What is the difference between Cnidaria and Coelenterata?
Coelenterata has two subphyla namely cnidaria and Ctenophora. They are aquatic organisms. Cnidaria is a highly diverse group, which is a distinguishing feature called cnidocytes. Ctenophora is a less diverse group, which has comb plates.
What is the main 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.
What development do the Coelenterata have over Porifera?
The main difference between porifera and coelenterata is that porifera members possess many pores in their bodies while coelenterate members possess only one opening in the body. Porifera animals do not show symmetry and locomotion while coelenterata animals show radial symmetry and locomotion.
Why is Coelenterata also called Cnidaria?
Phylum Coelenterata is also known as Cnidaria due to the presence of cnidoblasts or cnidocytes on the tentacles and body surface. They contain stinging capsules called nematocysts.
What are the characteristics of porifera?
What are the characteristics of phylum Porifera?
- These are pore-bearing multicellular animals.
- The body has no organs.
- They exhibit holozoic nutrition.
- The body is radially symmetrical.
- They can regenerate their lost parts.
What is the difference between porifera and Cnidaria?
Cnidaria and porifera are two different phyla. Cnidarians have Cnidocytes but not the poriferans. Cnidarians have well-organized organ systems but not the poriferans; on the other hand, poriferans have an efficient tunnel system made up of pores but not the cnidarians.
What is the difference between Ctenophora and platyhelminthes?
The key difference between Coelenterata and Platyhelminthes is based on the germ layers of the organism. Coelenterates are diploblastic invertebrates whereas Platyhelminthes are triploblastic invertebrates.
What are three differences between the polyp and medusa forms of coelenterates?
Polyp have a tubular shape and are fixed at their base, with the mouth present at the other end of the tube facing the water. Medusa have a bell shape, with tentacles hanging down. Polyp do not have a manubrium. Medusa of the Hydrozoa class present a tube hanging down from the bell known as manubrium.
What is polyp and medusa of Coelenterata?
polyp and medusa, names for the two body forms, one nonmotile and one typically free swimming, found in the aquatic invertebrate phylum Cnidaria (the coelenterates). Some animals of this group are always polyps, some are always medusae, and some exhibit both a polyp and a medusa stage in their life cycle.