body -open circulatory system -sensory organs -compound eyes (most)
5 groups Trilobites (oldest fossils) Crustaceans Chelicerates (daggerlike mouth parts) Insects Myriapods (long bodies with many legs)

3. Crustaceans -marine Features -2 body sections: cephalothorax and abdomen -1 pr appendage per body section -2 pr attennae -exoskeleton -carapace

4. Appendages functions -collecting food -mating -protection

5. Appendages:
Claws
2. Antennae
3. walking legs
4. Swimmerets
5. mandibles.

6. Types -decapods (10 legs) ex. Lobster, crabs -isopods (7 pr legs) ex
Types -decapods (10 legs) ex. Lobster, crabs -isopods (7 pr legs) ex. Pill bugs,

7. Arachnids Largest group of chelicerates Ex
Arachnids Largest group of chelicerates Ex. Spiders, ticks Horseshoe crabs, mites

8. Chelicerates Features -no antennae -4 pr walking legs -1 pr chelicerae -1 pr pedipalps
poison gland
spinnerets
fangs

9. Examples Arachinds- live on land Features -8 legs -fanglike pincers, venon -silk glands 4 adaptations -waterproof cuticle -book lungs -Malpighian tubules -spiracles Diverse group -silk -venom

10. Insects Dominant terrestrial arthropods -most niches Features -3 body parts -head -thorax -abdomen

11. Metamorphosis -incomplete- miniature adults when hatched 3 stages -larva -nymph -adult

12. -complete – changes form entirely 4 stages -egg -larva -pupa -adult

13. Adaptation -flight occurred 400 myo Mouth adaptation -sucking -chewing -both

14. Arthropods and humans
Share resources -herbivores that destroy crops -insecticides unwanted side effects Alternatives -arthropod specific insecticides -pest management -genetically modified crops

15. Vectors -carry diseases from 1 host to another Ex
Vectors -carry diseases from 1 host to another Ex. Bubonic plague Yellow fever Malaria West nile virus