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Lancelets, also known as amphioxus, are small, fish-like marine invertebrates that belong to the subphylum Cephalochordata. They are characterized by their notochord, which extends the length of their body, and they possess a simple body plan that resembles the early ancestors of vertebrates. Lancelets exhibit key features of chordates, such as a dorsal nerve cord and pharyngeal slits, but lack a true backbone. They play an important role in understanding the evolution of vertebrates, as they share common traits with both lancelets and more complex animals.

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