What is the difference between Class Hydrozoa and class scyphozoa?

What is the difference between Class Hydrozoa and class scyphozoa?

The difference between most hydrozoans and most scyphozoans is that in hydrozoans, the polyp stage usually predominates, with the medusa small or sometimes absent. Often, the medusa never breaks away from the parent polyp, and remains in a state of arrested development, although its gametes function.

What is the difference between anthozoa Hydrozoa Scyphozoa?

In anthozoans, cubozoans, and scyphozoans, gametes develop in the endoderm, whereas in hydrozoans they ripen in the ectoderm, although they do not necessarily originate there. Sexes are commonly separate, but hermaphroditism is known. Some hermaphroditic species are capable of self-fertilization.

Which of these are characteristics that can help you distinguish between Hydrozoa and Scyphozoa medusae?

The difference between most hydrozoans and most scyphozoans is that in hydrozoans, the polyp stage usually predominates, with the medusa small or sometimes absent.

Which of the following are characteristics of members of Class scyphozoa?

Which of the following are characteristics of class Scyphozoa? They move by jetting water from the gastrovascular cavity or space beneath it, using the rhythmic contraction of muscles and the medusa is the major body form, with the polyp being greatly reduced or even absent in some species.

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) …

Do Scyphozoa have a exoskeleton?

Scyphozoans have no durable hard parts, including no head, no skeleton, and no specialized organs for respiration or excretion.

How do hydras differ from other cnidarians in the class Hydrozoa?

Other hydrozoan species are solitary polyps (Hydra) or solitary hydromedusae (Gonionemus). One defining characteristic shared by the hydrozoans is that their gonads are derived from epidermal tissue, whereas in all other cnidarians they are derived from gastrodermal tissue.

What’s the difference between medusae and polyps?

Polyp are sessile while medusa are mobile. Polyp present a tubular shape with the mouth facing the water upwards,while medusa present a bell shape with the mouth facing the water downwards. Polyp do not have a manubrium, while medusa of the class Hydrozoa present a tube hanging down from the bell known as manubrium.

Which of the following are characteristics of members of Class scyphozoa quizlet?

What are the unique features of cnidarians?

What Are 5 Characteristics of Cnidarians?

• Radial symmetry.
• Diploblastic animals.
• Tissue level of organisation.
• Presence of cnidoblasts with stinging nematocysts on the tentacles.
• Polymorphism and have two body forms, i.e. polyp and medusa.

What structural characteristics differentiate the various classes of cnidarians?

Cnidarians share several basic characteristics. All Cnidaria are aquatic, mostly marine, organisms. They all have tentacles with stinging cells called nematocysts that they use to capture food. Cnidarians only have two body layers, the ectoderm and endoderm, separated by a jelly-like layer called the mesoglea.

What is the difference between Scyphozoa and Cubozoa?

Key Points. Cubozoans differ from Scyphozoans in their arrangement of tentacles; they are also known for their box-shaped medusa. Out of all cnidarians, cubozoans are the most venomous.

How many tentacles do Scyphozoa have?

eight
There are four elongate oral arms and eight long tentacles that alternate with eight rhopalia in the clefts between lappets. There is no polyp stage.

What makes hydras different than other cnidarians?

Because the hydra does not have a separate opening for waste, any material that cannot be digested is regurgitated out of its mouth. Cnidarians do not have a head or a brain or other organs that we find familiar to animals. It is amazing that they can live, eat, and respond to their environment.

What are the similarities between polyp and medusa?

Both have a Radially symmetrical body. Body wall of both organisms is diploblastic. Both are carnivorous. The mouth and manubrium of medusa are homologous to the mouth and hypostome of the polyp.