Fruhstorfer's Golden Stag Beetle

Fruhstorfer's Golden Stag Beetle key facts

Care level

Advanced

Lifespan

Adults 3-6 months

Size

Males up to 55.0 mm (captive record)

Diet

Beetle jelly

Temperature & Humidity

Even within the genus it is especially heat-sensitive and needs strict temperature control matching its high-altitude origin. Keep it cool in summer. High humidity darkens the gold.

Breeding & Egg-laying

Use Trametes (kawara) fungus wood or bottles for egg laying and larvae. Set-ups that work for babai often fail, and it is the hardest golden stag to breed.

Cohabitation

Keep singly and pair only briefly. Northern Borneo and southern Kalimantan stock differ in colour, so do not mix localities.

Lifespan & Rearing Period

Being rare and expensive, it leaves little room for error.

Health & Notes

The golden colour changes with humidity, so a darkened beetle is not sick. Purity of captive lines has been questioned and hybridisation with moseri is suspected, so check locality data when buying.

About Fruhstorfer's Golden Stag Beetle

A rare Borneo highland subspecies of the Mollenkamp's Golden Stag Beetle — the smallest and stockiest in its genus, prized by advanced keepers for its scarcity.

7 things to know before welcoming a Fruhstorfer's Golden Stag Beetle

1. 1Advanced-Level Care

   Successful captive breeding examples are limited, so keeping this species calls for genuine experience and knowledge. It's better suited to keepers who already have experience with other stag beetle species than to first-time beetle owners.

2. 2Smallest in Its Genus

   With a recorded maximum male size of 55.0mm, it ranks among the smallest members of the golden stag beetle genus. Despite its compact size, its stocky build and coarsely textured pronotum give it a surprisingly powerful presence.

3. 3Native to Borneo Highlands

   This is a subspecies of the Mollenkamp's Golden Stag Beetle, found in the cool highlands of Borneo. Because of this origin, careful temperature management is important even in captivity.

4. 4Rare in the Wild and in Culture

   Both wild-caught specimens and successful captive-bred lines are scarce, making it the rarest species within its genus. It is not subject to CITES.

5. 5Temperature and Humidity Matter

   Coming from highland habitats, this beetle tends to be sensitive to heat and excess humidity. Ongoing attention to the temperature and humidity of its enclosure is essential for keeping it healthy.

6. 6Best Housed Individually

   Like many stag beetles, adults are best kept one per enclosure rather than housed together. This helps avoid stress and physical injury from encounters between individuals.

7. 7Prepare the Setup in Advance

   Before bringing one home, set up an enclosure where temperature can be controlled, along with suitable substrate and insect jelly for feeding. Choosing a location that stays cool and avoids high humidity will make care much easier from day one.

Frequently asked questions about Fruhstorfer's Golden Stag Beetle

Q.Is this species suitable for beginners?

A.Fruhstorfer's Golden Stag Beetle is considered a species for advanced keepers. Successful captive breeding examples are limited and keeping it well requires specialized knowledge, so it's best to gain experience with other stag beetle species first.

Q.How large does it grow?

A.Males have a recorded maximum size of 55.0mm (a captive breeding record). It's among the smallest members of the golden stag beetle genus, known for its compact, stocky build.

Q.What environment does it need?

A.As a subspecies native to the highlands of Borneo, it needs a cool, stable environment away from heat and excess humidity. Regular attention to the enclosure's temperature and humidity is important.

Q.Can it be housed with other beetles?

A.It should be kept individually. Housing multiple beetles together can lead to conflict between individuals, so each one should have its own enclosure.

Q.Is it subject to any wildlife regulations?

A.Fruhstorfer's Golden Stag Beetle is not subject to CITES. It's considered one of the rarest species within its genus, making it a beetle worth treasuring when you have the chance to keep one.

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