Special requests: Armadillos, Coatis, Spider and capuchin monkey, tamarins, Rhea, Amazonian River dolphin, Green parrots (not macaws), Giant River otter, peccary.
For Spider Monkeys, there is the
Safari Ltd Spider Monkey, which is good but a bit generic.
For Tamarins, this year Papo is releasing a
Golden Lion Tamarin. There is also a
Safari Ltd Golden Lion Tamarin, but I think it is discontinued, so be prepared to dish out a lot on it.
The Safari Ltd version is also out of scale with many of the figures in your display, if that matters to you.
For Peccaries, I would definitely recommend the
Safari Ltd Peccary. It is pretty clearly a Collared Peccary (which is, to my knowledge, a fairly widespread species in Brazil), and it is adequately small for your diorama.
I don't know of any figures (
that are easily avaliable) of Armadillos (

), Coatis, Capuchins, Rheas, Amazonian River Dolphins, Green non-macaw parrots (Safari does make one, but it isn't based on a Brazilian species) or Giant River Otters, but I do wish many of these were made.