Speciosus Deer Stag Beetle
The Speciosus Deer Stag Beetle is the largest-growing member of the deer stag beetle group. It is found mainly in Thailand, with populations from Myanmar also classified under this subspecies. Its most striking feature is the deep tortoiseshell-colored pattern across its back, giving it a distinctive look not seen in other stag beetles. Because it calls for some experience with temperature control and substrate choice, it is generally considered suited to intermediate keepers. With a lifespan of roughly six months to a year, watching it develop from larva to adult is part of the appeal. Combining a powerful mandible shape with a settled presence, it's a natural next step for anyone who has grown comfortable keeping stag beetles.
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Speciosus Deer Stag Beetle key facts
- Care level
- Intermediate
- Lifespan
- Six months to a year
- Size
- Captive record 72.2mm, wild record 70.0mm
- Diet
- Adults take the sap of broadleaf trees and beetle jelly; larvae are reared in mycelium bottles made from beech or konara oak
- Temperature & Humidity
- No published figures for rearing temperature or humidity could be found for this species, so none are given. It is a beetle of mainland Southeast Asia, and the further south the population the clearer its markings tend to be. Do not let the mycelium bottle or the egg-laying log dry out.
- Breeding & Egg-laying
- Rhaetulus lays into rotten wood at ground level, and the larvae can be reared in mycelium bottles. They do not take to sawtooth oak, however, and are said to grow largest on oyster-mushroom mycelium made from beech or konara oak. The cycle from egg to adult takes about a year. The captive record stands at 72.2 mm.
- Cohabitation
- Most species in the genus are short-tempered but not deeply committed fighters, and one will withdraw of its own accord if a fight drags on. Even so the adults are kept singly and are put together only for pairing.
- Lifespan & Rearing Period
- Adults live six months to a year and the cycle from egg to adult takes about a year. Allow for the dormant period between eclosion and the start of activity when planning a pairing.
- Health & Notes
- Its rank is treated differently by different sources, some placing it as a subspecies of R. crenatus and others as a full species. Do not cross or house it with the Taiwanese form, which under the first treatment is a subspecies of the same species. Importing live Scarabaeoidea requires the species identification certificate.
About Speciosus Deer Stag Beetle
An introduction to the Speciosus Deer Stag Beetle, the largest of the deer stag beetles. Found in Thailand and Myanmar, it's known for its deep tortoiseshell markings and suits intermediate keepers.
7 things to know before welcoming a Speciosus Deer Stag Beetle
1Grows Quite Large
Captive-bred records reach 72.2mm and wild records reach 70.0mm, making it one of the largest deer stag beetles. Actual size varies by individual, shaped largely by care during the larval stage.
2Rich Tortoiseshell Pattern
The tortoiseshell-colored pattern on its back varies in intensity from beetle to beetle. Even within the same species, no two individuals look quite alike.
3Suited to Intermediate Keepers
Keeping this species well calls for some understanding of temperature and substrate management. First-time keepers may want to build up basic experience before taking one on.
4Lives Six Months to a Year
Adults typically live around six months to a year. Keeping the environment at a stable temperature helps them settle in comfortably.
5Native to Thailand and Myanmar
It is found mainly in Thailand, with Myanmar populations also included under this subspecies. Managing temperature and humidity with its native climate in mind is the basis of good care.
6Get Your Setup Ready
Have basic supplies on hand before bringing one home, such as insect substrate, a climbing branch, and a suitable case. It also helps to confirm you have a spot with a stable temperature.
7Handle the Mandibles with Care
Males have powerful mandibles, so take care not to get pinched when handling them bare-handed. Using tools for handling is worth considering until you're used to the species.
Frequently asked questions about Speciosus Deer Stag Beetle
- Q.How big does the Speciosus Deer Stag Beetle get?
- A.Captive-bred records reach 72.2mm, and wild-caught records reach 70.0mm. It's known as one of the largest species among the deer stag beetles.
- Q.Can beginners keep this species?
- A.It's generally considered suited to intermediate keepers. Building up some basic stag beetle keeping experience first will help you care for it with more confidence.
- Q.How long do adults live?
- A.Adults typically live around six months to a year after reaching maturity. This can vary somewhat depending on the individual and the care environment.
- Q.Is it aggressive or difficult to handle?
- A.Its mandibles are powerful, but it isn't especially more aggressive than other large stag beetles. Even so, take care not to get pinched when handling males.
- Q.Does the coloring or pattern vary between individuals?
- A.The intensity of the tortoiseshell pattern on the back varies from beetle to beetle. Part of the appeal is that even within the same species, each individual has its own distinct look.
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Care difficulty, lifespan, size and diet — all basics covered.
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