Define phylum Echinodermata , hemicordata and chordata in atleast 5 - 6 lines ( no spam pls )
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Echinodermata (the phylum which includes starfish, sea urchins, sea cucumbers, and crinoids) and Hemichordata, form the ambulacraria, the sister taxon of the chordates. The Chordata and ambulacraria form the superphylum deuterostomia, composed of the deuterostomes.
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1) phylum Echinodermata - radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers. The phylum Echinodermata contains organisms that share a specific set of characteristics, including spiny or bumpy skin.
2) The most distinguishing characteristic of the Hemichordates is a more primitive form of notochord, called a stomochord that contained a nerve system.
Characteristics of Hemichordata:
▪︎ Bilaterally symmetrical.
▪︎ Body has more than two cell layers, tissues and organs.
▪︎ Body cavity a true coelom.
3) a large phylum of animals that includes the vertebrates together with the sea squirts and lancelets. They are distinguished by the possession of a notochord at some stage during their development.
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