What are members of Class Hydrozoa?

Some examples of hydrozoans are the freshwater jelly (Craspedacusta sowerbyi), freshwater polyps (Hydra), Obelia, Portuguese man o' war (Physalia physalis), chondrophores (Porpitidae), "air fern" (Sertularia argentea), and pink-hearted hydroids (Tubularia).

1. What animals are in the Hydrozoa class?
2. What are members of Cnidaria?
3. What animals belong to the class scyphozoa?
4. Which invertebrates belong to the class Hydrozoa?
5. How are members of Class Hydrozoa different from the other classes in the phylum Cnidaria?
6. What makes a Hydrozoa a Hydrozoa?
7. Which group consists exclusively of cnidarians?
8. How do members of the class scyphozoa differ from other cnidarians?
9. How many body parts do cnidarians have?
10. What is the difference between Hydrozoa and scyphozoa?
11. How do you identify scyphozoa?
12. How do you identify Hydrozoa?
13. Where are Hydrozoa found?

What animals are in the Hydrozoa class?

Hydrozoa is a class within the phylum Cnidaria, which includes sea anemones, corals, and jellyfish. The vast majority are marine species, but freshwater hydrozoans are known, for example, Cordylophora lacustris and Craspedacusta sowerbyi.

What are members of Cnidaria?

cnidarian, also called coelenterate, any member of the phylum Cnidaria (Coelenterata), a group made up of more than 9,000 living species. Mostly marine animals, the cnidarians include the corals, hydras, jellyfish, Portuguese men-of-war, sea anemones, sea pens, sea whips, and sea fans.

What animals belong to the class scyphozoa?

Class Scyphozoa

These include, sea nettles, moon jellies and jellyfish. The jellyfish found in this class are dubbed "the true jellyfish".

Which invertebrates belong to the class Hydrozoa?

Overview. Cnidaria, the phylum to which Hydrozoa belongs, contains some 11,000 species of relatively simple invertebrate animals found exclusively in aquatic, mostly marine, environments. Cniderians include corals, sea anemones, jellyfish, sea pens, sea pansies, sea wasps, and tiny freshwater hydra.

How are members of Class Hydrozoa different from the other classes in the phylum Cnidaria?

Hydrozoans are polymorphs, existing as solitary polyps, solitary medusae, or as colonies. Hydrozoans are unique from all other cnidarians in that their gonads are derived from epidermal tissue.

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.

Which group consists exclusively of cnidarians?

Among the following given options only Hydra, Obelia, Adamsia, Physalia consists exclusively of Cnidarians as these organisms can be characterized by the presence of tentacles on their bodies. Members of this phylum are diploblastic. Their digestion can be intracellular or extracellular.

How do members of the class scyphozoa differ from other cnidarians?

Scyphozoan medusae differ from those of hydrozoans in lacking a velum. ... Scyphozoans, like all Cnidarians, are all carnivores and some are filter-feeders. Many smaller jellies feed on food particles trapped from the water while larger ones prey on fishes or swimming invertebrates.

How many body parts do cnidarians have?

Cnidaria have no organs like hearts or lungs. They have an internal cavity used for respiration and a gastrovascular cavity (a "stomach") with a mouth but they do not have an anus. They possess a body wall made from two layers (the ectoderm and the endoderm) separated by a jelly-like layer called the mesoglea.

What is the difference between Hydrozoa and scyphozoa?

Differences between a Scyphozoan & Hydrozoan medusae? Schyphozoans - More 'jelly & 4 oral arms. Hydrozoans - No oral arms. Have a velum ring & less jelly (fold up when preserved).

How do you identify scyphozoa?

Scyphozoans share a number of attributes with other cnidarians: (1) they typically possess tentacles, (2) their symmetry is radial, (3) the body wall consists of an outer epidermis and inner gastrodermis, separated by a layer of jelly-like mesoglea, (4) the mouth is the only opening to the digestive system, (5) ...

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.

Where are Hydrozoa found?

Most Hydrozoans live in saltwater but some species, like Hydra, are found in freshwater. Most hydrozoans have both a polyp stage and a medusa stage in their life cycles. Most are found as small colonies made up from tiny polyps connected together by hollow stems (called hydrocauli).