amphioxus

Noun
  1. Small translucent lancet-shaped burrowing marine animal;
    Primitive forerunner of the vertebrates (synset 101470445)
    is a type of: cephalochordate - fish-like animals having a notochord rather than a true spinal column
    belongs to: genus amphioxus - type genus of the Amphioxidae
    same as: lancelet

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