Journal
ENTOMOLOGICAL SCIENCE
Volume 26, Issue 2, Pages -Publisher
WILEY
DOI: 10.1111/ens.12545
Keywords
Male genitalia; Mitochondrial DNA; Molecular phylogeny; Morphology; Nuclear DNA
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In this study, a Macroplea species was discovered in Aomori Prefecture, Honshu Island, Japan. Morphological and molecular analyses revealed that the discovered individuals were likely M. mutica, although there were some differences observed. This is the second Macroplea species recorded in Japan, and its discovery highlights the need for conservation policies and further distributional surveys.
Wetland biodiversity is currently declining on a global scale. Wetland biodiversity understanding is critical for determining the wetlands' conservation value. In this study, Macroplea Samouelle, 1819 (Coleoptera: Chrysomelidae) was discovered in Aomori Prefecture, Honshu Island, Japan. Only two Macroplea species have been recorded in Japan, M. japana (Jacoby, 1885) and M. mutica (Fabricius, 1792). Macroplea japana had been unrecorded for 60 years before being rediscovered in Honshu Island in 2022, and a single adult M. mutica female was discovered in Hokkaido Prefecture in 2003. The discovered individuals were concluded to be M. mutica based on morphological and molecular analyses. Although morphological differences were observed with the Eurasian M. mutica individuals, the male genitalia was nearly identical to M. mutica. For the molecular phylogenetic analysis based on COI and 28S sequences, Macroplea individuals in Japan were clustered with M. mutica on the Eurasian Continent. This is the first record of this species on Honshu Island (and the second in Japan), as well as the first record of adult males. This species would require conservation policies and additional distributional surveys.
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