RecoveryMorph breeding · September 12, 2026 · 8 min read
Crested gecko morphs: a keeper's guide
Pinstripes, harlequins, Lilly Whites and everything in between — why crested gecko 'morphs' mostly are not single genes, and what that means for pairing.
Crested gecko morphs work differently from snake morphs, and treating them the same is the most expensive mistake in the species. With one famous exception, crested gecko traits are polygenic — the result of selection over generations — so they do not follow Punnett squares.
The vocabulary
- Patternless: an even base colour with little to no marking.
- Tiger: darker banding over the base, often strengthening with age.
- Pinstripe: raised cream or white scales along the dorsal edge; 'full pinstripe' describes unbroken rows.
- Harlequin and extreme harlequin: pattern spreading up the sides, measured loosely by coverage.
- Flame: pale dorsal stripe with plain sides. Dalmatian: spotting, which can be inked in or sparse.
- Lilly White: the exception — a genuine single-gene trait, visually dramatic, and lethal in the homozygous form.
Polygenic means selection, not squares
A harlequin × harlequin pairing does not give you '75% extreme' anything. It gives you offspring distributed around the parents' quality, and you keep the best and breed on. Buying an extreme harlequin buys you a place in someone's selection programme — you still have to run the programme.
This is why our calculator deliberately leaves these traits out of the percentages and prompts you to record them on the animal instead. A fake number is worse than no number.
Fired up, fired down, and photo reality
Crested geckos change colour with humidity, temperature, stress and time of day. The same animal can photograph as two different morphs an hour apart. Judge structure and pattern — pinstriping, coverage, dalmatian spots — not the transient colour.
And a note from our own bug tracker: not every pale gecko is a Lilly White. Whitish flames and light phantoms get mislabelled constantly, by people and, for a while, by our identifier. Lilly White is a gene with a look, not a look with a name.
Lilly White pairings
Because the super form is lethal, the responsible pairings are Lilly White × non-Lilly, which gives roughly half Lilly White offspring. The crested gecko calculator models exactly that and flags the lethal combination if you try it.