A new syntopic species of Stygobromus Cope, 1872 (Amphipoda: Crangonyctidae) from groundwaters in Georgia and Florida, USA, with notes on S. floridanus Holsinger & Sawicki, 2016

Stygobromus doughertyensis n. sp. is described from groundwater habitats in Jackson County, Florida and Dougherty County, Georgia, USA using both morphological and molecular methods. This species occurs syntopically with the morphologically similar S. floridanus, which is newly recorded in Jackson County. The occurrence of S. floridanus in Jackson County marks a range extension for this species, which was described from two caves in Washington County, Florida. The description of S. doughertyensis n. sp. brings the number of described species in the genus Stygobromus to 142 and marks the second species of Stygobromus to be described from the Floridan aquifer.