Nerodia rhombifer Squamata suborder Serpentes Nerodia rhombifer Diamondback Water Snake Search for another Amphibian or Reptile. Search for amphibians and reptiles by Illinois county. Go to the INHS Amphibian and Reptile Collection page. Search the INHS collections data for this species by clicking on the button below. Search the Type Specimen Data for this species by clicking on the button below.
Yellow shade indicates verified sighting.
Slanted hatch indicates pre-1980 records only. Not all specimens upon which these maps are based have been verified. Mississippi green water snake, cottonmouth. Diamondback water snake, N . Pattern brightest in juveniles, obscured in some large adults.