Home School Life Journal

Home School Life Journal
"Let us strive to make each moment beautiful."
Saint Francis DeSales
painting by Katie Bergenholtz

Invertebrates of the Kingdom Anamalia



One interesting thing we learned while studying Invertebrates was that it often matters what symmetry the animal has in terms of how scientist classify them.

  • Spherical symmetry is when an organism can be cut into two identical halves by any cut that runs through its center. A ball has spherical symmetry. 
  • Radial symmetry is when an organism can be cut into two identical halves by any longitudinal cut through its center.
  • Bilateral symmetry is when an organism can be cut into two identical halves by one single longitudinal cut along its center which divides it into right and left halves.



There are many organisms in this phylum, including mollusks, clams, snails, oysters, and squid.
They have several mutual characteristics, the most common being a shell.
Cephalopods: Squids
All members of this phylum have radial symmetry. They have tentacles which catch prey by releasing nematocysts, small capsules that contain a toxin that is injected into prey or predators.

You may be familiar with these as natural sponges you can buy at the store in the art or beauty sections. Though they're animals and not plants, they can't think; they have no internal organs, no blood, no eyes, or ears, but can reproduce, digest food, and protect themselves.Sponges have no symmetry.

3 comments:

  1. Wow, I didn't know any of this before. Thanks for sharing!

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  2. Thanks for the lesson! Great notebook pages. I confess that the whole animal classification thing has always confused me, but I also find it fascinating.

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  3. I love that printable up at the top, so much fun!

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