PHYLUM ARTHROPODA.

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Presentation transcript:

PHYLUM ARTHROPODA

Overview One of the most diverse phyla First arthropod appeared 600 millions years ago, in the sea.

Vocabulary review for all Arthropods (Ask Students to Define each of the following Vocabulary words) Triploblastic High levels of Cephalization (sophisticated heads) Open circulatory systems Ceolom Metamorphosis

3 Main Characteristics of Arthropods YOU TELL ME! Exoskeleton Jointed Appendages (arms and legs) Segmented Body

Does a caterpillar have an exoskeleton? YES. It is just more flexible and leathery than other exoskeletons

EXOSKELETON Made of Chitin (carbohydrates) Same material as your nails Major evolutionary advancement but has its advantages and disadvantages.

Advantages and Disadvantages of an Exoskeleton (Hand out reading assignment-”Skeletons” and go to next slide when students are finished)

The Good The Bad Protection Waterproof (prevents desiccation-water loss) Can help in movement Require molting as they do not grow with the creature (high energy, vulnerability) Size limiting

This coconut crab is about as big as creatures with exoskeletons are thought to get on land

FEEDING ALL METHODS! Herbivores (e.g. grasshopper) Carnivores (e.g. crabs, spiders, praying mantis, Scorpions) Parasites (e.g. ticks, mites) Filter feeders (marine- E.g. Krill) Detritus feeders/ Scavengers

INTERNAL TRANSPORT (Circulatory) Open Circulatory System with well-developed heart How it works: Heart Contract pump bloods through arteries and vessels blood leaves tissue & go into sinuses (spaces) blood collect in cavity near heart

Spiracles let air in and out, Click video link please Video: ..\..\..\Lesson Videos\Biology 11\Arthropods and Echinoderms\6. Insect circulatory system.flv

Molting (all arthropods) To shed exoskeleton

Metamorphosis Video What's the difference between complete and incomplete metamorphosis? Have students define metamorphosis and give examples ..\..\..\Lesson Videos\Biology 11\Arthropods and Echinoderms\Complete vs. Incomplete Metamorphosis.flv Ask students what are some advantages of complete metamorphosis?