Dorsalis saw stag beetle

Dorsalis saw stag beetle key facts

Care level

Intermediate

Size

Captive records 57.8mm (male, nominate), 73.0mm (male, hiromii), 40.6mm (female)

Diet

Adults take beetle jelly; larvae eat rotten wood and fermented substrate

Temperature & Humidity

There is little numeric temperature data. Avoid extremes of heat and cold and keep the substrate from drying out.

Breeding & Egg-laying

The genus has a life cycle close to Dorcus, with larvae growing on rotten wood and humus. Provide fermented substrate or a laying log.

Cohabitation

Males are combative, so keep adults singly and together only for mating.

Lifespan & Rearing Period

Larval duration and adult lifespan are poorly documented.

Health & Notes

The nominate form and hiromii differ greatly in size, so confirm subspecies and locality and keep lines separate. Importing foreign stag and rhinoceros beetles is regulated by the Plant Protection Act and the Invasive Alien Species Act (species-name certificate), with each species needing clearance from the Plant Protection Station, so domestically bred stock is the safe choice. Never release captive beetles.

About Dorsalis saw stag beetle

Dorsalis saw stag beetle from the Philippines, known for size-dependent mandible shapes and two named subspecies. An intermediate-level species valued for its striking size difference between sexes.

7 things to know before welcoming a Dorsalis saw stag beetle

1. 1Mandibles Shift with Size

   The most distinctive trait of this species is that a male's mandible shape changes with his body size. Small and large males can look almost like different species, which makes comparing individuals part of the appeal.

2. 2Two Recognized Subspecies

   BE-KUWA lists the nominotypical subspecies separately from subspecies hiromii, with hiromii tending to grow larger. It's worth confirming which subspecies you're getting before bringing one home.

3. 3A Striking Size Gap Between Sexes

   This species is known for the large size difference between males and females. The captive record for females is 40.6mm, well below the male records (57.8mm for the nominotypical subspecies and 73.0mm for hiromii). Actual size varies from individual to individual.

4. 4Best Suited to Intermediate Keepers

   This species is generally considered suitable for intermediate-level keepers. Some prior experience with other stag beetles helps with day-to-day care and observing how the mandibles develop.

5. 5Lifespan Data Is Limited

   Reliable lifespan data for this species is still scarce, so there's no well-established benchmark to plan around. It's best to care for each individual based on its condition rather than assuming a fixed lifespan.

6. 6Basic Habitat Upkeep

   A cluttered or overly dry enclosure makes it harder to keep an eye on your beetle's mandibles and condition. Checking the substrate regularly and keeping the enclosure clean is the core of everyday care.

7. 7What to Check Before Bringing One Home

   Before acquiring one, it helps to check which subspecies you're getting — nominotypical or hiromii — and take a look at the male's mandible shape. Since this is an intermediate-level species, brushing up on basic care knowledge beforehand is a good idea.

Frequently asked questions about Dorsalis saw stag beetle

Q.Why do males' mandibles look so different between individuals?

A.This species' males have mandibles whose shape shifts along with body size. As a result, small and large individuals can look strikingly different from one another, even though they're the same species.

Q.What's the difference between the nominotypical subspecies and hiromii?

A.BE-KUWA records them as separate forms, and subspecies hiromii tends to reach a larger size. Captive-reared records reflect this too — 57.8mm for the nominotypical subspecies versus 73.0mm for hiromii.

Q.How long does this species live?

A.Lifespan data for this species is still limited, so there's no firm figure to point to. It's best to care for each beetle based on how it's doing rather than a set number of years.

Q.Can a beginner take on this species?

A.This species is generally regarded as suited to intermediate keepers. Having cared for other stag beetles beforehand makes day-to-day management and health checks easier to handle.

Q.How much do males and females differ in size?

A.According to BE-KUWA captive records, males have reached 57.8mm in the nominotypical subspecies and 73.0mm in hiromii, while the female record is 40.6mm. These are maximum records, so typical individuals are smaller and size varies.

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