Broad disc is greater in length than width; smooth dorsal surface except for a single row of thorns around the eyes and extending along the back and tail; first dorsal fin that originates closer to the pelvic fin base than to the caudal fin origin.

Found on sand or mud bottoms of bays, seagrass beds, estuaries, and near rocky reefs.

Eastern Pacific, endemic from San Francisco, USA to the Gulf of California, and possible Mazatlan, Mexico.