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Which invertebrate creature is closest to vertebrates?

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Depends where you draw the line about backbones. Vertebrates are a subset of Chordata, a rather big subset that includes some barely vertebrate beasties like hagfish. The other chordates are tunicates and lancelets. read more

So the invertebrate creature closest to vertebrates is this very nifty larval stage of a boring, stationary filter feeder who circumvented the advent of its adult stage to become an extremely successful and varied phylum that would become fish, dinosaurs, amphibians, reptiles, and of course mammals and humans. read more

The word"invertebrate" comes from the form of the Latin word vertebra, which means a joint in general, and sometimes specifically a joint from the spinal column of a vertebrate. In turn the jointed aspect of vertebra derived from the concept of turning, expressed in the root verto or vorto, to turn. read more

The main difference between vertebrates and invertebrates is that invertebrates, like insects and flatworms, do not have a backbone or a spinal column. Examples of vertebrates include humans, birds, and snakes. read more

Botryllus schlosseri is humans' closest living invertebrate relative. At first glance, Botryllus schlosseri has very little in common with humans. The small sea creature fuses together with others to form colonies that look like psychedelic blobs, encrusting rocks and seaweeds. read more

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