Coelenterata is referred as an obsolete long term encompassing 2 animal phyla, the Ctenophora & the Cnidaria. Coelenterate comes from the Greek word "koilos” referring to the hollow body cavity common to these 2 phyla. Coelenterata have very simple tissue organization, with only 2 layers of cells, external & internal.
The term coelenterate is recognized as scientifically valid, as the Cnidaria & Ctenophora have placed at equal rank under the Metazoa with the other phyla of animals. Cnidaria means "to sting" A single term encompassing these 2 phyla but leaving out all others of equal rank would be considered polyphyletic. However, the term coelenterate is used in informal settings to refer to the Cnidaria & Ctenophora.
In our next blog we shall learn about lysosom I hope the above explanation was useful.Keep reading and leave your comments.
