Mecyclothorax is a genus of beetles that contains over 400 described species or subspecies, mostly from the Hawaiian Islands and Tahiti and Moorea, French Polynesia. Additional radiations have evolved in Queensland, Australia, New Guinea and New Caledonia. The genus has been divided into five subgenera: Eucyclothorax Liebherr 2018 of Australia, Qecyclothorax Liebherr 2018 of Queensland, Australia, Meonochilus Liebherr & Marris, 2009 of New Zealand, Phacothorax Jeannel 1944 of New Caledonia, and the more widely distributed subgenus Mecyclothorax Sharp 1903 [in Australia, the Sundas, New Zealand, the Society Islands, and Hawaii]. The adelphotaxon to Mecyclothorax is hypothesized to consist of the genera associated with Amblytelus Blackburn, also distributed in Australia, and therefore the evolutionary history of Mecyclothorax commenced in Australia.
Mecyclothorax kaukukini is a species of ground beetle in the subfamily Psydrinae. It was described by Liebherr in 2008.
Mecyclothorax maunakukini is a species of ground beetle in the subfamily Psydrinae. It was described by Liebherr in 2008.
Mecyclothorax obscurus is a species of ground beetle in the subfamily Psydrinae. It was described by Liebherr in 2006.
Mecyclothorax trisetifer is a species of ground beetle in the subfamily Psydrinae. It was described by Liebherr in 2006.
Mecyclothorax giffardi is a species of ground beetle in the subfamily Psydrinae. It was described by Liebherr in 2005.
Mecyclothoraxaeneus is a species of ground beetle in the subfamily Psydrinae. It was described by Sharp in 1903.
Mecyclothorax argutor is a species of ground beetle in the subfamily Psydrinae. It was described by Sharp in 1903.
Mecyclothorax bradycellinus is a species of ground beetle in the subfamily Psydrinae. It was described by Sharp in 1903.
Mecyclothorax ferruginosus is a species of ground beetle in the subfamily Psydrinae. It was described by Perrault in 1988.
Mecyclothorax ata is a species of ground beetle in the subfamily Psydrinae. It was described by Perrault in 1978.
Mecyclothorax cupreus is a species of ground beetle in the subfamily Psydrinae. It was described by Perrault in 1978.
Mecyclothorax tantalus is a species of ground beetle in the subfamily Psydrinae. It was described by Britton in 1948.
Mecyclothorax riedeli is a species of ground beetle in the subfamily Psydrinae. It was described by Baehr in 1992.
Mecyclothorax constrictus is a species of ground beetle in the subfamily Psydrinae. It was described by Sharp in 1903.
Mecyclothorax ducalis is a species of ground beetle in the subfamily Psydrinae. It was described by Sharp in 1903.
Mecyclothorax globicollis is a species of ground beetle in the subfamily Psydrinae. It was described by Mandl in 1969.
Mecyclothorax carteri is a species of ground beetle in the subfamily Psydrinae. It was described by Perkins in 1917.
Mecyclothorax lophoides is a species of ground beetle in the subfamily Psydrinae. It was described by Chaudoir in 1854.
