Thecadactylus is a gekko genus from the tropical Americas. They are known as the turnip-tailed geckos. The genus belongs to the gecko family Phyllodactylidae. Until 2007, it was believed to be monotypic, with T. rapicauda the sole species. Then however, the population from upstream southern Amazonia was discovered to be very distinct and was named a new species, T. solimoensis. A third species was described in 2011.