Unio ambiguus Philippi, 1847
‘Parreyss’ Philippi, 1847. Abbild. Beschr. Conch. 3: 47, pl. 3, fig. 2.
(renamed Unio philippianus Küster, 1861)
Type(s): HOLOTYPE BMNH_41-4-29-103, Australia.

Diplodon (Hyridella s.s.) australis — Simpson (1900), Simpson (1914)
Westralunio ambiguus — Iredale (1934), Iredale (1943)
Velesunio ambiguus — McMichael (1957), McMichael & Hiscock (1958), Cotton (1961), Haas (1969), B.J. Smith (1992), ... Sano et al. (2020), Klunzinger et al. (2021), Graf & Cummings (2021), Sonowal et al. (2021), Klunzinger et al. (2022)
Hyridella (Velesunio) ambigua — Haas (1969)
Velesunio ambigua — Graf (2000), Graf (2002)
Velesunio ambiguous [sic] — Graf & Cummings (2006), Pfeiffer & Graf (2015)

Unio balonnensis Conrad, 1850
Conrad, 1850. Proc. Acad. Nat. Sci. 5: 10.
Type(s): HOLOTYPE ANSP_189249, Balonne River, Australia.

Diplodon (Hyridella s.s.) australis — Simpson (1900), Simpson (1914)
Velesunio balonnensis — Iredale (1934), Modell (1942), Iredale (1943)
Velesunio ambiguus — McMichael & Hiscock (1958), Cotton (1961), Haas (1969), B.J. Smith (1992), Graf & Cummings (2007), Graf & Cummings (2021)
Hyridella (Velesunio) ambigua — Haas (1969)

Unio balonensis Lea, 1852
‘Conrad’ of Authors.
Lea, 1852. Synopsis Fam. Naiades: 33.
Reeve, 1864. Conch. Icon. 16: pl. 18, sp. 81.
(error for Unio balonnensis Conrad, 1850)

Unio vittatus Lea, 1859
Lea, 1859. Proc. Acad. Nat. Sci. 11: 153.
Lea, 1860. Jour. Acad. Nat. Sci. 4 [O. 7]: 249, pl. 38, fig. 128.
Type(s): HOLOTYPE BMNH_1958-4-3-1, Australia.

Diplodon (Hyridella s.s.) vittatus — Simpson (1900), Simpson (1914)
Velesunio shuttleworthi — Iredale (1934), Iredale (1943)
Velesunio ambiguus — McMichael & Hiscock (1958), Cotton (1961), Haas (1969), B.J. Smith (1992)

Unio philippianus Küster, 1861
Küster, 1861. Conchyl. Cab. 9(2): 235, pl. 79, fig. 2.
(new name for Unio ambiguus Philippi, 1847)

Diplodon (Hyridella s.s.) australis — Simpson (1900), Simpson (1914)
Westralunio ambiguus — Iredale (1934), Iredale (1943)
Velesunio ambiguus — McMichael & Hiscock (1958), Cotton (1961), Haas (1969), B.J. Smith (1992), Klunzinger et al. (2022)

Unio (Alasmodon) evansi Adams & Angas, 1864
Adams & Angas, 1864. Proc. Zool. Soc. London 1864: 39.
Type(s): HOLOTYPE BMNH_40-10-26-42, Lagoons of Lower Murray River, South Australia.

Diplodon (Hyridella s.s.) evansi — Simpson (1900), Simpson (1914)
Velesunio evansi — Iredale (1934), Iredale (1943)
Velesunio ambiguus — McMichael & Hiscock (1958), Cotton (1961), Haas (1969), B.J. Smith (1992)

Unio danellii Villa, 1871
Villa, 1871. J. de Conch. 19: 328.
Type(s): SYNTYPE MNHN_MP_0038, Australia meridionale.

Diplodon (Hyridella s.s.) australis — Simpson (1900), Simpson (1914)
Velesunio danellii — Iredale (1934), Iredale (1943)
Velesunio ambiguus — McMichael & Hiscock (1958), Haas (1969), B.J. Smith (1992)

Unio jeffreysianus Lea, 1871
Lea, 1871. Proc. Acad. Nat. Sci. 23: 188.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 23, pl. 7, fig. 20.
Type(s): FIGURED SYNTYPE USNM_84849, Australia.

Diplodon (Hyridella s.s.) jeffreysianus — Simpson (1900), Simpson (1914)
Velesunio danellii — Iredale (1934), Iredale (1943)
Velesunio ambiguus — McMichael & Hiscock (1958), Cotton (1961), Haas (1969), B.J. Smith (1992)

Hyridella australis E.A. Smith, 1882
‘Lamarck’ of Authors.
E.A. Smith, 1882. J. Linn. Soc., Zool. 16: 309.
Ortmann, 1912. Nautilus 25(9): 100.
Simpson, 1914. Descr. Cat. Naiades: 1297.
Cotton & Gabriel, 1932. Proc. Roy. Soc. Victoria 44(2): 155, pl. 16, fig. 1.
(misidentified reference to Unio australis Lamarck, 1819)

Velesunio ambiguus — McMichael & Hiscock (1958), Cotton (1961)

Unio daniellii Simpson, 1900
‘Villa’ of Authors.
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 891.
Simpson, 1914. Descr. Cat. Naiades: 1298.
(error for Unio danellii Villa, 1871)

Unio protovittatus Hale & Tindale, 1930
Hale & Tindale, 1930. Rec. South Austral. Mus. 4: 154, fig. 9.

Velesunio ambiguus — McMichael & Hiscock (1958), Cotton (1961), Haas (1969), B.J. Smith (1992)

Velesunio balonnensis adjunctus Iredale, 1934
Iredale, 1934. Austral. Zool. 8: 59, 76, pl. 3, fig. 3; pl. 4, fig. 3.
Iredale, 1943. Austral. Natural. 11: 88.
Iredale, 1943. Austral. Zool. 10: 189.
(intro'd as intra-sp. of Unio balonnensis Conrad, 1850)
Type(s): HOLOTYPE (ORIG. DESIG.) AMS_12003, Richmond River, New South Wales, Australia [-28.867, 153.05 ± 100 km].

Velesunio balonnensis adjunctus — Iredale (1934), Iredale (1943)
Velesunio ambiguus — McMichael & Hiscock (1958), Cotton (1961), Haas (1969), B.J. Smith (1992)

Velesunio balonnensis intricatus Iredale, 1934
Iredale, 1934. Austral. Zool. 8: 60, 76, pl. 3, fig. 2; pl. 4, fig. 2.
Iredale, 1943. Austral. Zool. 10: 189.
(intro'd as intra-sp. of Unio balonnensis Conrad, 1850)
Type(s): HOLOTYPE (ORIG. DESIG.) AMS_61725, Rockhampton, Queensland, Australia [-23.367, 150.533 ± 10 km].

Velesunio balonnensis intricatus — Iredale (1934), Iredale (1943)
Velesunio ambiguus — McMichael & Hiscock (1958), Haas (1969), B.J. Smith (1992)

Velesunio mckeowni Iredale, 1943
Iredale, 1943. Austral. Natural. 11: 88, fig. 1.
Type(s): HOLOTYPE AMS_61721, Murrumbidgee River at Leeton, New South Wales, Australia [-34.617, 146.383 ± 10 km].

Velesunio ambiguus — McMichael & Hiscock (1958), Cotton (1961), Haas (1969), B.J. Smith (1992)

Velesunio testatus Iredale, 1943
Iredale, 1943. Austral. Natural. 11: 88.
Type(s): HOLOTYPE AMS_61699, Murray River at Benthagi (Backwater), New South Wales, Australia.

Velesunio ambiguus — McMichael & Hiscock (1958), Cotton (1961), Haas (1969), B.J. Smith (1992)

Velesunio transitus Iredale, 1943
Iredale, 1943. Austral. Natural. 11: 89.
Type(s): LECTOTYPE AMS_61691 (by McMichael & Hiscock, 1958: 392), Nepean River nr Camden, New South Wales, Australia [-34.067, 150.7 ± 10 km].

Velesunio ambiguus — McMichael & Hiscock (1958), Cotton (1961), Haas (1969), B.J. Smith (1992)

Unio fairfieldi of Authors, unknown year
in coll. UMMZ of Authors.

Unio ambiguus E.A. Smith, 1882
‘Parreyss’ E.A. Smith, 1882. J. Linn. Soc., Zool. 16: 309. [in part]
(reference to Unio ambiguus Philippi, 1847)

Velesunio balonnensis — Iredale (1934)
Velesunio ambiguus — McMichael & Hiscock (1958)

Velesunio ambiguous Graf & Cummings, 2006
‘Philippi’ Graf & Cummings, 2006. Zool. J. Linn. Soc. 148: 348, table 2.
‘Philippi’ Pfeiffer & Graf, 2015. Zool. J. Linn. Soc. 175(2): [4].
(error for Unio ambiguus Philippi, 1847)