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Austroplatypus incompertus
''Austroplatypus incompertus'' is a species of ambrosia beetle belonging to the weevil family, native to Australia, with a verified distribution in New South Wales and Victoria. It forms colonies in the heartwood of ''Eucalyptus'' trees and is the first beetle to be recognized as a eusocial insect. ''Austroplatypus incompertus'' is considered eusocial because groups contain a single fertilized female that is protected and taken care of by a small number of unfertilized females that also do much of the work.〔^"Sociable Beetles;". Nature 356 (6365): 111–110. 1992. Bibcode:1992Natur.356R.111.. doi:10.1038/356111c0. edit〕
==Description and lifecycle==
The egg of ''A. incompertus'' is about 0.7 mm in length and 0.45 mm wide. It develops through five instars and its head grows from around 0.3 mm wide in the first instar to 0.9 mm wide in the fifth instar. It then pupates and emerges as an adult - 6 mm long and 2 mm in diameter. The adult has an elongated, cylindrical body typical of other platypodines, and displays sexual dimorphism, with males being the significantly smaller sex, an atypical arrangement among platypodine beetles. Females have elytral declivity adapted for cleaning of galleries and defense. Also, only females exhibit mycangia.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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