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Why is a starfish a vertebrate?

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Eh? Starfish are echinoderms which are almost nothing at all like chordates, of which vertebrates are a subtype. read more

“Invertebrate” refers to any animal that doesn’t have a spinal column or backbone. Starfish have no backbone, or bones at all for that matter (although they do have a sort of internal skeleton composed of calcium carbonate), so they fall into the category of invertebrate. read more

No. A starfish has a hard shell and its inside is only organs. To be considered a vertebrate the starfish would need a spine and an internal skeleton (not to mention a head). They are, therefore, classified as invertebrates. read more

Starfish are echinoderms which are almost nothing at all like chordates, of which vertebrates are a subtype. But both echinoderms and chordates are deuterostomes - when the embryo develops into ball of cells, the first opening formed in that ball eventually becomes the anus. read more

They are invertebrates but evolutionarily they are the closest invertebrate plum to the vertebrates. They are the one invertebrate phylum that develops the mouth as the second opening during development and the anus as the first - like vertebrates they are deuterostomes. read more

No. A starfish has a hard shell and its inside is onlyorgans. To be considered a vertebrate the starfish wouldneed a spine and an internal skeleton. read more

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