Okinawa Saw Stag Beetle

Okinawa Saw Stag Beetle key facts

Care level

Intermediate

Lifespan

Adults live two to three months in the wild

Size

Males 24-75.1 mm (including captive; the wild record is 71.7 mm) / females 24.5-34 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 Okinawa Saw Stag Beetle

Okinawa Saw Stag Beetle: a subspecies found only on Okinawa and Kouri Islands, known for its gently curved mandibles and dark reddish-brown to black body. Key care points and common questions covered here.

7 things to know before welcoming a Okinawa Saw Stag Beetle

1. 1Native to Okinawa & Kouri

   The Okinawa Saw Stag Beetle is a subspecies of the Amami Saw Stag Beetle found only on Okinawa Island and Kouri Island. Knowing its limited native range helps explain why this population looks a bit different from other saw stag beetles.

2. 2Mandible shape is the key ID

   Males have mandibles that curve gently rather than bending sharply like the nominate subspecies. Even large males keep an inner tooth near the base of the jaw, a useful way to distinguish this subspecies.

3. 3Color ranges dark brown to black

   Body color varies between individuals, from dark reddish-brown to black. The same beetle can look different depending on the lighting, so it's worth observing yours closely to appreciate its particular shade.

4. 4Size varies widely

   Males range from 24mm to over 75mm, while females run from about 24.5mm to 34mm. Because size varies so much, it's worth comparing a few individuals before choosing one to bring home.

5. 5Don't house males together

   Saw stag beetles tend to be somewhat aggressive, and two males kept in the same enclosure may fight. If you're keeping more than one, house them in separate containers as a rule.

6. 6Adult lifespan is short

   In the wild, adults typically live around two to three months. Because this window is limited, it's worth setting up stable temperature and humidity from the start so your beetle can spend that time comfortably.

7. 7Care level: intermediate

   This species is generally considered suitable for keepers with some prior beetle-keeping experience. If it's your first time, brushing up on basic stag beetle care beforehand will help things go smoothly.

Frequently asked questions about Okinawa Saw Stag Beetle

Q.How big does this beetle get?

A.Males range from 24mm up to over 75mm, while females are roughly 24.5mm to 34mm. Individual size varies quite a bit even under similar rearing conditions.

Q.Can I keep two males together?

A.Saw stag beetles are somewhat aggressive, and males housed together may fight. If you keep more than one, it's best to give each male its own enclosure.

Q.How long do adults live?

A.In the wild, adults typically live for about two to three months. Setting up stable temperature and humidity from the start helps them spend that time comfortably.

Q.How do I tell it apart from other saw stag beetles?

A.Look for mandibles that curve gently rather than bending sharply, and an inner tooth retained near the jaw base even in large males. Body color also ranges from dark reddish-brown to black.

Q.Is this beetle good for beginners?

A.It's generally considered suitable for keepers with some prior experience rather than absolute beginners. Learning the basics of stag beetle care beforehand will help things go smoothly.

Useful tools for Okinawa Saw Stag Beetle care

Learn more about Okinawa Saw Stag Beetle in the encyclopedia

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