The Butler's frogfish or blackspot anglerfish, Tathicarpus butleri, is a rare species of frogfish in the family Antennariidae. The only member of its genus, this species is the most derived member of its family and represents a separate lineage from all other frogfishes, leading to some consideration of it being placed in its own family. It is found off the southern coast of New Guinea, and along the coasts of Western Australia to 33° S latitude, the Northern Territory, and Queensland to 22° S latitude. A benthic species, it inhabits inshore tropical waters and coral reefs to a maximum depth of 145 m (476 ft), though most are found shallower than 45 m (148 ft). Its specific epithet is after its discoverer Dr. Graham Butler.