Characteristics features of Cnidaria: 1.




While all Cnidarians share many characteristics, each class displays some unique characteristics as well.The majority of Cnidarians share the characteristic of radial symmetry.

Subsequent layers of mud buried the jellyfish along with many other soft-bodied invertebrates. They are diploblastic animals with a radially symmetrical body. Most Cnidarians have complicated reproductive cycles that include an asexual stage and a sexual stage. Many cnidarians have an asexual stage, usually in the form of asessile polyp which asexually produces other polyps and medusae. Get exclusive access to content from our 1768 First Edition with your subscription.

Bilateral symmetry means a single plane drawn through the middle of the organism will show mirror images across the plane.





Most of them have soft translucent body ,mouth at one end leading to a body of hollow cavity. 2.





They are diploblastic animals and have a more complex level of organization than

Many fossil Cnidaria are members of Anthozoa.

This nerve net may show the presence of groups of cells in the form of nerve plexi (singular plexus) or nerve cords. They sequester the space that is therefore made unavailable to other organisms, thus having a profound impact on Between the two body layers lies the jelly-like mesoglea. The nematocysts act like tiny harpoons, reacting to stimuli by hurling out small stinging cells that both poison and hook potential prey. Knide=nettle and L. aria=like or connected with. All cnidarians share several attributes, supporting the theory that they had a single origin. This interesting group of animals take its name from the large cavity in the body that serves as the intestine.They include the hydra, jellyfish, sea anemones and corals. Instead they have a nerve net.
The predominant signaling molecules in these primitive nervous systems are chemical peptides, which perform both excitatory and inhibitory functions.



The mesoglea of cnidarians is not as highly developed as the mesoderm of other animal groups, being primarily gelatinous with only a few fibrous or amoeba-like cells.

Phylum Cnidaria or coelenterate includes diverse animals like jelly fish, sea anemones, corals and the more familiar Hydra. The sessile form of Obelia geniculate has two types of polyps: gastrozooids, which are adapted for capturing prey, and gonozooids, which bud to produce medusae asexually.All cnidarians show the presence of two membrane layers in the body that are derived from the endoderm and ectoderm of the embryo. Polyps of most hydroids, hydrocorals, and Many of the world’s benthic (bottom-dwelling) ecosystems are dominated by anthozoans. The mesoglea acts as little more than a glue in some Cnidarians while making up most of the animal, as in the case of the jellyfish, in other Cnidarians. In this case, polyps are sessile (asexual stage) while medusa is free-swimming (sexual stage).In their body, circulatory, respiratory and excretory systems are absent.

Subsequent layers of mud buried the jellyfish along with many other soft-bodied invertebrates. They have one continuous space or gastrovascular cavity called coelenteron.

Animals from the phylum Cnidaria have stinging cells called cnidocytes.

The famous reef is the Great Barrier Reef which is more than 2000 km along the northeastern coast of Australia, made by the cnidarians.The phylum Cnidaria is composed of the following three classes on the basis of development of zooids:The representatives of Phylum Cnidaria have radial or biradial symmetrical body. Cnidarians only have two body layers, the ectoderm and endoderm, separated by a jelly-like layer called the mesoglea. Cnidarians therefore may provide clues and insights into the development of more complex body structures.All Cnidarians share particular trait: tentacles with stinging nematocysts.

All cnidarians are characterized by radially symmetric body plans, rather than the bilaterally symmetric body plans that are found in most other animal phyla. The anthozoans, the sea anemones and corals, are all sessile species, whereas the scyphozoans (jellyfish) and cubozoans (box jellies) are swimming forms.






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