The biggest jewel beetle in Korea, Chrysochroa coreana, has been nominated as the Natural Monument No. 496 and also classified as Category I of Endangered Species by the Red Data Book. Due to the invisible feature of a saproxylic larval hood inside the host tree for years, the whole life history was hitherto been unknown to the academic world. In order to clarify the period of larval-hood and record images of the process of the final stage of emergence, we obtained sample eggs from two mated couples of adults that emerged from a dead tree of Celtis sinensis on Wando Island, which is well-known as the habitat of C. coreana. Larvae were hatched on four pieces of timber (Celtis aurantiaca) in July 2018 and kept in a growth chamber under the conditions of 25°C, 65% humidity, and in a 12-hour light/dark cycle. The development of larvae was monitored via the non-destructive C/T method every month. Six adults were emerged between February and March 2024. As a result, we obtained the fact that the larval period of C. coreana is minimum 66 months (5.5 years) under lab conditions.

Scarabaeus typhon has the extensively wide distribution from Europe to the Far East Asia and the extremely similar morphological feature with closely related species. The Korean population of S. typhon had often been confused in its specific status including several misidentifications and synonymous name. By these circumstances, we presumed that there is a possibility to exist potential cryptic species or subspecies, which might be separated between local populations across their distribution range. Therefore, the primary aim of this study was to reassess that the geographical populations of S. typhon can be divided into each other and to establish a sketchy knowledge of its unknown phylogenetic relationships between the relatives using COI gene and comparative morphology. As the result, S. typhon was detected as a single species despite to have the wide distribution and the various intraspecific distances ranging from 0.67% to 3.50%. Two species, S. pius and S. babori were revealed to have two distinct lineages respectively. Among them, two Korean female specimens were detected belonging to group B of S. pius, it is suggested as a cryptic species or subspecies.