What are characteristics of Coelenterate?

What are characteristics of Coelenterate?

Characteristics. All coelenterates are aquatic, mostly marine. The bodyform is radially symmetrical, diploblastic and does not have a coelom. The body has a single opening, the hypostome, surrounded by sensory tentacles equipped with either nematocysts or colloblasts to capture mostly planktonic prey.

What are 5 characteristics of Coelenterata?

General characteristics of Phylum Coelenterata

• Kingdom: Animalia.
• Habitat: aquatic, mostly marine.
• Habit: solitary or colonial.
• Symmetry: radially symmetrical.
• Grade of organization: tissue grade of organization.
• Germ layer: diploblastic, outer ectoderm and inner endoderm.

What characteristics do cnidarians have?

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 are two different forms of the body in Coelenterate animals?

The coelenterates characteristically have two basically similar types of individuals differing in structural details, called the polyp and the medusa. The polyp is sessile.

What are four features of phylum Coelenterata?

The body is radially symmetrical. The digestion is both intracellular and extracellular. The nervous system and the circulatory system is absent….Scyphozoa

• They are found exclusively in the marine environment.
• Medusa is dominant and umbrella-shaped.
• Polyps are not present.
• Mesogloea is cellular.

What are the function of tentacles?

Tentacles are slender, flexible organs on the head. They may function in sensory perception and in actually securing food.

What is the characteristic feature present only in the phylum Coelenterata?

Nematocysts are the most distinguishing feature of this phylum. Coelenterates do not have sensory organs. Respiration and excretion occur through simple diffusion. The circulatory system is absent.

What are the two body form characteristics of cnidarians?

Cnidarians mostly have two basic body forms: swimming medusae and sessile polyps, both of which are radially symmetrical with mouths surrounded by tentacles that bear cnidocytes. Both forms have a single orifice and body cavity that are used for digestion and respiration.

Which type of body wall is present in Coelenterates?

Body wall of coelenterates is diploblastic. It is made of inner endoderm and outer ectoderm. Two layers are divided by mesogloea.

Which is the simplest characteristic of a Coelenterata?

Characteristics of Coelenterata Usually known to be the simplest of all animals groups, Coelenterates have true tissues and the gastrovascular cavity, which is the characteristic coelenteron.

Where are coelenterates usually found in the sea?

They are usually found living at the bottom of the sea, often attached to rocks. Coelenterates are multicellular organisms and can be found living solitarily or also in groups.

What kind of cell does a coelenterate have?

Coelenterates are simple, radially oriented animals with tentacles, a mouth, and only a single entrance to the gut ( Figure 19.4 ). They are also characterized by stinging cells, or cnidoblasts ( Figure 19.5 ), that are used to stun prey and provide protection.

How many species are there in the phylum Coelenterata?

Phylum Coelenterata includes nearly 11,000 known species half of which are extinct. The classification followed here is given by Hyman, L.H., (1940). According to Hyman phylum, Coelenterata has been classified into 3 classes. Class 1. Hydrozoa (Gr., hydra=water +zoios=animal) Freshwater or marine. Solitary or conical.

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