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

Unio australis — Lamarck (1819), Deshayes (1832), Lea (1834), Hanley (1843), Philippi (1848), Küster (1861), E.A. Smith (1882)
Margarita (Unio) australis — Lea (1836), Lea (1838)
Hyridella australis — Swainson (1840), Graf (2000), Graf & Ó Foighil (2000), Walker et al. (2001), ..., Wu et al. (2020), Sano et al. (2020), Graf & Cummings (2021), Sonowal et al. (2021)
Margaron (Unio) australis — Lea (1852), Lea (1870)
Unio (Hyridella) australis — Mörch (1853), Adams & Adams (1857)
Unio (Limnium sec. Hyridella) australis — Fischer (1887)
Unio (sec. Hyridella) australis — Paetel (1890)
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)

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

Unio depressa — Lesson (1830)
Unio (s.s.) obtusa — d’Orbigny (1835)
Margarita (Unio) auratus — Lea (1838)
Unio depressus — Hanley (1843)
Unio obtusa — d’Orbigny (1846)
Margaron (Unio) auratus — Lea (1852)
Unio lessoni — Küster (1855)
Unio auratus — Reeve (1865)
Margaron (Unio) depressus — Lea (1870)
Unio nepeanensis — E.A. Smith (1882)
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)

Unio australis — Philippi (1848)
Margaron (Unio) australis — Lea (1852), Lea (1870)
Diplodon (Hyridella s.s.) australis — Simpson (1900)

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

Unio dorsuosus — Gould (1850)
Margaron (Unio) dorsuosus — Lea (1852)
Unio (Diplodon) dorsuosus — Adams & Adams (1857)
Margaron (Unio) napeanensis — Lea (1870)
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.

Unio napeanensis — Conrad (1850), Reeve (1865)
Margaron (Unio) napeanensis — Lea (1852), Lea (1870)
Unio (Dysnomia) napeanensis — Adams & Adams (1857)
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.

Unio nepeanensis — Conrad (1850), E.A. Smith (1882)
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].

Unio lessoni — Küster (1855)
Unio nepeanensis — E.A. Smith (1882)
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)

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

Unio australis — Küster (1861)
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)

Propehyridella nepeanensis narracanensis — Iredale (1934)
Hyridella (s.s.) australis — McMichael & Hiscock (1958)

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].

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

Taxonomic History (since 1900)

Diplodon (Hyridella s.s.) australis — Simpson (1900), Simpson (1914)
Diplodon (Hyridella s.s.) dorsuosus — Simpson (1900), Simpson (1914)
Diplodon (Hyridella s.s.) lessoni — Simpson (1900), Simpson (1914)
Hyridella lessoni — Haas (1930)
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)
Propehyridella nepeanensis — Iredale (1934), Modell (1942), Iredale (1943)
Hyridella (sec. Propehyridella) nepeanensis — Thiele (1934)
Propehyridella nepeanensis narracanensis — Iredale (1934)
Propehyridella nepeanensis opportuna — Iredale (1934), Iredale (1943)
Propehyridella nepeanensis novata — Iredale (1943)
Hyridella australis — Graf (2000), Graf & Ó Foighil (2000), Walker et al. (2001), Baker et al. (2003), ..., Wu et al. (2020), Sano et al. (2020), Graf & Cummings (2021), Sonowal et al. (2021)