Phalacrognathus muelleri (rainbow stag beetle)

The rainbow stag beetle ( Phalacrognathus muelleri ) is one of the most spectacular and sought-after species in the beetle world. Native to northern Queensland, Australia, and New Guinea , but bred in Spain, this beetle is noted for its incredible metallic iridescence, with shades ranging from green, red, blue, and purple , depending on the light. Its striking appearance and behavior make it one of the most sought-after species among insect enthusiasts.

🔍 Highlighted Features.

✅ Size: Males can measure up to 70 mm , while females usually do not exceed 46 mm .
✅ Coloration: Its shiny, metallic shell reflects different colors depending on the angle of the light, with green being the most common.
✅ Life expectancy: Adults can live up to 18 months , which is quite long compared to other species.

🌿 Habitat.

🔹 Natural environment: It lives in humid tropical forests, where the larvae develop in decaying wood with fungi.
🔹 In captivity: It is recommended to keep the larvae in flake soil , an ideal substrate for their growth and development (you can also find it on our website).

🍌 Food.

🔸 Larvae: Flake soil.
🔸 Adults: Eat ripe fruits such as banana, pear or mango and gelatin.

🐞 Reproduction and Life Cycle

🔹 Females can lay up to 50 eggs , which hatch in approximately 10 to 14 days .
🔹 The larvae go through several stages of development (L1, L2 and L3) over a period of several months before pupating.
🔹 After completing the metamorphosis, they emerge as adults with their characteristic metallic shine.

🏡 Captive Care

✅ Terrarium: A spacious container with flake soil substrate is recommended for larvae and a firmer substrate for adults.
✅ Temperature: Keep above 25°C for optimal development.
✅ Humidity: It is important to maintain an adequate level of humidity to promote the larval phase.

✨ A Collectible Beetle

The Phalacrognathus muelleri is a true gem in the beetle world. Its combination of stunning coloration, longevity, and ease of maintenance in captivity makes it ideal for both beginners and advanced collectors.