Possession of which structure places Eunectes notaeus in Phylum Chordata?
Answer
A notochord and a dorsal hollow nerve cord
The Phylum Chordata is a broad grouping reserved for animals that possess a notochord at some point during their development, alongside a dorsal hollow nerve cord, a post-anal tail, and pharyngeal slits (though these are often modified or lost in later stages of snakes). For *Eunectes notaeus*, the presence of these foundational vertebrate structures, even if transient, confirms its placement here, establishing a deep evolutionary tie to fish, birds, and mammals.
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