Genus Medionidus C. T. Simpson, 1900

(3-6-4-0-4-9-5-44-0-0-0-0-0)
Ref. Amer. Fish. Soc., 1988 p 31
Vokes, 1980 p 89

acutissimus (I. Lea, 1831)
(3-6-4-0-4-9-5-44-0-1-0-0-0)
Alabama Moccasinshell
Ref. Amer. Fish. Soc., 1988 p 31

conradicus (I. Lea, 1834)
(3-6-4-0-4-9-5-44-0-2-0-0-0)
Cumberland Moccasinshell
Ref. Amer. Fish. Soc., 1988 p 31

macglameriae H. Van der Schalie, 1939
(3-6-4-0-4-9-5-44-0-3-0-0-0)
Tombigbee Moccasinshell
Ref. Amer. Fish. Soc., 1988 p 31

parvulus (I. Lea, 1860)
(3-6-4-0-4-9-5-44-0-4-0-0-0)
Coosa Moccasinshell
Ref. Amer. Fish. Soc., 1988 p 31

penicillatus (I. Lea, 1857)
(3-6-4-0-4-9-5-44-0-5-0-0-0)
Gulf Moccasinshell
Ref. Amer. Fish. Soc., 1988 p 31

simpsonianus B. Walker, 1905
(3-6-4-0-4-9-5-44-0-6-0-0-0)
Ochlocknee Moccasinshell
Ref. Amer. Fish. Soc., 1988 p 31

walkeri (S. H. Wright, 1897)
(3-6-4-0-4-9-5-44-0-7-0-0-0)
Suwannee Moccasinshell
Ref. Amer. Fish. Soc., 1988 p 31