5/14 & 5/15 - 7 th grade agenda learning objective: learn about arachnids & echinoderm...
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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
What are Arthropods?
• Insects• Spiders• Scorpions• Lobster• Crab• Shrimp• Centepedes
Arthro = “Jointed” Pod = “Foot”
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
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 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 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
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
Echinoderms are more closely related to humans than sponges
Starfish Larva(Bilateral Symmetry)
Mature Starfish (Radial Symmetry)
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