Anerythristic (RDR Black Eye) Boa Constrictors
A visual RDR Black Eye is easy to spot by its jet black eyes, and it keeps its dark, high-contrast colour into adulthood without browning out. It runs smaller than the Colombian type 1 anerys, and whether it is the same gene as the Carbon line is still argued over.
About the Anerythristic (RDR Black Eye) gene
Anerythristic (RDR Black Eye) is a boa constrictor gene that removes red pigment and leaves the eyes solid black. It is one of several separate anerythristic lines in the hobby, and breeding trials have shown two of them, Type 1 and Type 2, to be distinct mutations that are incompatible with each other. An RDR animal comes from a documented line, and its look holds contrast for years without browning out.
Appearance
A visual RDR Black Eye has jet black eyes, with no pupil visible against the iris. As a type 2 anery from Central America, it stays much darker than the type 1 lines, does not brown out with age and runs smaller than the Colombian type 1 animals. The tail carries striping.
Genetics
Anerythristic (RDR Black Eye) is recessive, so a visual needs two copies, there is no super form, and anything else looks like a normal boa constrictor. List a visual as Anerythristic (RDR Black Eye), a proven carrier as Het Anerythristic (RDR Black Eye), and a possible carrier as 66% Het Anerythristic (RDR Black Eye), 50% Het Anerythristic (RDR Black Eye) or Pos Het Anerythristic (RDR Black Eye).
Ralph Davis Reptiles first produced the line in 2001 from two imported Central American type 2 anery boas. It combines with Albino (Sharp) to make Blizzard, with IMG to make Black Devil, and with IMG and Hypo to make Ghost Devil. Whether the newer Carbon line, which also has solid black eyes, is the same gene as RDR is disputed. Neither has a known related trait on record, and on MorphMarket's community forum hobbyists disagree over whether Carbon is simply a phenotypic line of RDR, a claim Carbon's breeder has rejected.