Lethenteron appendix

Lethenteron appendix
American Brook Lamprey – Lethenteron appendix
FamilyScientific NameAuthorYearCommon Name
PetromyzontidaeLethenteron appendix (DeKay)1842American Brook Lamprey

Lethenteron appendix

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.

Lethenteron appendix
American Brook Lamprey – Lethenteron appendix

Similar Species

Ohio Lamprey
Ichthyomzyon bdellium

Ichthyomyzon bdellium
Ohio Lamprey – Ichthyomyzon bdellium

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
Ichthyomyzon greeleyi

Ichthyomyzon greeleyi Oral Disc
Ichthyomyzon greeleyi Oral Disc

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.

Gallery