✅ Parent Info:
▪ Parent body length: Male 64.4mm / Female 42.3mm(A), 43.0mm(B)
▪ Number of eggs laid: 13 ▪ eggs / 17 ▪ L1 larvae / 26 ▪ L2 larvae
▪ Substrate used for laying: LB Flake Soil
▪ Oviposition setup temperature: 22–25°C (71–77°F)
✅ Life Cycle:
▪ Larval rearing temperature: 20–26°C (68–79°F)
- Kinshi rearing requires low temperatures of around 19–22°C (66–72°F)
▪ Incubation period of eggs: Approximately 1 month
▪ Survival rate from hatching to L2: 85%
▪ Substrate used for larvae: LB Flake Soil
▪ Amount of flake soil used per larva: Male 15L (4 gallons) / Female 3.8L (1 gallon)
▪ Larval period: Male 10–15 months, Female 4–7 months
▪ Max larva weight: Males 67g, Females 17g
▪ Pupal period: 20-60 days
▪ Max pupa weight: Males 41g, Females 9g
▪ Inactive periods: 2-3 months
▪ Maturity period: 3-5 months after inactive periods
(It depends on the individual and its size, the larger they are, the longer it takes)
▪ Life span of adult: 12-18 months
▪ Max adult body length: Males 96.5mm, Females 51.0mm
▪ Bekuwa CB Guinness record: 110.3mm
Out of the 14 male Dorcus titanus yasuokai that have emerged so far, 10 have successfully eclosed at over 90mm.
In males, the conversion rate from larval weight to pupal weight is about 60–70%, reflecting a reduction of roughly 30–40%.
Assuming there are no significant wandering symptoms, larvae with a final weight of 50g or more can be expected to produce adults exceeding 90mm.
Most females completed their development to adulthood in about five months, with a relatively short larval period of 3–4 months.
Their final larval weights were approximately 14–17g, and adult body lengths ranged from about 47 to 51mm.
With low-temperature rearing or kinshi-based rearing, it seems quite possible to reach 20g.
Generally, the final weight of DTY male larvae is around 50–60 g, but recently in Japan, larvae weighing over 100 g have been produced. As of October 2025, the latest CB Guinness record is 110.3 mm from the "KDS lineage".
3 months after hatching - Male
5 months after hatching - Male
7 months after hatching - Male
Size of larval frass
Male pupa
Female pupa
LBDTY F2 -1 (Left): 96.11mm
LBDTY F2 -2 (Right) 95.18mm
LBDTY F2 -5: 96.50mm
LBDTY F2 -6 (Left): 93.15mm
LBDTY F2 -7 (Right): 91.47mm
LBDTY F2 -8 (Left): 90.61mm
LBDTY F2 -9 (Right): 90.46mm
LBDTY F2 -11 (Right): 91.23mm
LBDTY F2 -12 (Left): 90.99mm
LBDTY F2 -14 (Right): 88.70mm
LBDTY F2 -3: 94.13mm
Although it's more common in older adults, some beetles lose their legs or tarsi shortly after emergence. In rare cases, it’s due to improper hardening during the emergence process.
LBDTY F2 -4: 67g
The most promising larva with a final weight of 67 g, was found dead inside the pupal chamber.
The pupa showed no signs of injury and was in very clean condition; the moisture observed on the surface suggests suffocation as the probable cause of death.
LBDTY F2 -13
The larva's weight had been steadily dropping from 20g, and the final recorded weight was just 13g, It successfully constructed a pupal chamber on May 30, but unfortunately, it was found dead inside the chamber on June 8.
LBDTY F2 -15: 83.15mm
He has a misaligned Head-Thorax. A properly hatched beetle has its head, thorax, and abdomen in a straight line. Occasionally, during emergence, the head may become stuck in an angled position and harden. This is rare, but it seems to occur mainly in Dorcus species.
🔥 Experimental Group:
No. 15, 16, and 17 were raised using a layered substrate half Kinshi and half LB Flake Soil during their 4th and 5th substrate changes. While each larva showed different preferences between the two layers, the results were noticeably poorer compared to those raised solely on LB Flake Soil, likely due to the introduction of Kinshi too late in their development.