Nicagus is a genus of stag beetles in the family Lucanidae: representing the monogeneric tribe Nicagini in the subfamily Aesalinae. There are at least three described species in Nicagus, recorded from Japan and North America.
Species These three species belong to the genus Nicagus: Nicagus japonicus Nagel, 1928 - Japan Nicagus obscurus (LeConte, 1847) - United States (from New Hampshire to Iowa and Alabama) Nicagus occultus Paulsen & Smith, 2005 - United States (Texas, New Mexico)
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