Arthropoda

Arthropods have a segmented body, a tough exoskeleton, and jointed appendages. Exoskeleton is make up of chitin- a protein and a carbohydrate

CRUSTACEANS(lobsters, crabs, shrimp, crayfish, barnacles)

SPIDERS (Arachnids) and relatives(horseshoe crab, mites, ticks, scorpions)

INSECTS(“bugs”, centipedes, millipedes)

Environment Crustaceans – mostly aquatic Spiders and Insects – in all types of environments.

Insect subphylum contains more species than ALL other groups of animals alive today

Food Source Include herbivores, carnivores and omnivores Their mouthparts have evolved in ways that

enable different species to eat almost any food you can imagine

Maintaining Homeostasis - Internal(Circulation, Respiration, Excretion)

Breath through a network of branching tracheal tubes, air enter and leaves the body through spiracles (small openings along the body)

Open circulatory system and a well developed heart

Waste leaves by Malpighian tubules- saclike organs that extract wastes from the blood and the add them to feces or digestive waste

Maintaining Homeostasis – External (Response) Have a brain, a well developed nervous system

and sophisticated sense organs (eyes & taste)

Movement Well-developed groups of muscles that are

coordinated and controlled by the nervous system.

Reproduction Some internal fertilization (land) Some external fertilization (water)

Evolutionary Milestone The evolution of arthropods, by natural selection,

has led to fewer body segments, and highly specialized, jointed appendages for feeding, movement, and other functions.

Picture and Vocabulary Pictures Fig 28-5 p.718

Fig 28-15 p.727Fig 28-18 p. 729

Vocabulary: exoskeleton(715), appendage(715), molting719), metamorphosis (729)