What is the body plan of Coelenterata?
What is the body plan of Coelenterata?
All coelenterates are aquatic, mostly marine, animals. The body form 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 is the general body plan of cnidarians?
Cnidarians have two distinct body plans, the medusa (a) and the polyp (b). All cnidarians have two membrane layers, with a jelly-like mesoglea between them. Some cnidarians are dimorphic, that is, they exhibit both body plans during their life cycle.
What are the general characteristics of Coelenterata?
What are the characteristics of Coelenterates? The Coelenterates are aquatic, mostly marine organisms. The body is radially symmetrical and exhibit a tissue-level organization. Their mouth is surrounded by sensory tentacles, which helps to capture their prey.
Which type of body wall is present in Coelenterates?
Coelenterates have a body wall consisting of two layers of cells of many different types in which there is an outer epithelium (“ectoderm”) and an inner gastrodermis (“entoderm”), sandwiching a variably proportioned jellylike substance, the mesoglea, that ranges from a thin, noncellular membrane to a thick, fibrous or …
What is the meaning of Coelenterata?
coelenterate. / (sɪˈlɛntəˌreɪt, -rɪt) / noun. any invertebrate of the phylum Cnidaria (formerly Coelenterata), having a saclike body with a single opening (mouth), which occurs in polyp and medusa forms. Coelenterates include the hydra, jellyfishes, sea anemones, and corals.
What are the 2 body plans of cnidarians?
Cnidarians have two body forms—polyp and medusa—which often occur within the life cycle of a single cnidarian. Sea nettle (Chrysaora fuscescens). The body of a medusa, commonly called a jellyfish, usually has the shape of a bell or an umbrella, with tentacles hanging downward at the margin.
How do the two body plans of cnidarians differ?
How do the two body plans of cnidarians differ? Poly: sessile, has a cylindrical body with tentacles, first stage of a cnidarian. Medusa: has a motile, bell shaped body with a mouth on the bottom.
What are 5 characteristics of coelenterates?
General characteristics of Phylum Coelenterata
- Kingdom: Animalia.
- Habitat: aquatic, mostly marine.
- Habit: solitary or colonial.
- Symmetry: radially symmetrical.
- Grade of organization: tissue grade of organization.
- Germ layer: diploblastic, outer ectoderm and inner endoderm.
What are the general characteristics of phylum cnidarians?
Characteristics of Cnidarians
- They are characterized by stinging cells called Cnidoblast and a cavity called coelenterates, justifying the name Cnidaria or Coelenterata.
- They are exclusively aquatic and marine.
- They are radially symmetrical and diploblastic animals.
How is the body wall of coelenterates?
Body wall of coelenterates is diploblastic. It is made of inner endoderm and outer ectoderm. Two layers are divided by mesogloea.
Does Coelenterata have body cavity?
Coelenterates have an open body cavity called the gastrovascular cavity. It is not a true cavity. The space present between the body wall and the gut wall is called ‘body cavity. ‘ A body cavity lined by mesoderm is called ‘coelom’.
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