First Produced By: Peter Kahl

Aliases: Increased Melanism Gene, Azabache

Issues: N/A

First Produced In: 2007

Availability: Rarest

Last Updated: 2022-06-30

Genetic Calculator

Do you have any suggestions or corrections for this article?
Click here to contribute feedback

Learn About Morphpedia >
Learn About Morphpedia >


The Increased Melanism Gene is a dominant mutation founded by Peter Kahl in 2007.

View More


This melanistic Colombian Boa morph was first produced from a litter of normal looking anerythristic Boas and proved to be genetic by Peter Kahl in 2007. [1]

Peter Kahl- "This is the blackest anerythristic Colombian Boa I have ever seen. Her belly is even solid black. She was produced from a litter of anerythristic boas and she looks totally different than any of the anerythristic born in the same litter. We raised her up and bred her in 2006 to two different Sunglows het Anerythristic and hope to produce a litter from her in June 2006. Could produce the whitest snow boa yet but just the Black Anerythristic itself is awesome.

UPDATE: We bred her in 2006 and 2007 to the same two males. It looks like this is a separate gene entirely. Looks like IMG (increased Melanism gene)as the babies look almost normal when born (you can tell the ones that are going to turn black from birth) and from the first shed start turning black. The litters were from breeding two Sunglow Het Anerythristics to the original Black Anerythristic female (who by the way looked different as a baby but turned almost jet black within a year after birth). Produced from that litter were anerys het albino, ghost het albino, hypo double hets and normal looking double hets. Over a few shed you could see half the babies were turning black even the ghosts, normals, and hypos. Looks like there is a whole different gene associated with this original black anerythristic. Half the ghost are almost solid black same with the hypos and normals. Half the anerythristic in in the litter are now as black as the mother. while the other half of the litter look like normal ghost, anerys, hypos, and normals. CRAZY" [2]

View More



IMG boas are born looking similar to normal boas but with a slightly increased amount of black pigment. This melanistic appearance gradually increases as they mature until they are almost solid black. [3]


The tail follows the same colouration as the rest of the body.

Proven Lines

No known proven lines

Related Traits

No known related traits


View More

Relative Availability