Megadromus guerinii

Megadromus guerinii is a species of ground beetle endemic to New Zealand. It was originally described in 1841, although the name given later recognised to be the same as another species, and it was redescribed again in 1865. This moderately sized black beetle is only found on Banks Peninsula, where it is common, occurring in forests, shrublands and human-modified habitat underneath rocks or logs. In 2004, it was successfully introduced to the Ōtamahua / Quail Island reserve in Lyttelton Harbour. It is nocturnal and most active during the breeding season in spring and summer. Genetic studies indicate that there is a split between western and eastern populations of the species, perhaps due to geographical separation.