Strophurus williamsi  Strophurus williamsi, also known commonly as the eastern spiny-tailed gecko, the soft-spined gecko, and Williams' spiny-tailed gecko, is a species of lizard in the family Diplodactylidae. The species is endemic to eastern Australia. The specific name, "williamsi", is in honor of American herpetologist Ernest Edward Williams. In Australia, "S. williamsi" is found in northeastern New South Wales, Queensland, southeastern South Australia, and northwestern Victoria. The preferred habitats of "S. williamsi" are forest and savanna. "S. williamsi" is oviparous.