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why are the differences between coelenterata and platyhelminthes not shown in the flowchart in the textbook nor in the one in meritnation ?

why have both of them been written together? does that show they are of similar kind ? how can a stranger to biology be able to understand that both the phylums are different ? thank you if the experts could please answer my query.

The flow chart depicts that both these phyla are acoelomate i.e. they do not have a body cavity. However, they are different from each other in other characteristics. The flowchart is made on the basis of main characteristics which divide the phyla from each other. 

You can compare their features by referring to the study material of the chapter "Diversity in Living Organisms"

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Coelentrata:

Coelentrata is bilatrially symmetrical and triploblastic. They do not have a coelom. So, they do not have good organ level organisation and unable to form organs. They are very basic organisms.

Plathyhelminthes:  

Plathyhelminthes has a true coelom and is billatrially symmetrical and triploblastic. They are the most complex of porifera and colentrata. They are long and flattened dorisventally meaning top to bottom.

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But, this was not my question on the whole.

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hey riju , most of the animals belonging to the category of coelentrates are radially symetrical and they are biploblastis not triploblastic . biploblastic means 2 layers of cell . Inner layer endoderm and outer layer ectoderm and triploblastic means 3 layers of cell that is ectoderm , mesoderm ( middle layer of cell ) and endoderm . so , get to clear to what u have psted .

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