What is the difference between cnidarians and ctenophores?
Cnidaria and Ctenophora are two types of phyla composed of coelenterates. Cnidarians exhibit radial symmetry whereas ctenophores exhibit biradial symmetry. Both contain tentacles, surrounding their mouth. The main difference between cnidarians and ctenophores is their body symmetry.
Who are the cnidarians and ctenophores?
Cnidarians and ctenophores are two groups of unique animals that we find in marine environments. Commonly known as jellyfish, sea anemones, corals, hydras, and the Portuguese man-of-war, cnidarians belong to the phylum Cnidaria. The ctenophores, which belong to the phylum Ctenophora, are the comb jellies.
What structures do all cnidarians and ctenophores share?
What are the general characteristics of Cnidarians? All have two tissue layers, a single digestive opening, and stinging cells called nematocysts. They have radial symmetry.
Do ctenophores have cnidaria?
The one species of Ctenophora possessing nematocysts had been thought to link the phyla. Mills and Miller have shown that members of the phylum Ctenophora obtain their cnidae by preying on a medusa, and the similarity in body form is considered convergence due to the pelagic way of life.
What are the main differences among porifera cnidaria and Ctenophora?
Porifera, Cnidaria, and Ctenophora are the most primitive clade of metazoans. They distinguish themselves from the other metazoans by their lack of bilateral symmetry. Inside their clade, each phylum is clearly distinguished by its general features.
What are two differences between the jellyfish and ctenophores?
Body forms: polyp or medusa. What are two differences between the jellyfish and Ctenophores? Ctenophores lack the bag-like cnidarian body shape and they do not have Cnidocytes- stinging sells.
How do hydras feed?
Food Habits Hydra capture their food by paralyzing and killing the food organism by means of nematocysts, which are discharged into the prey. The prey is brought to the mouth (proctostome) by the tentacles, a response that is induced glutathione.
Which of the following is common feature of cnidarians and ctenophores?
general feature common to members of both cnidaria and ctenophora is Radial symmetry.
What are cnidarians symmetry?
Cnidarians are radially symmetrical (i.e., similar parts are arranged symmetrically around a central axis). They lack cephalization (concentration of sensory organs in a head), their bodies have two cell layers rather than the three of so-called higher animals, and the saclike coelenteron has one opening (the mouth).
What animals live in cnidarians?
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 are the different types of cnidarians?
Types of Cnidarians The Cnidarians include the hydroids, jellyfish, anemones, and corals. All Cnidarians use tentacles which have stinging cells which are used to subdue and capture food. The word “Cnidarian” means “stinging creature” in Latin (an old language that is still used in identifying animals).
How are cnidarians characterized?
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 cnidarians classes?
Cnidarians are divided into three major classes. These are the Hydrozoa (hydras and other colony-forming species), the Scyphozoa (jellyfish), and the Anthozoa (sea anemones and corals).