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Rearing research is being conducted to conserve many endangered aquatic Coleoptera species; however, studies on Gyrinidae species are scarce. Herein, we present an efficient rearing method for the endangered species  Dineutus mellyi mellyi  Régimbart,  1882  (Coleoptera: Gyrinidae), practiced at the Ishikawa Insect Museum. The survival rate of the larvae reared using this method at different developmental stages was as follows: first-instar larvae, 100% ( n  = 26); second-instar larvae, 100% ( n  = 26); third-instar larvae, 92% ( n  = 24); landing to pupate, 73% ( n  = 19); pupa, 73% ( n  = 19); and emergence to escape from pupal chamber, 69% ( n  = 18). Therefore, we recommend this method for sustainable ex situ conservation of this species. This method can be generalised to other Gyrinidae and aquatic Coleoptera species.

Rearing method for the endangered species Dineutus mellyi mellyi Régimbart, 1882 (Coleoptera: Gyrinidae)