Turtledove
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Amphioxus

Amphioxus (or lancelets (subphylum Cephalochordata) are a group of primitive chordates. They are an important object of study in zoology as they provide indications about the origins of the vertebrates.

Amphioxus in "The Genetics Lecture"[]

Professor Cthulhu used amphioxus as an example of a primitive creature and how Hox genes determine appearance and ability.[1]

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