In synonymy:
Allepeira Banks, 1932 = Mecynogea Simon, 1903 (Levi, 1968a: 322)
Hentzia McCook, 1894 = Mecynogea Simon, 1903 (Levi, 1968a: 322, together with its replacement name Allepeira)
Transferred to other genera:
Mecynogea carvalhoi Mello-Leitão, 1944 -- see Argiope
Mecynogea guianensis Mello-Leitão, 1948 -- see Manogea
Mecynogea guyanensis (Keyserling, 1881) -- see Manogea
In synonymy:
Mecynogea affinitata (Kraus, 1955) = Mecynogea lemniscata Walckenaer, 1841 (Levi, 1980a: 14)
Mecynogea basilica (McCook, 1878) = Mecynogea lemniscata Walckenaer, 1841 (Archer, 1940: 24, sub Allepeira conferta)
Mecynogea bimucronata (Mello-Leitão, 1936, T from Gea) = Mecynogea erythromela Holmberg, 1876 (Levi, 1997: 224)
Mecynogea bituberculata (Mello-Leitão, 1939, T from Mangora) = Mecynogea erythromela Holmberg, 1876 (Levi, 1997: 225)
Mecynogea chavona Levi, 1997 = Mecynogea infelix Soares & Camargo, 1948 (Martins & Santos, 2018: 425)
Mecynogea conferta (Hentz, 1850) = Mecynogea lemniscata Walckenaer, 1841 (Chamberlin & Ivie, 1944: 93, sub Allepeira)
Mecynogea trivittata (O. Pickard-Cambridge, 1889) = Mecynogea lemniscata Walckenaer, 1841 (Levi, 1997: 228)
Mecynogea tucumana Simon, 1903 = Mecynogea erythromela Holmberg, 1876 (Levi, 1997: 224)
Mecynogea wiedenmeyeri (Schenkel, 1953, T from Gea) = Mecynogea lemniscata Walckenaer, 1841 (Levi, 1997: 228)