Presentation on theme: "9. Arthropods Largest and most successful phylum in the animal kingdom. 85% of all animals! Exoskeleton made of Chitin (light/hard polysaccharide). Jointed."— Presentation transcript:
19. ArthropodsLargest and most successful phylum in the animal kingdom. 85% of all animals!Exoskeleton made of Chitin (light/hard polysaccharide).Jointed Appendages.Cephalization-compound eyes, ocelli (eyespots), antennae.
6SUBPHYLUM MANDIBULATES Antennae, Mandibles & MaxillaeIncludes 4 classes-Crustacea, Diplopoda, Chilopoda & Insecta.Crustaceans-add some limestone to the chitinous exoskeleton.Lobsters & crabs are the giants of this group-most are a few centimeters long.
7CrustaceansIn addition to lobsters & crabs, shrimp, copepods and barnacles all belong to this class.Due to the nature of their rigid exoskeleton, crustaceans must “molt” or shed their shell in order to grow.They use an enzyme to split their shell & then crawl out.
9MILLIPEDES & CENTIPEDES Class Diplopoda-The millipedes only have about 100 legs with 2 pairs-legs/segmentClass Chilopoda-The centipedes have fewer legs (1 pair/segment).While millipedes scavenge on decaying plant material, centipedes are predators w/venom glands.
10CLASS INSECTA Class Insecta-largest group of animals in the world! 3 Body parts-Head, Thorax & Abdomen6 legs, Antennae, MandiblesMalpighian tubules (Kidneys) get rid of their wastes.
12METAMORPHOSISOne last reason for arthropod success is their ability to go through stages that exploit different food at different times in their life.Incomplete Metamorphosis-Egg-Nymph-Adult. The nymph stage is like a miniature form of the adult.Complete Metamorphosis-Egg-Larvae-Pupae-Adult.