In both, retia mirabilia are developed in the tail (in spite of its reduction in the Sloths) and in the limbs.
Tamandua has also retia, which are also found in the Spider-monkeys.
But, as is well known, retia are also found in other mammals far removed in the series from these under consideration.
Some of the internal arteries of Whales break up into retia mirabilia.
rete re·te (rē'tē)
n. pl. re·ti·a (rē'tē-ə, rē'shə)
An anatomical mesh, network, or structure, as of veins, arteries, or nerves.