Struggling to tell from the picture.

I would say it is possible that it is Phoneutria nigriventer (Brazilian Armed Spider) but even still the red on the back is not something I know in this species. This species is venomous but this is my best guess. More photos would be needed to properly identify the species.

I agree, with the picture is hard to see but as suggested above, I believe it belongs to Phoneutria. The genus is characterized by a prolateral dense 'brush' of hairs (technically called scopula) on the pedipalps (both on the tibiae and tarsi). From what I can tell on the picture, this one may have it. As for the species, even with a well preserved specimen, it is tricky to know and for certainty it is often needed the inspection under the microscope, particularly focusing on the genital structure. Coloration may be useful; however, there is considerable variation and thus is not very reliable. Currently there are eight valid species in the genus with most having a relatively wide distribution. I may be mistaken, but I believe most Phoneutria species may be potentially venomous to humans.

 Dear  Matthew and Jaime,

If it is interesting to you I can try to capture some individual and send them to you.

Thanks for the good and interesting answers.

Regards,

Jose 

Thanks Jose. although interesting, I don't think it would be necessary (at least from my part). After doing a little bit of research, looking at the known distribution of non-amazonian Phoneutria species (Martins & Brescovit 2007) and given the locality (Davinopolis), it looks that it may be P. nigriventer (as suggested by Matthew) or P. pertyi. More than that I cannot tell...

Best,

Jaime

José

It is an "armadeira" (Phoneutria sp.) and thus, potentially dangerous, since they are aggressive. Best,

Rodrigo

Dear Dr. Sozontov,

Thanks for your information.

Regards,

Jose Zanuncio