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The Arthropod Story Table of Contents   

Hallucigenia: A mysterious onychophoran?

By our definition, Hallucigenia was not actually an arthropod. It did not have jointed legs or a segmented body covered in a hard exoskeleton.

Hallucigenia was not an arthropod

However scientists have had a difficult time figuring out exactly what it was. In the 1990s, after studying newly discovered fossils, scientists finally identified Hallucigenia as a close relative of a rare modern animal known as an onychophoran. Onychophorans are probably closely related to arthropods.

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Read the surprising story of how paleontologists eventually identified Hallucigenia: Which way is up? Reconstructing Hallucigenia.