Question

General features of Phylum Coelenterata.

Answer 1

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Classification of phylum Coelenterata.

Kingdom : Animalia
Subkingdom : Eumetazoa
Phylum. : Coelenterata

Phyla

Ctenophora

Cnidaria
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Coelenterata is an obsolete term encompassing the animal phyla Cnidaria(coral animals, true jellies, sea anemones, sea pens, and their allies) and Ctenophora (comb jellies).

The name comes from the Greek"koilos" ("hollow") and "enteron" ("intestine"), referring to the hollow body cavity common to these two phyla.

They have very simple tissue organization, with only two layers of cells (external and internal), and radial symmetry.

Some examples are corals, which are typically colonial, and hydra, jelly fish and sea anemones which are solitary. Coelenterata lack a specialized circulatory system relying instead on diffusion across the tissue layers.
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General Features of Phylum Coelenterata:-

<> Kingdom: Animalia
<> Habitat: aquatic, mostly marine.

<> Habit: solitary or colonial. Each individual is known as zooid.

<> Symmetry: radially symmetrical

<> Grade of organization: tissue grade of organization.

<> Germ layer: diploblastic, outer ectoderm and inner endoderm. Mesogloea separates these two layer

<> The body has a single opening called hypostome urrounded by sensor y tentacles.

<> Coelom: gastrovascular cavity or coelenteron.

<> Nematocyst: organ for capturing and paralyzing pray, present in tentacles

<> Nutrition: holozoic

<> Digestion is both intracellular and extracellular.

<> Respiration and excretion are accomplished by simple diffusion.

<> Circulatory system: absent

<> Nervous system: poorly develop

<> Many forms exhibit polymorphism ie. Polyp and medusa

<> Polyps are sessile, asexual stage

<> Medusa are free swimming, sexual stage

<> Metagenesis: asexual polypoid generation alternate with sexual medusoid generation

<> Reproduction:

<> Asexual: by budding

<> Sexual: by gamatic fusion

<> Fertilization: internal or external

<> Development: indirect with larval stage

<>(Koilos: hollow, enteron: cavity)

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example of Phylum Coelenterata :-

Hydra

Obelia (Sea fur)

Physalia (Portuguese man of war)

Velella (Sail by wind)
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Answer 2

These animals live in water.cavity is present in the body. The body is made up of two layers of cells. Some of these species live in colonies(corals).