We did well with Spinetails on the trip:

Rufous-capped Spinetail (Atlantic Forest endemic)
Spix's Spinetail
Pallid Spinetail (Brazilian Atlantic Forest endemic)
Yellow-chinned Spinetail
Chotoy Spinetail (Pantanal)
White-lored Spinetail (Pantanal)
Rusty-backed Spinetail (Pantanal)