Hungary's first
scientific site about Boa constrictors

By locality:

Boa c. amarali

(Stull, 1932)

Distribution area: Southern Brazil, Eastern Bolivia, Northern Paraguay.

Appearance of amarali subspecies- just like in case of other subspecies -can be highly variable. Depending on the habitat, its altitude and climate, the background color can be yellowish brown, light,- silver,- dark grey. Boa c. amarali is known to occur in forestal, swampy and mountainous regions.

In the tail area dorsal blotches are relatively small (Boas with large red tails are definetly not amarali, or not the ones that Stull once described, at least!). The tail seems to be short compared with other subspecies, therefore Boa c. amarali are often called as "Short-tailed boa". They are also known as Amaral's boa.

Interestingly, some speciemens of Brazilian Boa c. constrictor from Southeastern populations are showing some resemblances to Boa c. amarali. There will be further field studies needed in the future to clear this matter up.
Number of dorsal blotches are 22 or more. The ventral surface is usually blurred gray with more or less orange and pink hue.
Boa c. amarali are stumpy bodied snakes, but they are also smaller than Boa c. constrictor. Adults are about 1,6-1,8m (6 ft) in length.

Although sellers often labels certain Boa c. amarali as "Bolivian boas" (especially in the U.S.), we are sceptical about the true origin of these animals. This is because we have seen hundreds of South Brazilian boas from Sao Paulo region and they looked just the same like so-called "Bolivian boas". It is hardly imaginable that boas from 1000 kilometers away from Sao Paulo region, in a different enviroment, in a different biotop would look just the same. Also, animals we have seen from Bolivia so far, were all very different from animals labeled as "Bolivian boas" in the US. We suppose that "Bolivian boas" kept in the US had actually been collected from region of Sao Paulo, and than were shipped through Bolivia to enter the US (Brazil was closed for export at that time). Therefore, taxon "Bolivian boa" will be described as South Brazilian boa on our site.

However, Bolivian populations of Boa constrictors are among the poorest documented ones, we have almost no useful information on them- with an exception of some photos -,so these forms will remain unknown for sometime.

To be even more complex, I have to also mention that boas known as "South Brazilian boas, Boa c. amarali" in captive collections in the US are very different from populations occuring in South Brazil. These boas are closer related to Boa c. constrictor than Boa c. amarali anyway and they certainly come from a different region in Brazil (Central Brazil most likely). If you want the learn more about this taxa, please click here .

Nevertheless, it does not matter how we call a form in captivity, "Bolivian boa" or "South Brazilian boa" as long as we keep the bloodlines and localities pure (even the unknown ones).

Head details of "silverback" Boa c. amarali

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1.1 CB 2007 Argentine boas

(Boa c. occidentalis)details..