5/10 & 5/ th 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? Insects Spiders Scorpions Lobster Crab Shrimp Centepedes Arthro = “Jointed ” Pod = “Foot”

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

Which type of animal is most numerous in the world? Insects! 73% of all animal species are insects.

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