What are the 5 classes of phylum Cnidaria?

What are the 5 classes of phylum Cnidaria?

CNIDARIA

• Anthozoa. Corals and sea anemones.
• Scyphozoa. Swimming Jellyfish.
• Staurozoa. Stalked Jellyfish.
• Cubozoa. Box jellyfish.
• Hydrozoa. Hydroids and siphonophores.

What animals belong to class scyphozoa?

The class Scyphozoa can be found in the phylum of Cnidaria, the phylum of the “stinging” creatures, such as jellyfish. There are approximately 200 species that belong to the class Scyphozoa, and they are the most familiar of the gelatinous creatures of our world. These include, sea nettles, moon jellies and jellyfish.

What is the genus of the freshwater Hydroid?

Hydra, a well-known freshwater genus that has the distinction of being solitary rather than colonial, lacks a medusa stage. Colonies of hydroids are typically 5 to 500 mm (0.2 to 20 inches) or more high and are branched; the branches bear the individuals, or zooids (hydroid polyps).

What class is phylum Cnidaria?

The phylum Cnidaria is made up of four classes: Hydrozoa (hydrozoans); Scyphozoa (scyphozoans); Anthozoa (anthozoans); and Cubozoa (cubozoans). All cnidarians share several attributes, supporting the theory that they had a single origin.

What is the phylum of a jellyfish?

phylum Cnidaria
“Corals, anemones, things we call hydroids, sea pens, and jellyfish,” lists Dr. Ames. They all belong to the phylum Cnidaria (pronounced ny – DARE – ee – a). A phylum is one of the large groupings used in taxonomical classification to refer to a group of creatures that has evolved from a common ancestor.

What makes a Hydrozoa a Hydrozoa?

The Hydrozoa is a subgroup of cnidarians containging approximately 3700 species. It is a diverse group with a variety of life cycles, growth forms, and specialized structures. Like many cnidarians, hydrozoans have both polyp and medusa stages in their life cycle.

How do you identify Hydrozoa?

Marine identification key: Hydrozoa. The Hydrozoa is a class of Cnidaria. They are characterized by having a life-cycle involving sexual and asexual reproduction. Most hydrozoans have a benthic, colonial polyp stage, which reproduces asexually by budding.

Is Scyphozoa a medusa or polyp?

Most species of Scyphozoa have two life-history phases, including the planktonic medusa or jellyfish form, which is most evident in the warm summer months, and an inconspicuous, but longer-lived, bottom-dwelling polyp, which seasonally gives rise to new medusae.

What is the name of the phylum to which Hydra belong?

Hydra, genus of invertebrate freshwater animals of the class Hydrozoa (phylum Cnidaria).

What is a freshwater polyp?

Hydra vulgaris, the fresh-water polyp, is a small animal freshwater hydroid with length from 10 mm to 30 mm and width about 1 mm.

How is a hydroid related to a jellyfish?

Hydroids are a life stage for most animals of the class Hydrozoa, small predators related to jellyfish. Some hydroids such as the freshwater Hydra are solitary, with the polyp attached directly to the substrate. When these produce buds, they become detached and grow on as new individuals. Section through a hydroid

What kind of form does a hydroid produce?

Hydroids may also reproduce in a more complicated way. In some hydroid species, the plant-like form produces tiny jellyfish-like forms (medusa) that break off from the branches and swim away.

How is a hydroid attached to the substrate?

Some hydroids such as the freshwater Hydra are solitary, with the polyp attached directly to the substrate. When these produce buds, they become detached and grow on as new individuals. The majority of hydroids are colonial.

What kind of organism is the Obelia hydroid?

Obelia Hydroid: First Generation. Obelia belongs to the phylum Cnidaria, which includes corals, sea anemones, jellyfish, and the freshwater hydra.