|Family||Scientific Name||Author||Year||Common Name|
|Petromyzontidae||Lethenteron appendix||(DeKay)||1842||American Brook Lamprey|
Unique Characters: Nonparasitic. Dorsal fin deeply notched appearing as two contiguous dorsal fins. Oral disc narrower than head and with blunt teeth. No black on lateral pores. Known to only occur in Spring Creek and nearby French Broad River in Hot Springs, Madison County.
Ohio Lamprey Ichthyomyzon bdellium. Parasitic. One slightly notched dorsal fin. Oral disc as wide or wider than head. Sharp, well-developed teeth in radiating rows with lateral teeth bicuspid. Lateral line neuromasts on the ventral surface of the branchial region darkly pigmented. Black on lateral line pores. Thick, functional gut in adults.
Mountain Brook Lamprey
Mountain Brook Lamprey Ichthyomyzon greeleyi. Nonparasitic. One slightly notched dorsal fin. Oral disc narrower than head. Moderately developed disc teeth; posterior and outer teeth bluntly rounded. Lateral line neuromasts on the ventral surface of the branchial region unpigmented. No black on pores below gills. Thin, non-functional gut in adults.