Unique Characters: Scaleless body with four dorsal spines angled alternately left to right. Long slender caudal peduncle. No bony plates on sides. Pelvic fins below pectoral fins.
Similar Species: Threespine Stickleback Gasterosteus aculeatus. Although not yet recorded from North Carolina, it has been documented in Chesapeake Bay. It has three dorsal spines and a short caudal peduncle. Bony plates on sides. Pelvic fins behind pectoral fins.