Are my "Ivory Tortoises" really albino tortoises? Are they different from the "Fakes"?
Yes they are albinos and they are very different from the "Fakes". Not to diminish the quality of the nice light spurred tortoise "fakes" but my "Ivory Tortoises" are completely different. I produce hundreds of tortoises that are very similar to the "fakes" (until they start growing and develop new growth that is dark). The "Ivory Tortoises" don't produce the dark growth rings. E-mail me for a picture at richardfife@theriver.com.
Several terms are common place among reptile enthusiasts but have not all made it to the dictionary yet. They are albino, amelanistic, leucistic, and hypomelanistic. All of these terms actually refer to albinistic animals and are all, forms of albinism.
The term albino most often refers to the type of albinism called amelanistic (lacking melanin) or tyrosinase-negative albinism. This means the animal is lacking the tyrosinase enzyme that is involved with the production of melanin. The tortoise will have little or no pigment in the eyes, skin and shell. The shell and skin color is yellow or white and the tortoise has pink eyes.
Leucistic refers to the type of albinism in which the skin and shell are pure white (not yellow or pink), and the iris is blue. Leucistic means white, colorless, or weakly colored. This is Tyrosinase-positive albinism.
Hypomelanistic also refers to the type of albinism that is Tyrosinase-positive. The tyrosinase enzyme is present but not functioning properly. The skin and shell are yellow not white (distinguishing it from a leucistic animal) and the iris is blue, gray, yellow, or brown. Hypomelanistic means less than normal melanin (dark pigment).
It is quite hard to actually determine the color of the iris in my hatchling "Ivory Tortoises". The iris Starts out dark red and shortly turns to a blue or blue/gray. The pupil is black. The shell and skin color is yellow or ivory.
The blue or blue/gray iris is actually a blessing to this desert species. Exposure of pink eyes to the bright sun would certainly be damaging. It is the melanin in the eye that protects the eyes from damage from the sun.
Please e-mail me for a picture of a normal, "Fake", and the "Ivory Tortoise". If anyone can e-mail me with information on how to post a picture to this form I will be happy to post the picture.
Richard Fife


