I agree, the lack of information on some of the more uncommon sub-species is frustrating to deal with. Jeff is probably the best person to talk to, at least in the United States. I don't have much information for you, other than that I do know that the Argentinians do not get as large as Brazilians. I believe they only reach 4-5 feet. Mine is almost 2 years old, and his growth rate seems pretty slow (compared to other snakes I've had.) I wouldn't be surprised if he doesn't reach 5' long as an adult. I inquired about the alvarezi in the classifieds, and supposedly Jeff did not produce that one. No idea if the parents or grandparents came from Jeff, though.

Just from personal observation, I've noticed a few more subtle differeces. The heads on Argentinians seem shorter and blunter than those of Brazilians and other subspecies. Also the head striping seems to be consistently different.

Not sure if any of this helps...

Thanks,
Ed

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