5/14 & 5/15 - 7th Grade AgendaLearning Objective: Learn about arachnids & echinodermCollect HW: Reading Notetaking 209 – 212 Micro Viewer Lab (Central Nervous System)Video: Life in the Undergrowth Textbook Reading 438 – 439HW: 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

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)

Reflection

• Write 5 facts that you learned in the video