how does a sponge obtain food how does a planarian move

Classification of Hydra – the Phylum Cnidaria Finally, you will also learn where and how to collect a hydra for your microscopic project.

We will also see what happens to a sick hydra. I will show you several interesting behaviors when a hydra feeds or move. In this article, you will learn about this fantastic creature in detail: by definition, classification, and cellular structure. Upon contact with prey, the contents of the stinging cells are explosively discharged, firing stings that can paralyze small animals.īiologists are especially interested in hydra because of their remarkable regenerative ability – they do not appear to die of old age, or to age at all. Each tentacle is clothed with many stinging cells. These tentacles can greatly extend to catch the prey or use for locomotion. Hydra is characterized by its tentacles around the mouth opening. This is why the hydra is often mistaken for a plant or alga. Typically, hydras remain attached to some underwater objects, waving their tentacles slowly with the current. It is visible to the naked eyes when fully extended. Hydra has a cylindrical, radially symmetric body from 2 to 20 mm in length. Hydra is a genus of tiny fresh-water organisms that are classified under the phylum of Cnidaria. References What is Hydra? A quick overview.How is Hydra’s Regenerative Capability?.How Can I Tell if a Hydra is Healthy or Sick?.How to Find Hydras for Your Microscopic Project?.Classification of Hydra – the Phylum Cnidaria.

How does a sponge obtain food how does a planarian move