What key feature signifies the Hoiho's classification under the Phylum Chordata?
Answer
Possession of a notochord at some developmental stage
Classification within the Phylum Chordata is based on fundamental embryonic characteristics shared by all members of that phylum, including vertebrates. A key defining feature that must be present at some point during development is the notochord. While feathers, beaks, and egg-laying define the Class Aves, and yellow eye markings define the species' appearance, the presence of the notochord is the feature placing it within the Phylum Chordata, connecting it evolutionarily to fish, amphibians, reptiles, and mammals.
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