Here is one of the first species I encountered. It's a small spiderling in the genus Avicularia, also known as "pink toe" tarantulas. They are recognized by their pink-colored toe pads and are commonly kept as pets.
The genus Avicularia contains the first species described in the infraorder of Mygalomorphae. The species was described by Carl Linnaeus in 1818. The history of the taxonomy of the genus is an insight to the changing of the scientific understanding of arachnids through the last two centuries.
Species in the genus are arboreal, and they build their webs in trees and vegetation as well as human-built structures. They are distributed throughout Central and South America, and the Caribbean.
I am unsure of which instar this spiderling was, but it was about 3-5 cm across. It was scurrying along a wooden foot bridge between the Sacha Lodge boat dock and canoe dock near the banks of the Napo River. The spiderling didn't seem too spooked by me, so I got to take my time with it and get some good shots.
In the near future I'll be adding in some photos of adults too, as there were plenty of them in the Amazon!
