Unio australis Lamarck, 1819
Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 80, sp. 46.
Type(s): LECTOTYPE MNHN_MP_0302 (by McMichael & Hiscock, 1958: 442), Nouvelle Hollande.

Diplodon (Hyridella s.s.) australis — Simpson (1900), Simpson (1914)
Hyridella (s.s.) australis — Thiele (1934), McMichael & Hiscock (1958), Haas (1969), Haas (1969), B.J. Smith (1992), Graf & Cummings (2007)
Hyridunio australis — Iredale (1934), Iredale (1943)
Hyridella australis — Graf (2000), Graf & Ó Foighil (2000), Walker et al. (2001), Baker et al. (2003), Baker et al. (2004), ... Sano et al. (2020), Graf & Cummings (2021), Sonowal et al. (2021), Chen et al. (2025), Campbell & Lydeard (2026)

Unio dorsuosus Gould, 1850
Gould, 1850. Proc. Boston Soc. Nat. Hist. 3: 296.
Type(s): HOLOTYPE USNM_5925, [Nepean River, Australia].

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

Unio napeanensis Conrad, 1850
Conrad, 1850. Proc. Acad. Nat. Sci. 5: 10.
(incorrect original spelling of Unio nepeanensis Conrad, 1850)
Type(s): PARATYPE MCZ_72077, Nepean River, New South Wales.

Diplodon (Hyridella s.s.) dorsuosus — Simpson (1900), Simpson (1914)
Propehyridella nepeanensis — Iredale (1934)
Hyridella (s.s.) australis — McMichael & Hiscock (1958), Haas (1969)

Unio nepeanensis Conrad, 1850
Conrad, 1850. Proc. Acad. Nat. Sci. 5: 10 [as ‘napeanensis’].
(correct name for Unio napeanensis Conrad, 1850)
Type(s): HOLOTYPE ANSP_129955, Australia.

Hyridella (sec. Propehyridella) nepeanensis — Thiele (1934)
Propehyridella nepeanensis — Iredale (1934), Modell (1942), Iredale (1943)
Hyridella (s.s.) australis — McMichael & Hiscock (1958), Haas (1969), B.J. Smith (1992)

Unio lessoni Küster, 1855
‘Lamarck’ Lesson, 1830. Voy. Coquille 2(1): 427, pl. 15, figs. 5-5a.
Küster, 1855. Conchyl. Cab. 9(2): 135, pl. 36, fig. 4.
Type(s): HOLOTYPE USNM_85723, N Holland [Nepean River, New South Wales, Australia].

Diplodon (Hyridella s.s.) lessoni — Simpson (1900), Simpson (1914)
Hyridella lessoni — Haas (1930)
Propehyridella nepeanensis — Iredale (1934), Iredale (1943)
Hyridella (s.s.) australis — McMichael & Hiscock (1958), Haas (1969), B.J. Smith (1992)

Propehyridella nepeanensis opportuna Iredale, 1934
Iredale, 1934. Austral. Zool. 8: 74, pl. 5, fig. 12; pl. 6, fig. 12.
Iredale, 1943. Austral. Zool. 10: 190.
(intro'd as intra-sp. of Unio napeanensis Conrad, 1850)
Type(s): HOLOTYPE (ORIG. DESIG.) AMS_61983, Richmond R trib., Wilsons R, Booyong (Creek), New South Wales, Australia [-28.748, 153.448 ± 1 km].

Propehyridella nepeanensis opportuna — Iredale (1934), Iredale (1943)
Hyridella (s.s.) australis — McMichael & Hiscock (1958), Haas (1969), B.J. Smith (1992)

Propehyridella nepeanensis novata Iredale, 1943
Iredale, 1943. Austral. Natural. 11: 92.
(intro'd as intra-sp. of Unio napeanensis Conrad, 1850)
Type(s): HOLOTYPE AMS_61982, Upper Bellinger River, New South Wales, Australia [-30.45, 152.617 ± 100 km].

Hyridella (s.s.) australis — McMichael & Hiscock (1958), Haas (1969), B.J. Smith (1992)

Unio depressa Lesson, 1830
‘Lamarck’ Lesson, 1830. Voy. Coquille 2(1): 427, pl. 15, figs. 5-5a.
(misidentified reference to Unio depressa Lamarck, 1819)

Diplodon (Hyridella s.s.) australis — Simpson (1900), Simpson (1914)
Propehyridella nepeanensis — Iredale (1934)
Hyridella (s.s.) australis — McMichael & Hiscock (1958)

Unio australis Philippi, 1848
‘Lamarck’ Philippi, 1848. Abbild. Beschr. Conch. 3: 81, pl. 5, fig. 5.
(reference to Unio australis Lamarck, 1819)

Diplodon (Hyridella s.s.) australis — Simpson (1900)

Unio australis Küster, 1861
‘Lamarck’ Küster, 1861. Conchyl. Cab. 9(2): 230, pl. 77, fig. 6.
(reference to Unio australis Lamarck, 1819)

Diplodon (Hyridella s.s.) lessoni — Simpson (1900), Simpson (1914)

Propehyridella nepeanensis narracanensis Iredale, 1934
‘Cotton & Gabriel’ Iredale, 1934. Austral. Zool. 8: 74. [in part]
Iredale, 1943. Austral. Zool. 10: 190.
(misidentified reference to Propehyridella narracanensis Cotton & Gabriel, 1932)

Hyridella (s.s.) australis — McMichael & Hiscock (1958)