What question did this study set out to answer?

The aim is to understand the life history and breeding patterns of the endangered ground beetle Pterostichus isumiensis through controlled laboratory conditions.

April 1, 2026Open Access

Life history of the endangered ground beetle Pterostichus isumiensis Kasahara & Saito, 1997（Coleoptera : Carabidae）deduced from laboratory rearing experiments

KSKôji SasakawaChiba University

Key Points

The aim is to understand the life history and breeding patterns of the endangered ground beetle Pterostichus isumiensis through controlled laboratory conditions.
Rearing the beetles in a lab to simulate seasonal temperature changes
Monitoring egg laying, hatching, and developmental stages
Assessing timings for pupation and adulthood
Eggs were laid in October, hatching occurred in November
Individuals reached the third instar stage by January
Pupation took place in late May, with adults emerging by late June
Evidence suggests that P. isumiensis breeds in autumn

Abstract

SUMMARY The endangered ground beetle Pterostichus isumiensis Kasahara & Saito, 1997 was reared experimentally in a laboratory. Under rearing conditions that simulated seasonal temperature changes through autumn, winter, spring, and early summer, eggs were laid in October, and individuals hatched in November and reached the third （final） instar stage after January of the following year. Pupation occurred in late May, and the adult stage was reached in late June. These results provide definitive evidence for the autumn breeding of P. isumiensis. However, rearing conditions that induce sexual maturity in new adults, particularly temperature, remain to be elucidated.

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