09/16/2026
AXOLOTL FACT: WHAT ARE IRIDOPHORES?
Ever notice that some axolotls seem to sparkle, shimmer, or have tiny golden flecks on their skin? Those little reflective cells are called iridophores!
What are iridophores?
Iridophores are specialized pigment cells that contain reflective crystals called guanine. Instead of producing color like other pigment cells, they reflect light, creating that beautiful metallic, shimmery, or sparkly appearance we see in many axolotls.
Where do you see them?
Depending on the axolotl’s genetics and morph, iridophores can appear as:
• Tiny gold or silver speckles
• A metallic sheen
• Sparkling spots along the body and head
• Shimmering areas around the eyes and gills
Genetics play a big role!
The amount and distribution of iridophores are influenced by genetics, which is one reason two axolotls of the same general color can look completely different!
And here’s a fun fact: iridophores aren’t the same thing as GFP.
GFP (green fluorescent protein) causes certain axolotls to fluoresce under specific wavelengths of light, while iridophores are naturally reflective pigment cells that can create a sparkly appearance.
So the next time your axolotl looks like it’s covered in tiny little stars… ✨
You’re probably seeing iridophores at work!
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