CNIDARIA:JELLYFISHAngela Floreza and Anyang

Taxonomy

Taxonomy cont.

Habitat and Distribution

In the Earth’s oceans and seas, there are over 2000 types of jellyfish!

Some live in the cold (but not freezing) parts of the artic

And most of them live in the warmer waters.

Structure

You can see that most jellyfish have radial symmetry. It can have a plane that can rotate on the body.

Locomotion

These creatures are able to swim WITHOUT a heart or a brain.

Jellyfish can move themselves by a pulsing their body with a stimulus.

Digestive System

These creatures are carnivores, They have to hunt to get their food.

The sting their victims, injecting them with venom…

Their prey consist of fish and other jellies.

The catch their prey with their movement With every

expansion, They draw in their small prey.

When they contract they push their prey to their tentacles.

Nervous System

it characterized by a series of interconnected nerve cells (a nerve net).

The nerve net conducts impulses around the entire body of the jellyfish.

The strength of a behavioral response is proportional to the stimulus strength.

• Nervous system work when jellyfish receptors for

1. Light 2. touch 3. balance. 4. chemical detection

Reproduction

The eggs and sperms developed inside the body wall called “ Gonads”

After eggs are fully developed then release into stomach then through the mouth into the sea.

In most case, male jellyfish releases his sperms into the surrounding water. then the sperms swims into female jellyfish’s mouth—the fertilization occur.

Reproduction

The egg is released into the water and it becomes a larvae.

The larvae attaches itself to a base and it becomes a polyp which looks like an anemone)

It develops more and it will create and release the baby jellyfish

One larvae can produce +5 jellyfish

Reproduction