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5/10 & 5/11 - 7th Grade Agenda Learning Objective: Learn about arachnids & echinoderm Collect HW: Reading Notetaking 209 – 212 Microviewer Lab – Central Nervous System Video: Life in the Undergrowth Textbook Reading 438 – 439 HW: Reading & Notetaking 213 – 216 Reflection • Prompt: Describe 2 differences between insects and arachnids. What are Arthropods? Arthro = “Jointed” Pod = “Foot” • • • • • • • Insects Spiders Scorpions Lobster Crab Shrimp Centepedes Comparing Arthropods What are Crustaceans? • two or three body sections • five or more pairs of legs • two pairs of antennae. Crustaceans What is Metamorphosis? • Process in which an animal’s body undergoes dramatic changes during its life cycle • This is a picture of a Crab Larva Some arthropods have blue blood • Horseshoe crabs have blue blood • The have hemocyanin (which contains copper) instead of hemoglobin (which contains iron) in their blood • They are more closely related to spiders and scorpions • Has not changed much in 450 million years Insects! of all animal Which type73% of animal is most species are insects. numerous in the world? What are the characteristics of insects? • Invertebrates (Doesn’t have a backbone) • Exoskeleton (Exo = outside, skeleton) • Arthropod (Arthro = joined, Pod = Leg) • 3 pairs of legs • 1 pair of antennae • Most insects have wings What are Insect’s Three Body Sections? Head Thorax Abdomen What is found on an insect’s Head? • Head: Most of an insect’s sense organs, such as the eyes, mouth and antennae, are located on the head. What is found on an insect’s Thorax? • Thorax: An insect’s midsection is the section to which wings and legs are attached. What is found on an insect’s Abdomen? • Abdomen: Inside the abdomen are many of the insect’s internal and sexual organs. Small holes on the outside of the abdomen allow air, which contains oxygen, to enter the body. What is Complete Metamorphosis? Caterpillar Anatomy What is Gradual Metamorphosis? How big is the world’s largest Insect • Titan Beatle • 7 inches long Can you spot an insect here? • Dead Leaf mantis • Sand Grasshopper Can you spot an insect here? • Grasshopper • Walking stick insect Giant Millipedes • African black millipede • 15 inches long What are Arachnids? • Ticks, Mites, Scorpions & Spiders • two body sections • four pairs of legs What is the world’s largest spider? • Goliath bird-eater Spider • Eats mainly insect but will also eat lizards, bats and birds • 12 inches long • Lives in South America • Female will eat the male after mating How many eyes does a spider have? • Most have 8 eyes • Some spiders have 6, 4, 2, 0 eyes • But most spiders have 8 eyes How does spiders smell and hear? • Spiders smell and hear with tiny hair on its legs What are some examples of Echinoderm? • • • • Star Fish Sea Urchin Sea Cucumber Sand Dollar What are the characteristics of Echinoderms? • • • • Echino = “Spiny”, Derm = “Skin” Endoskeleton: Endo = inner, skeleton Five part radial symmetry Internal fluid system: Water vascular system Echinoderm’s Body Echinoderms are more closely related to humans than sponges Starfish Larva (Bilateral Symmetry) Mature Starfish (Radial Symmetry) Starfish facts • They can reproduce sexually and asexually • A sea-star arm can only regenerate into a whole new organism if some of the central disk of the sea star is part of the chopped off arm. • They don’t have a brain, heart or blood • They get their oxygen through their tube feet • They have a skeleton Reflection • Write 5 facts that you learned in the video