Saturday, December 24, 2016

Phylum Cnidaria-Characteristics and Examples



Welcome to MooMooMath and Science. In this video, I would like to talk about the kingdom Cnidaria.Cnidarians are invertebrates that are famous for stinging cells and they have radial symmetry. Let's take a look at the most famous Cnidarian, the jellyfish.
Cnidarians are famous for their sting, however, some do have sticky tentacles and others do inject their prey with a sting.
Here is what the harpoon would look like from a cnidarian.
There are two main types of cnidarians. The medusa has its tentacles facing downward. Let's take a look at a medusa cnidarian.
A polyp has their tentacles facing upward. The sea anemone is an example.
Cnidarians move with propulsion inside their bell. They don't move fast but it works.
Polyps also move. Sea anemones move slowly over rocks or detach and wiggle their base. Take a look at this example.
Cnidarians do not have a central nervous system, but they do have a crude nervous system or a nervous net.
Cnidarians can reproduce both sexually and asexually.
Asexual reproduction involves budding or they can divide into a new organism.
Here is an example of a life cycle of a cnidarian.
There are your cnidarians. The stinging animal.
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