Pholidocercus

Pholidocercus is an extinct monotypic genus of mammal from the Messel pit related to and resembling the modern-day hedgehog with a single species, Pholidocercus hassiacus.

Like the hedgehog, it was covered in thin spines.

Unlike hedgehogs, it had scales on its head in a helmet-like formation, and had a long, thick, scaled tail.

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Restoration
Pholidocercus hassiacus von Koenigswald and Storch 1983 with partially preserved fur and long, thick, scaled tail. Paratype of the publication