| Family | Scientific Name | Author | Year | Common Name |
| Petromyzontidae | Ichthyomyzon greeleyi | Hubbs & Trautman | 1937 | Mountain Brook Lamprey |
Ichthyomyzon greeleyi
Unique Characters: 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.
Similar Species:
Ohio Lamprey
Ichthyomyzon bdellium
American Brook Lamprey
Lethenteron appendix
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. The ammocoetes of these two species cannot be differentiated, except in the Hiwassee basin where Ohio Lamprey is not known to occur. Thick, functional gut in adults.
American Brook Lamprey Lethenteron appendix. 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.
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