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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 do all Cnidaria have in common?
- Which of these are found in Coelenterata?
- Are sexes separate in Coelenterata?
- Which of the following groups consists exclusively of Cnidarians?
- Do coelenterates have mesoderm?
- What are the two basic forms present in Coelenterata?
- Do Coelenterates sting?
- Is Adamsia a medusa or polyp?
- Are Coelenterates Acoelomates?
- What is polyp and medusa?
- Is a box jellyfish a cnidarian?
- Are starfish cnidarians?
- Which cnidarians are attached?
What do all Cnidaria have in common?
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. Most Cnidarians have radial symmetry.
Which of these are found in Coelenterata?
The Phylum Coelenterata consists of marine organisms that have a body that is radially symmetrical and a mouth that has sensory tentacles that help in capturing prey easily. Other animals belonging to the Phylum Coelenterata are hydra, comb jellies, true jellies, sea pens, coral animals, sea anemones and more.
Are sexes separate in Coelenterata?
While considering phylum coelenterata..are the sexes separate or not? ... Cnidarians or coelentrates are hermaphrophites. Some of the species are capable of self-fertilization. Otherwise, the gametes are generally shed into the sea(external fertilization), where the eggs are fertilized.
Which of the following groups consists exclusively of Cnidarians?
Among the following given options only Hydra, Obelia, Adamsia, Physalia consists exclusively of Cnidarians as these organisms can be characterized by the presence of tentacles on their bodies.
Do coelenterates have mesoderm?
Since coelenterates possess only body cavity and no development of mesoderm in germ layer and no true internal coelom, they are not considered coelomates in which well differentiated organs can be accommodated.
What are the two basic forms present in Coelenterata?
The coelenterates characteristically have two basically similar types of individuals differing in structural details, called the polyp and the medusa. The polyp is sessile.
Do Coelenterates sting?
Symptoms of coelenterate stings can vary from a mild itch to a stinging burning or throbbing pain. The pain may be localised or accompanied by abdominal or chest pain.
Is Adamsia a medusa or polyp?
Polyp is sessile and cylinderical form like Adamsia (b). Medusa is unbrella shaped and free-living like Aurelia (c). Polyp produce medusae sexually and medusae form the polyp asexually (e.g., Obelia).
Are Coelenterates Acoelomates?
Coelenterata has no separate body cavity or coelom, so it is called Acoelomate.
What is polyp and medusa?
There are two basic cnidarian body shapes: a polyp form, which is attached to a surface; and an upside-down free-floating form called a medusa. Some cnidarians change form at different phases of their life cycle, while others remain in one form for their entire life.
Is a box jellyfish a cnidarian?
Chironex sp. Box jellyfish (class Cubozoa) are cnidarian invertebrates distinguished by their box-like (i.e. cube-shaped) body. Stings from some species, including Chironex fleckeri, Carukia barnesi, Malo kingi, and a few others, are extremely painful and often fatal to humans. ...
Are starfish cnidarians?
The phylum Cnidaria (pronounced nid-AIR-ee-ah) contains approximately 9000 living species worldwide. ... A common example of radial symmetry is the sea star (a member of the Echinoderm phylum) or the anemone, a Cnidarian (seen below). The Cnidarians include the hydroids, jellyfish, anemones, and corals.
Which cnidarians are attached?
Many cnidarian species have two different body forms during their lives. One is the free-swimming form, called the medusa (a jellyfish for instance). The other is an attached form called the polyp (which resembles a tiny sea anemone). Both forms have a single opening that serves as the mouth and anus.
