SMR Archive

Anerythristic (aka: Anery, Anery A)

This corn snake (originally one word, we usually space between corn and snake) color morph is named from the Latin Anerythristic – loosely meaning no red or yellow pigment. Anerythrism best describes this morph because the most obvious missing color resulting from this genetic mutation is red. Another Latin term applicable to other snake species with this general mutation is axanthic, meaning no yellow pigment. Since red is the most recognized general color common to virtually all wild-type corns, its absence is more readily apparent. Having cited this lack of pigment, adult Anery corns nearly always have noticeable yellow – relegated mostly to the face, neck, and lower sides. The result of the retention of carotenoids attained from their diet, neonate Aneries do not exhibit this yellow – since it gradually accumulates throughout maturity. Adult Aneries that are devoid of yellow color zones are extremely rare in the hobby at this time.

Occasionally, we see Anery corns referred to as black albinos. We intentionally omitted this as an aka (also known as) because it is time for that name to disappear from the hobby, when referring to melanin-rich corn snakes. Modern perceptions of “albino” do not apply to such darkly-colored mutants. Ancient definitions of albino “may” have originally also applied to solid black (melanistic) animals (a common mammalian mutation), but that is now considered a colloquially incorrect term when applied to any wholly color aberrant mutant with obvious black.  I think it is nonsense to call a black snake ALBINO, since the word albino derives from the Greek albus – meaning white (which is the visual consequence of most non-reptile animals that lack color pigment).  Unlike mammals and some other animals whose colors are rendered as variations of their only pigment cell (melanin), albino snakes are often colorful (instead of white) in the absence of melanin – since snakes have color pigments produced by chromatophores AND melanin-producing melanophores.  Black Albino is an oxymoron in the realm of most snakes, and I believe its use in corn snake herpetoculture creates undue confusion.

What to expect:
Hatchling Anery corns are essentially black and white, since carotenoid yellow is slowly acquired from their diet – thereby manifesting slowly – as they mature. Most Anery corns begin to display that yellow around the face and neck between six and 12 months of age, and it spreads tail-ward the rest of their lives – relegated mostly to the sides of the body.

There is a reasonably dependable degree of color distinction between adult male and female Anery corns to tempt us to say that Anery mutants exhibit sexual dichromatism (aka: color dimorphism), but in so much as there are exceptions to this color distinction, the term does not accurately apply. An extreme majority (if not ALL) adult male Anery corns I’ve seen in my life had notably different coloration than their adult female counterparts. Males generally have earth tones (some shade of brown) in their ground color zones, their markings, or both – but a female exhibiting this color feature (without the aid of a separate mutation) is utterly rare. Most adult females are shades of black and gray (not counting carotenoid yellow attained from diet). Bear in mind that I refer to single gene mutant Anerys – since compound morphs can display colors that are attributed to polygenic or mutational traits derived from other genetic contributors. In most cases, male and female adult Anery corns can be visually distinguished at a glance, without the need to probe or compare tail conformation. This photograph is a typical example of this visual color distinction referenced above. This also applies to Ghost corns and some other Anery compound mutants, since they are homozygotes of the Anery gene mutation.  The color distinction demonstrated here does not apply to neonate Anery mutants.

 There are only three males in this group of sub-adult Anery corns produced by Nancy Wimer.

Thank you, Nancy.

Banded Okeetees are a classic example of the promotion of polygenic traits through selective breeding.  By breeding together only Okeetees with saddles that extended down on the sides, after a few generations, we are now reliably reproducing the Okeetees with obvious banded markings.  No part of this genetic product owes its’ appearance to any known mutation.  As it is with most corn snake morphs, no two have the same quality, degree, and volume of banded markings.  

FIRST, what makes Tesseras so expensive? Other than appearance, the primary (and inherent) value of Tessera-type Corns is their mode of inheritance.  Since they are dominant to wild type, pairing any Tessera Type that is a Visual Het to ANY corn snake (other than a Tessera-type) will render 50% Tessera mutants in the F¹ (first) out-crossed generation.  The results of pairing an Tessera homozygote with ANY corn snake (other than a Tessera-type) will render 100% Tessera mutants.

Upon receiving the reverse trio from the seller, we all commented on the mutual peculiarity of the phenotypes.  Most appeared to be the most perfectly Striped Motleys ever seen – in so much as their dorsal stripes were nearly contiguous from neck to tail tip (something never before seen in any corn snake pattern mutant) – but that was hardly possible if the admission of the breeder were true – that they were products of pairing a Striped corn with an Okeetee corn.  How could these descendants of a Striped corn bred to an Okeetee be Motley types, instead of Striped?  It is still unclear if those 2.1 Tesseras were F¹s (first familial generation) or F²s (the originator of this line is now out of the hobby and difficult to reach – for clarification).  If these three Tesseras are F¹s, my deduction is that the striped corn he used in the original pairing was actually Striped AND Tessera.  Even if those three were F²s, the likelihood of the mutant patriarch being a Striped Tessera is strong.