No, the freshwater hydra does not have a medusa stage in its life cycle. The hydra belongs to the class Hydrozoa, which typically do not have a medusa stage like other cnidarians such as jellyfish. Instead, hydras reproduce asexually by budding.
Members of Class Hydrozoa include organisms such as Portuguese man o' war, fire corals, and hydras. These are predominantly marine animals characterized by their unique life cycle with alternating medusa and polyp stages.
In the phylum cnideria there are three classes. They are hydrozoa, scyphozoa, and anthozoa. In the class hydrozoa, their habitats are fresh and marine water. In scyphozoa, their habitats are marine only. In anthozoa, their habitats are marine only.
Hydra belongs to the phylum Cnidaria and the class Hydrozoa.
Hydra , Obelia e.t.c. belong to Class Hydrozoa because the Characteristics of the animal that has a life cycle that includes a polyp and a medusa , gametes ectodermal . They also belong to the Phylum Cnidaria witch means that they have stinging cells .
Hydrozoa
hydrozoa
It is not a single cell. It if a fully developed animal. It's a very cool one at that. It has stinging cells and tentacles with which it catches its prey. It can swim around or attach itself to something and stay there. It swallows its prey whole. Since it has only two layers of cells if you have one you can see through it and watch its prey being digested. How cool is that?
hydrozoa
one idea
polyp! The star coral is attached and is faceup
Jellyfish belong to the phylum Cnidaria, which includes other organisms like corals and sea anemones. Within the phylum Cnidaria, jellyfish are classified into the class Scyphozoa, which includes true jellyfish, and the class Hydrozoa, which includes hydroids and smaller jellyfish species.