mammaliaformes

Castorocauda lutrasimilis catching breakfast. I’m not sure about the hind leg, but I was too lazy to change it.

Castorocauda was a semi-aquatic docodont that lived about 164 million years ago, during the Jurassic period, in what today is Inner Mongolia. It was a piscivore, that also supplemented its diet with invertebrates.

It was mammaliaform, but not a mammal.

It could reach a little over 40cm in length, and between 500 to 800g in weight.

The name Castorocauda lutrasimilis means beaver-tail similar to otter.

The holotype preserves extensive coat of fur, and also small scales/scutes on the tail. The tail was also covered in sparse hair.