Castorocauda
= Castorocauda
{c}
A Middle <Jurassic> mammaliaform with aquatic adaptations and preserved integument. The <fossil> supplies a minimum occurrence for a fur-bearing covering, not the exact origin date of <endothermy>. <A swimming mammaliaform from the Middle Jurassic and ecomorphological diversification of early mammals by Qiang Ji and others>[Science 311, pp. 1123–1127; Castorocauda skeleton and preserved integument]{ref}