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.

How many classes are there in Coelenterata?

three different classes
Coelenterates are classified into three different classes: Anthozoa. Hydrozoa. Scyphozoa.

What are 5 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 the characteristics of Coelenterata?

Characteristic Features of Phylum Coelenterata. They are multicellular organisms, exhibiting tissue grade of the organisation. They are diploblastic, with two layers of cells, an outer layer called the ectoderm and the inner layer called the endoderm.

What are coelenterates 3 examples?

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.

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 is the meaning of Coelenterata?

Definition of ‘coelenterate’

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. 2.

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 is a coelenterate meaning?

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 is phylum Ctenophora Class 11?

Ctenophora is a phylum of exclusively marine invertebrates. Ctenophora means “comb-bearing”. They are commonly known as comb jellies or sea walnuts. The distinguishing feature of the phylum is the presence of comb plates with cilia that are used for locomotion. They are radially symmetrical and diploblastic.

Why coelenterates are called diploblastic animals Class 9?

Solution : The body of coelenterates have two cell layers with an outer ectoderm, and an inner endoderm. <br> Thus they are called diploblastic animals.

What is Metagenesis Class 11?

Metagenesis is the phenomenon in which one generation of certain plants and animals reproduce asexually, followed by the sexually reproducing generation. Both the forms are diploid in metagenesis hence, it is the false alternation of generation.

Is Coelenterata and Cnidaria same?

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 is triploblastic and diploblastic?

Diploblastic layers are layers consisting of 2 germ layers, i.e. endoderm and ectoderm. Triploblastic layers are layers consisting of 3 germ layers, i.e. endoderm, ectoderm and an extra middle layer called mesoderm.

Where is diploblastic found?

Groups of diploblastic animals alive today include jellyfish, corals, sea anemones and comb jellies.

Which type of body wall is present in Coelenterata?

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 …

Are sponges diploblastic?

However, due to the presence of the two layers of the body wall, sponges are sometimes considered to be diploblastic animals.

What is diploblastic give example?

adjective. Pertaining to a condition in which there are two primary germ layers, such as ectoderm and endoderm. Supplement. Examples of animals that developed from a diploblastic embryo are cnidarians and ctenophores. Word origin: Greek diplóos, twofold + blastikós, budding.

What are 4 examples of triploblastic organisms?

Examples of triploblastic animals include platyhelminthes, annelids, arthropods, molluscs, echinoderms, and chordates.

Are sponges asexual?

Sponges reproduce by both asexual and sexual means. Most poriferans that reproduce by sexual means are hermaphroditic and produce eggs and sperm at different times. Sperm are frequently “broadcast” into the water column.

What are the 3 types of sponges?

The approximately 5,000 living sponge species are classified in the phylum Porifera, which is composed of three distinct groups, the Hexactinellida (glass sponges), the Demospongia, and the Calcarea (calcareous sponges). Sponges are characterized by the possession of a feeding system unique among animals.