I am not sure what the question means.....it needs rewording.
Answer
Chordata and Echinodermata are related, yes, but they are different phyla and so are not synonyms. Chordate and echinoderm are thus not synonymous either.
They are both deuterostomes. ( look that word up; has to do with embryo development. )
chordate phylum
that
The symmetry of the larvae of echinodermata is bilateral.
Being 'chordate' means that the animal has a backbone.
The letters DHCTEORA spell the word chordate (animal of phylum Chordata, including vertebrates)
The phylum Echinodermata which, contains about 6,000 species.
The brittle star belongs to the phylum Echinodermata.
Echinodermata
I do not know to be honest, sorry.
Echinoderms are the phylum. The phylum is Echinodermata Echinoderms are the phylum. The phylum is Echinodermata Echinoderms are the phylum. The phylum is Echinodermata
No. Mollusks are in the phylum mollusca. sea stars, or starfish are in the phylum echinodermata.