New burrowing crayfish of the genus fallicambarus hobbs, 1969 (Decapoda: Cambaridae) from the Red River Drainage of the southcentral United States

A new primary burrowing crayfish, Fallicambarus schusteri, is described from the Red River drainage of extreme south-eastern Oklahoma and southwestern Arkansas and is placed in the subgenus Fallicambarus. The species occurs in road-side ditches that seasonally flood and have silt and silt-loam dominated soils. Falllicambarus schusteri differs from all other members of the genus Fallicambarus in possessing a thin gradually tapering central projection and a wide triangular cephalic process on the first pleopod of form I males, a sufflamen on the cheliped, and an antennal scale that is widest at its midpoint.