Unio depressa Lamarck, 1819
Lamarck, 1819, Hist. Natur. Anim. sans Vert. 6: 79, sp. 38.
Type(s): SYNTYPES MNHN_4088, Nouvelle Hollande.

Unio depressa — Lamarck (1819), Lea (1829), Lea (1834), d’Orbigny (1846), Tate (1887)
Unio (s.s.) depressa — d’Orbigny (1835)
Margarita (Unio) depressus — Lea (1836), Lea (1838)
Unio depressus — Hanley (1843), Reeve (1864), E.A. Smith (1882)
Margaron (Unio) depressus — Lea (1852), Lea (1870)
Unio (Niäa) depressus — Adams & Adams (1857)
Diplodon (Hyridella s.s.) cultelliformis — Simpson (1900), Simpson (1914)
Rugoshyria depressa — Iredale (1934), Iredale (1943)
Hyridella depressa — McMichael (1957), Graf (2000), Graf & Ó Foighil (2000), Graf & Ó Foighil (2000), ..., Araujo et al. (2017), Huang et al. (2019), Lopes-Lima et al. (2020), Graf & Cummings (2021)
Hyridella (s.s.) depressa — McMichael & Hiscock (1958), Haas (1969), B.J. Smith (1992), Graf & Cummings (2007)
Hyridella (Echyridella) depressa — Santos-Neto et al. (2016)

Unio cultelliformis Conrad, 1850
Conrad, 1850, Proc. Acad. Nat. Sci. 5: 10.
Conrad, 1854, Jour. Acad. Nat. Sci. 2(4): 296, pl. 26, fig. 6 [Unio sp.].
Type(s): HOLOTYPE ANSP_41808, Bogan River, Australia.

Unio cultelliformis — Conrad (1850)
Margaron (Unio) cultelliformis — Lea (1852), Lea (1870)
Unio (Niäa) cultelliformis — Adams & Adams (1857)
Unio depressus — E.A. Smith (1882)
Diplodon (Hyridella s.s.) cultelliformis — Simpson (1900), Simpson (1914)
Rugoshyria cultelliformis — Iredale (1934), Iredale (1943)
Hyridella (s.s.) depressa — McMichael & Hiscock (1958), Haas (1969), B.J. Smith (1992)

Unio mutabilis Lea, 1859
Lea, 1859, Proc. Acad. Nat. Sci. 11: 152.
Lea, 1860, Jour. Acad. Nat. Sci. 4 [O. 7]: 248 [66], pl. 38, fig. 127.
Type(s): LECTOTYPE BMNH_1965153, Brisbane Water, East Australia.

Unio mutabilis — Lea (1859), Reeve (1865)
Margaron (Unio) mutabilis — Lea (1870)
Unio depressus — E.A. Smith (1882)
Unio depressa — Tate (1887)
Diplodon (Hyridella sec. Cucumaria) mutabilis — Simpson (1900), Simpson (1914)
Rugoshyria depressa — Iredale (1934), Iredale (1943)
Hyridella (s.s.) depressa — McMichael & Hiscock (1958), Haas (1969), B.J. Smith (1992)

Unio paramattensis Lea, 1862
Lea, 1862, Proc. Acad. Nat. Sci. 14: 176.
Lea, 1866, Jour. Acad. Nat. Sci. 6 [O. 11]: 60 [64], pl. 20, fig. 59.
Type(s): FIGURED SYNTYPE USNM_84405, Paramatta R., N.S.W.

Unio paramattensis — Lea (1862), Lea (1866)
Margaron (Unio) paramattensis — Lea (1870)
Diplodon (Hyridella s.s.) cultelliformis — Simpson (1900), Simpson (1914)
Rugoshyria depressa — Iredale (1934), Iredale (1943)
Hyridella (s.s.) depressa — McMichael & Hiscock (1958), Haas (1969), B.J. Smith (1992)

Unio mutabilis Reeve, 1865
‘Lea’ Reeve, 1865, Conch. Icon. 16: pl. 24, sp. 112.
(reference to Unio mutabilis Lea, 1859)

Unio mutabilis — Reeve (1865)
Diplodon (Hyridella sec. Cucumaria) shuttleworthii — Simpson (1900), Simpson (1914)
Hyridella (s.s.) depressa — McMichael & Hiscock (1958)

Unio paramettensis de Gregorio, 1914
‘Lea’ de Gregorio, 1914, Il Nat. Siciliano 2: 36.
(error for Unio paramattensis Lea, 1862)

Unio paramettensis — de Gregorio (1914)

Rugoshyria depressa monticola Iredale, 1934
Iredale, 1934, Austral. Zool. 8: 72, pl. 5, fig. 7a-b; pl. 6, fig. 10.
Iredale, 1943, Austral. Zool. 10: 190.
(intro'd as intra-sp. of Unio depressa Lamarck, 1819)
Type(s): HOLOTYPE (ORIG. DESIG.) AMS_61952, Kosciusko, Grosse's Plain Creek, Moonbar Run (Moonbah), New South Wales, Australia [-36.519, 148.513 ± 1 km].

Rugoshyria depressa monticola — Iredale (1934), Iredale (1943)
Hyridella (s.s.) depressa — McMichael & Hiscock (1958), Haas (1969), B.J. Smith (1992)

Rugoshyria depressa vicinalis Iredale, 1934
Iredale, 1934, Austral. Zool. 8: 72.
Iredale, 1943, Austral. Zool. 10: 190.
(intro'd as intra-sp. of Unio depressa Lamarck, 1819)
Type(s): LECTOTYPE AMS_57939, Mitchell River at Bairnsdale, Gippsland, Victoria, Australia [-37.833, 147.617 ± 10 km].

Rugoshyria depressa vicinalis — Iredale (1934), Iredale (1943)
Hyridella (s.s.) depressa — McMichael & Hiscock (1958), Haas (1969), B.J. Smith (1992)

Rugoshyria depressa bega Iredale, 1943
Iredale, 1943, Austral. Natural. 11: 91.
(intro'd as intra-sp. of Unio depressa Lamarck, 1819)
Type(s): HOLOTYPE AMS_43362, Tantawanglo River, tributary of Bega River, New South Wales, Australia [-36.742, 149.647 ± 10 km].

Rugoshyria depressa bega — Iredale (1943)
Hyridella (s.s.) depressa — McMichael & Hiscock (1958), Haas (1969), B.J. Smith (1992)

Rugoshyria depressa lowanna Iredale, 1943
Iredale, 1943, Austral. Natural. 11: 91; Abb. 1.
(intro'd as intra-sp. of Unio depressa Lamarck, 1819)
Type(s): HOLOTYPE AMS_61950, Little Nymboida River at Lowanna, near Dorrigo, New South Wales, Australia [-30.215, 152.901 ± 1 km].

Rugoshyria depressa lowanna — Iredale (1943)
Hyridella (s.s.) depressa — McMichael & Hiscock (1958), Haas (1969), B.J. Smith (1992)

Taxonomic History (since 1900)

Diplodon (Hyridella s.s.) cultelliformis — Simpson (1900), Simpson (1914)
Diplodon (Hyridella sec. Cucumaria) mutabilis — Simpson (1900), Simpson (1914)
Diplodon (Hyridella sec. Cucumaria) shuttleworthii — Simpson (1900), Simpson (1914)
Unio paramettensis — de Gregorio (1914)
Rugoshyria depressa — Iredale (1934), Iredale (1943)
Rugoshyria cultelliformis — Iredale (1934), Iredale (1943)
Rugoshyria depressa monticola — Iredale (1934), Iredale (1943)
Rugoshyria depressa vicinalis — Iredale (1934), Iredale (1943)
Rugoshyria depressa bega — Iredale (1943)
Rugoshyria depressa lowanna — Iredale (1943)
Hyridella depressa — McMichael (1957), Graf (2000), Graf & Ó Foighil (2000), Graf & Ó Foighil (2000), ..., Araujo et al. (2017), Huang et al. (2019), Lopes-Lima et al. (2020), Graf & Cummings (2021)
Hyridella (s.s.) depressa — McMichael & Hiscock (1958), Haas (1969), B.J. Smith (1992), Graf & Cummings (2007)
Hyridella (Echyridella) depressa — Santos-Neto et al. (2016)