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Hydra: Small animal that lives in fresh and clean water

What is it - biological definition

Hydra is a small invertebrate animal that inhabits fresh and clean water. The hydra is part of the Cnidarian phylum and the Hydrozoa class.

Summary of main features:

- They are small, being between 2 and 3 centimeters in length.

- They live in fresh, clean and cold water rivers and lakes. They get stuck in rocks or aquatic plants.

- They inhabit regions of temperate and tropical climate.

- Can be green, gray or brown.

- Hydras have the ability to regenerate. By losing part of her body, she regenerates easily.

- They have tubular and radially symmetrical body.

- Feeds on small aquatic invertebrate animals.

- It has a mouth at the end of the body, from which place thin and moving tentacles.

- They have simple nervous system.

- Hydras can be reproduced in two ways. She can drop eggs into the water, which will then be fertilized. Another way is through germination. A new being is generated in the body of a hydra, which releases it to have its independent life. This second form occurs when food is abundant.

Scientific classification:

Kingdom: Animalia

Phylum: Cnidaria

Class: Hydrozoa

Order: Anthomedusae

Family: Hydridae

Genre: Hydra

Biological curiosity: origin of the name

- The name was given to this animal in reference to a character from Greek mythology: the Lerna Hydra. According to Greek myths, this monster had three heads. When one of them was cut, two more were born in place.