Mniszech's Long-jawed Stag Beetle

Mniszech's Long-jawed Stag Beetle key facts

Care level

Intermediate

Lifespan

Adults 4-6 months (typical for the genus)

Size

Males 21.3-61.7 mm (captive record 61.7 mm; the wild record is 56.0 mm)

Diet

Beetle jelly (in the wild it visits flowers of herbaceous plants)

Temperature & Humidity

Cyclommatus above all dislike stale, humid air. Condensation inside the box is the worst case and shortens life, so keep the container somewhere cool and out of direct sun, and use newspaper or a well-perforated sheet under the lid for ventilation. Mist the substrate when the surface dries out.

Breeding & Egg-laying

Soak a soft log of oak or similar, about 10 cm across, for two hours to a day and strip the bark. Pack 3-5 cm of fine-grained fermented substrate hard in the base, lay the log on it and bury it completely. A female in good condition lays 20-30 eggs. Collect the larvae early, because they cannibalise each other if left too long.

Cohabitation

Keep singly. Hand pairing works once the beetles are mature and mating is easy; the female is far smaller than the male but pairs without trouble. The genus is fairly placid, but females are occasionally killed, so move the male to his own container once mating is confirmed.

Lifespan & Rearing Period

Adults live about four to six months, and larger males live longest. Larvae take three to six months for females and three to ten months for males. Feeding begins two to five weeks after emergence, so wait until the beetle is eating before pairing it.

Health & Notes

Fungus bottles are unsuitable and larvae die in ordinary mycelium. Pack fermented substrate to 80-90 per cent of the container and change it every two to three months. The main reason lines are lost is that the sexes emerge out of step, so deliberately raise some small males to match the females.

About Mniszech's Long-jawed Stag Beetle

A Taiwan-native long-jawed stag beetle known for its head crest and dramatically curved mandibles. Suited to intermediate keepers, with adults typically living around 4 to 6 months.

7 things to know before welcoming a Mniszech's Long-jawed Stag Beetle

1. 1Native to Taiwan

   Mniszech's Long-jawed Stag Beetle is native to Taiwan and is also sold in Japan under the nickname "Tosaka Hosoaka." Its distinctive look comes from a crest-like protrusion at the front of the head.

2. 2Dramatically curved mandibles

   The biggest draw is how large males sweep their slender mandibles back into a dramatic curve. Among long-jawed stag beetles this species stands out for how pronounced that curve becomes as a male matures.

3. 3Size varies by individual

   Male body length ranges from 21.3mm up to 61.7mm (a captive-bred record), with a wild record of 56.0mm. Even within the species, the curve and impact of the mandibles change noticeably with size.

4. 4Adults live a few months

   Adults typically live for around 4 to 6 months, a relatively short span compared to the larval stage. Keeping temperature and humidity stable helps them stay healthy for that limited time.

5. 5Best for intermediate keepers

   This species is considered suitable for intermediate keepers, so some basic beetle-keeping experience is reassuring. Manage them in a case with substrate and anti-tip material, watching out for temperature swings and dryness.

6. 6Handle the mandibles carefully

   Because large males develop long mandibles, take care not to get pinched when handling them. If housing more than one individual together, also consider the risk of the mandibles causing conflict.

7. 7What to prepare in advance

   Before bringing one home, it helps to have the basics ready: a case, insect substrate or climbing branches, a food dish, and insect jelly. Choose a spot away from direct sunlight and sudden temperature swings.

Frequently asked questions about Mniszech's Long-jawed Stag Beetle

Q.Where does Mniszech's Long-jawed Stag Beetle live?

A.It's a long-jawed stag beetle species native to Taiwan. In Japan it's also sold under the nickname "Tosaka Hosoaka."

Q.Can beginners keep this species?

A.This species is considered suitable for intermediate keepers. It's recommended to gain some experience with other beetles first.

Q.How large do males grow?

A.Male body length ranges from 21.3mm up to 61.7mm, a captive-bred record. The wild record stands at 56.0mm.

Q.How long do adults live?

A.Adults typically live for around 4 to 6 months. This can vary somewhat by individual and by keeping conditions.

Q.Are there any legal restrictions on keeping or buying this species?

A.This species is not subject to CITES.

Useful tools for Mniszech's Long-jawed Stag Beetle care

Learn more about Mniszech's Long-jawed Stag Beetle in the encyclopedia

More in this category