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Oldest Ankylosaur Found in Morocco Had Meter-Long Neck Spikes and Early Tail Weapon

A Nature study argues the extravagant armor of Spicomellus afer points to early display behavior in ankylosaurs.

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© Matthew Dempsey
An artistic reconstruction of the Spicomellus after, whose skeleton was covered in spikes, some fused to the animal’s skeleton, measuring as much as 3.2 feet long.
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Overview

  • New, more-complete fossils from near Boulemane confirm Spicomellus afer as the earliest known ankylosaur and the first identified from Africa.
  • The specimen shows spikes fused to every rib and a robust bony neck collar bearing spikes up to about 87 centimeters long, an armor configuration unknown in any other vertebrate.
  • Fused tail vertebrae indicate the handle for a club-like weapon, pushing the origin of ankylosaur tail weaponry more than 30 million years earlier than previously recognized.
  • The partial skeleton, including vertebrae, ribs, pelvic elements and osteoderms, was discovered after flash flooding and has been prepared and catalogued in Fez through UKMorocco collaboration.
  • Project leaders warn of fossil poaching at the site and report suspected Spicomellus bones appearing for sale online, prompting efforts to safeguard the locality and collections.