Okinoerabu Saw Stag Beetle

Okinoerabu Saw Stag Beetle key facts

Care level

Intermediate

Lifespan

Adults live two to three months in the wild

Size

Males 27.5-69.0 mm (including captive; the wild record is 64.5 mm) / females 24.5-30 mm

Diet

Sap of broadleaf trees such as Mallotus, Machilus and Castanopsis; beetle jelly

Temperature & Humidity

Although it comes from subtropical islands, keep it like the mainland Japanese saw stag. Avoid extreme cold in winter and keep the substrate moist enough to clump when squeezed. Larval substrate does best kept on the damp side.

Breeding & Egg-laying

She lays in substrate, but along the walls and floor of the box or against a log rather than in the middle of it. Pack black soil or fully fermented fine substrate firmly. Eggs hatch in about a month and larvae take one to two years. Slightly damp fermented substrate suits them best; fungus bottles work but offer little advantage.

Cohabitation

Males are very aggressive: where the mainland saw stag mostly postures, this group grabs straight away. Females are often killed during pairing, so keep the beetles singly, house them together only a few days and separate them once mating is seen.

Lifespan & Rearing Period

Adults live two to three months in the wild. They fly from mid-June to early September; the larva builds a pupal cell in spring, pupates in about a month and emerges about a month later. In captivity beetles that emerge by August become active after some two months, while later ones usually stay dormant even under temperature control.

Health & Notes

Males of this group cannot chew an exit hole through wood, so the larva usually leaves the log and builds its pupal cell in the soil; give it a deep layer of substrate. The subspecies are separated island by island, so never release captive beetles or cross stock from different localities.

About Okinoerabu Saw Stag Beetle

A subspecies of the Amami Saw Stag Beetle found only on Okinoerabu Island, known for its dark brown head and bright orange elytra. Best suited to intermediate-level keepers.

7 things to know before welcoming a Okinoerabu Saw Stag Beetle

1. 1Endemic to One Island

   This beetle is a subspecies of the Amami Saw Stag Beetle, found only on Okinoerabu Island in Kagoshima Prefecture. Keep in mind you're caring for an insect unique to this single island population.

2. 2Striking Color Contrast

   The dark brown head and pronotum set against bright orange elytra is this beetle's signature feature. Individual coloring can vary slightly, which makes each beetle fun to observe.

3. 3A Slender Build

   Compared to other saw stag beetles, this species has a notably slim body. Its mandibles are also more delicately shaped than those of many relatives.

4. 4Watch the Mandible Teeth

   Even large adults retain a small inner tooth at the base of the mandibles. It's a detail worth checking both before you bring one home and as you watch it grow.

5. 5A Short Adult Lifespan

   In the wild, adults typically live only about 2 to 3 months. Once yours arrives, set up a good environment quickly so it can make the most of that limited time.

6. 6Best Suited to Experienced Keepers

   This species is considered intermediate-level, requiring basic knowledge of temperature, humidity, and feeding routines. First-time beetle keepers may want to build up some experience before taking one on.

7. 7Prepare the Habitat in Advance

   Before bringing one home, set up a stable spot away from temperature swings along with suitable substrate and a perch. A calm, well-prepared habitat helps your beetle make the most of its short active period.

Frequently asked questions about Okinoerabu Saw Stag Beetle

Q.What kind of beetle is the Okinoerabu Saw Stag Beetle?

A.It's a subspecies of the Amami Saw Stag Beetle found only on Okinoerabu Island in Kagoshima Prefecture. It's known for the contrast between its dark brown head and pronotum and its bright orange elytra, and even large adults keep a small inner tooth at the base of the mandibles.

Q.Is this species suitable for beginners?

A.This species is considered intermediate-level rather than beginner-friendly. Having some basic knowledge of temperature and humidity management makes for smoother care.

Q.How long do adults live?

A.In the wild, adults typically live around 2 to 3 months. Lifespan in captivity can vary by individual, so it helps to keep an eye on your beetle's condition day to day.

Q.How large does this beetle grow?

A.Males typically range from 27.5 to 69.0 mm, while females range from about 24.5 to 30 mm. The largest wild-caught record is 64.5 mm.

Q.How does it differ from the Amami Saw Stag Beetle?

A.This beetle is a subspecies of the Amami Saw Stag Beetle, and its main distinction is being restricted to Okinoerabu Island in Kagoshima Prefecture. Subtle differences in coloring and body shape also set it apart.

Useful tools for Okinoerabu Saw Stag Beetle care

Learn more about Okinoerabu Saw Stag Beetle in the encyclopedia

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