Conchopus is a genus of flies in the family Dolichopodidae. It is distributed in Japan, China, Taiwan, the Hawaiian Islands, and Wake Island. The species Conchopus borealis is also an introduced species in North America and South America. The genus is sometimes considered a synonym of Thambemyia, but is considered a valid genus by some authors. Taxonomy and species Takagi (1965) originally divided the genus into seven species groups. According to Masunaga et al. (2005) and Masunaga & Saigusa (2010), the genus can be divided into two clades: one containing the rectus species group (including the type species), and the other containing all other species groups, for which the authors intended to propose a new genus. The latter clade they also consider to be the sister group of Thambemyia. rectus species group (= Conchopus sensu stricto): Conchopus acrosticalis (Parent, 1937) – Hawai‘i, Maui, Lāna‘i, Moloka‘i Conchopus borealis Takagi, 1965 – Japan, North America (introduced), Peru (introduced) Conchopus ciliatus Masunaga & Saigusa, 2010 – Hawai‘i, Maui, O‘ahu, Lisianski Conchopus crassinervis Masunaga & Saigusa, 2010 – Kaua‘i Conchopus menehune Masunaga & Saigusa, 2010 – Kaua‘i, Nihoa Conchopus minutus Masunaga & Saigusa, 2010 – Hawai‘i, Maui, Lāna‘i, Moloka‘i, O‘ahu, French Frigate Shoals Conchopus pacificus Masunaga & Saigusa, 2010 – Hawai‘i, O‘ahu, Kaua‘i, Wake Conchopus pudicus Takagi, 1965 – Japan Conchopus rectus Takagi, 1965 – Japan, China Conchopus sikokianus Takagi, 1965 – Japan Conchopus taivanensis Takagi, 1967 – Japan, Taiwansinuatus species group: Conchopus corvus Takagi, 1965 Conchopus sinuatus Takagi, 1965sigmiger species group: Conchopus saigusai Takagi, 1965 Conchopus sigmiger Takagi, 1965 Conchopus uvasima Takagi, 1965convergens species group: Conchopus convergens Takagi, 1965 Conchopus poseidonius Takagi, 1965 Conchopus signatus Takagi, 1965nodulatus species group: Conchopus nodulatus Takagi, 1965 Conchopus mammuthus Takagi, 1965anomalopus species group: Conchopus anomalopus Takagi, 1965abdominalis species group: Conchopus abdominalis Takagi, 1965 Other species: Conchopus shandongensis'' (Zhu, Yang & Masunaga, 2005) References Dolichopodidae genera Hydrophorinae Diptera of Asia Insects of Hawaii Taxa named by Sadao Takagi