What are the main characteristics of Coelenterates?

Characteristics. 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 Coelenterata and example?

Coelenterata/Representative species

Which one is an unique feature of Coelenterata?

Coelenterates simply wave their tentacles and when a prey comes in contact, the nematocysts inject the toxin that paralyses or kills the prey. Nematocysts are the most distinguishing feature of this phylum.

What is the basis of classification of Coelenterata?

Classification of Phylum Cnidaria/Coelenterata

The phylum coelenterate is divided into three classes on the basis of development of zooids: Class1: Hydrozoa. Class2: Scyphozoan or Scyphomedusae. Class3: Anthozoa or Actinozoa.

What are 5 characteristics of coelenterates?

They have cavities in their body. The body is radially symmetrical. The digestion is both intracellular and extracellular. The nervous system and the circulatory system is absent.
…
Coelenterates are classified into three different classes:
  • Anthozoa.
  • Hydrozoa.
  • Scyphozoa.

Why is Coelenterata also called Cnidaria?

Coelenterates have specialized cells known as cnidoblasts that bear stinging structures known as nematocysts. These aid in the capture of prey by paralyzing them with a poison injection. They are also known as cnidarians due to the presence of cnidoblasts.

What are the types of coelenterates?

Coelenterata/Representative species

What is meant by Coelenterata?

noun. 1. 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. adjective.

Is Coelenterata an Acoelomate?

Phylum coelenterata comprises of the sea anemones, jellyfish, and corals. Cnidarians are basically radially symmetrical and have tentacles. The body contains a gastrovascular cavity and the body wall is diploblastic. Coelenterata has no separate body cavity or coelom, so it is called Acoelomate.

What are three examples of coelenterates?

Coelenterates are characterized by the presence of a radially symmetrical body and the sensory tentacles present on the mouth. A few examples of animals belonging to the Coelenterata phylum include sea anemones, hydra, sea pens, comb jellies, coral animals, obelia, aurelia, xenia, metridium, and many more.

What is meant by Coelenterata?

noun. 1. 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. adjective.

What is Cnidoblasts in biology?

Cnidoblasts or nematoblasts are stinging cells found in cnidaria or coelenterata. Each of them bears a stinging cell organelle called nematocyst which is used in offence, defence and attachment of the animal.

Is hydra an example of coelenterate?

Hydras belong to the phylum Coelenterata (also called Cnidaria), which includes corals, sea anemones, and jellyfish. Coelenterates are primarily marine animals, but hydras are found in freshwater ponds, lakes, and streams.

What are the types of coelenterates?

Coelenterata/Representative species