DessectMe: The Arthropods

Amber Lyn Keating PAP Bio Mrs. Vu 1st period

A little bit about The Arthropods

  • A phylum, Arthropoda has many creatures under their name.
  • Segmented bodies are arranged into regions called "tagmata."
  • Their nervous systems are dorsal and their circulatory system is open and ventral.
  • They are symmetrical in that they are bilateral
  • The Arthopods are divided into two families... The Chelicerates and the Mandibulates.
  • Arthropods are the most diverse, widely spaced out phylum for all animals.

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FUN FACT!

  • The Phylum Arthropoda has over 1 million species, most of them insects, most of those insects being beetles.

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Objectives

We will evaluate two preserved arthropods (grasshopper and crayfish), look for similarities in these two animals that may be phylum traits, and look for differences in the two that may be class traits.
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Background Information: The Crayfish

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FUN FACT!

After Crayfish mate, the female carries a cluster of eggs attached to her swimmerets. Swimmerets are feathery things under the crayfish's abdomen.

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Background Information: Grasshopper

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FUN FACT!

A grasshopper with exceptionally long antennae are called Long-horned.

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Arthropods and the Integuentary System

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Arthropods have hard shell made of calcium carbonate secreted by the mantle, a heavy fold of tissue that surrounds the mollusc's internal organs. Spiders, insects, lobsters, and shrimp, have bodies covered by an external skeleton, the exoskeleton, which is strong, impermeable, and allows some arthropods to live on land. The exoskeleton is composed of layers of protein and a tough polysaccharide called chitin, and can be a thick hard armor or a flexible paper-thin covering. Arthropods grow by shedding their exoskeletons and secreting a larger one in a process called molting.

Since the exoskeleton of an arthropod is a rigid structure, it must be shed and replaced periodically to enable growth. This shedding process is known as molting or ecdysis and consists of a series of four stages. First, enzymes are secreted that loosen the old exoskeleton layers. Second, the new exoskeleton layers are secreted. Third, the old exoskeleton splits and falls off. Finally, the new exoskeleton hardens and sets.

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FUN FACT!

Arthropods are a highly successful group of animals- they account for over three quarters of all currently known living and fossil organism.

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