5/5 & 5/6 - 7th Grade Agenda Learning Objective: Learn about Arachnids & echinoderm Collect HW: Reading & Notetaking p.217 – 218 Chap 11 Study Guide Video: Life in the Undergrowth Textbook Reading 434 – 445 HW: Reading Guide Section 4 &5 Reminder: Chap 11 Test on 5/12 & 5/13

Reflection Prompt: Draw what a new species of arthropods might look like in 100 million years and describe its features.

What are Arthropods? Arthro = “Jointed” Pod = “Foot” Insects Spiders Scorpions Lobster Crab Shrimp Centepedes

Comparing Arthropods

What is Complete Metamorphosis?

Caterpillar Anatomy

What is Gradual Metamorphosis?

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 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 Prompt: Write 5 facts from the video.