Harlequin Crested Gecko
The Harlequin is a pattern trait of the crested gecko (Correlophus ciliatus), one of the most popular pet lizards in the hobby.
🗓️ Last reviewed: July 2026
Overview
The Harlequin is a pattern trait of the crested gecko (Correlophus ciliatus), one of the most popular pet lizards in the hobby. It is not a species or a separate animal, but a description of how boldly the pattern spreads across a gecko's body. Harlequin geckos are prized for their strong contrast and busy markings.
What it is
A wild-type or "normal" crested gecko usually shows pattern mostly along its back, with plainer flanks. A Harlequin carries much heavier patterning that extends down the sides and often onto the legs, creating a striking, high-contrast look. The term describes the amount and placement of pattern, not a specific colour.
The genetics
Harlequin is a polygenic, line-bred trait, not a simple Mendelian gene. That means it is not inherited as a clean recessive, dominant, or incomplete-dominant switch, and there is no single "Harlequin gene" that is either on or off. Instead, many genes together influence how much pattern a gecko expresses, and breeders concentrate that expression over generations by selecting the most heavily patterned animals to reproduce. Because it is polygenic, offspring fall along a range rather than into tidy predictable ratios.
Appearance
A strong Harlequin shows bold, contrasting pattern that reaches well down the flanks and commonly extends onto the legs, sometimes with cream, orange, red, or yellow markings against a darker base. Crested geckos also "fire up" and "fire down", so contrast can look far more intense at night or when the animal is active and more muted when resting. Like all crested geckos, juveniles often change as they mature, and the final adult pattern and contrast may differ noticeably from how a hatchling first looked.
How it is bred
Simple recessive traits need two copies to show and can hide in unaffected "het" carriers; dominant and incomplete-dominant traits show with a single copy. Harlequin works differently. As a line-bred, polygenic trait it is produced by picking the best-patterned parents and breeding them together across multiple generations, gradually pushing the pattern further down the sides. It can also be stacked or combined with colour and pattern traits (for example Harlequin with a particular base colour or with additional pattern types) to build more complex combos.
Cost and availability
Crested geckos are widely available and generally affordable as a species. Harlequins are common in the hobby, with price depending on the quality and extremeness of the pattern, the colours involved, and whether the trait is combined with other sought-after looks. Cleaner, more extreme, well-defined Harlequins command higher prices than lightly patterned ones.
Health and ethics
Harlequin is a cosmetic pattern trait and carries no known health or welfare problem of its own, unlike some crested morphs (for example the Lilly White, which is linked to a lethal super form, or Scaleless animals that lack normal scales). A Harlequin gecko is simply a normally healthy crested gecko with a lot of pattern. As with any reptile purchase, choose reputable, transparent breeders and consult a qualified reptile (herp) veterinarian for any health questions.
Care
Care is exactly the same as for any standard crested gecko - the Harlequin trait changes appearance only, not the animal's needs. This profile is educational and not a full husbandry guide, so use reputable crested gecko care resources and a herp vet for setup, diet, and health.
Harlequin Crested Gecko - frequently asked questions
Is Harlequin a recessive or dominant morph?
Neither. It is a polygenic, line-bred trait, so it is not carried or inherited as a single recessive or dominant gene.
Will two Harlequins always produce Harlequin babies?
Not guaranteed. Because it is polygenic, offspring vary in how much pattern they show, though pairing strong Harlequins improves the odds of well-patterned young.
Does the Harlequin trait affect the gecko's health?
No. It only changes appearance and needs the same care as any crested gecko, with no special health problems tied to the trait itself.
Why does my Harlequin look different from day to night?
Crested geckos fire up and fire down, so pattern and contrast can look much bolder when the gecko is active and more muted when it is resting.