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NTamura's avatar


Castorocauda lutrasimilis was a semi-aquatic early Mammal that lived during the Middle Jurassic of China. It measured about 40 cm. Its tail was broad and flattened like a modern day beaver and his forearms show adaptation for digging similar to a platypus. Dubbed as the "Jurassic beaver" by the press at the time of its discovery, Castorocauda is not related to beaver but belong to a group of primitive and extinct mesozoic mammals called Docodonts.
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Persona22's avatar
Aren't docodonts considered to be Mammaliaformes? As in, not full fledged mammals but mammal shaped?
NTamura's avatar
Yes, they are mammaliaformes...
vinhavatar's avatar
Looks like a good hunting target, judging by the fur!
RedVioletPanda's avatar
Wow, it looks like a otter somewhat. I didn't realize that mammals in the Jurassic had fur like that, sorry if it sounds like a dumb question.

Good work on this, I especially like the lighting and effects in the water.
NTamura's avatar
Mammals certainly had fur by that time. Eomaia for instance has been preserved with fur impressions...
RedVioletPanda's avatar
RoCueto's avatar
That thing looks adorable.

Very good underwater ambientation :ahoy:
toasted-tinapay's avatar
for me, this looks great. ^^
zakafreakarama's avatar
Actually Castorocauda is not considered a true mammal by most scientists, since the docodonta have no modern relatives, and their ear bones differ from those of true mammals. Does it mean Castorocauda is in fact a reptile? Interesting question! :)
NTamura's avatar
Yeah that's right, a mammaliaform, not quite a mammal (neither a therian, nor a monotreme) but not a reptile either. Generally speaking, Synapsids are not considered to be reptiles.
Very intriguing. Well done!
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