Unio menziesii Gray, 1843
Gray, 1843. [in] Dieffenbach, Travels in New Zealand 2: 257.
Type(s): HOLOTYPE BMNH_42-5-17-170, New Zealand.

Diplodon (Hyridella s.s.) menziezi [sic] — Simpson (1900), Simpson (1914)
Hyridella (Echyridella) menziesi — McMichael & Hiscock (1958), Ponder (1964), Haas (1969)
Hyridella menziesi — Graf & Ó Foighil (2000), Bogan & Hoeh (2000), Walker et al. (2001), Hoeh et al. (2001), Hoeh et al. (2002), Hoeh et al. (2002), Baker et al. (2003), Roe & Hoeh (2003), Baker et al. (2004), Graf & Cummings (2006), Walker et al. (2006), Hoeh et al. (2009)
Echyridella menziesii — Fenwick & Marshall (2006), Graf & Cummings (2007), Bogan (2010), IUCN (2013), Walker et al. (2014), ... Graf & Cummings (2021), Wu et al. (2021), Wu et al. (2022), Wu et al. (2024), Dai et al. (2025)
Hyridella menziesii — Marshall & Fenwick (2006), Breton et al. (2011), Mitchell et al. (2016), Guerra et al. (2017), Huang et al. (2018)
Hyridella (Echyridella) menziesii — Santos-Neto et al. (2016), Wu et al. (2023)

Unio waikarensis Colenso, 1845
Colenso, 1845. Tasmanian J. Nat. Sci. 2: 257.

Diplodon (Hyridella s.s.) waikarensis — Simpson (1900), Simpson (1914)
Hyridella (Echyridella) menziesi — McMichael & Hiscock (1958), Haas (1969)
Echyridella menziesii — Fenwick & Marshall (2006), Marshall et al. (2014)
Hyridella menziesii — Marshall & Fenwick (2006)

Unio lutulentus Gould, 1850
Gould, 1850. Proc. Boston Soc. Nat. Hist. 3: 295. [in part]
Gould, 1852. U.S. Explor. Exped. 12: 428. [in part]
Gould, 1856. U.S. Explor. Exped. 12: pl. 37, 542a-b. [in part]
Type(s): LECTOTYPE USNM_5927 (by McMichael & Hiscock, 1958: 462), N. Zealand.

Diplodon (Hyridella s.s.) lutulentus — Simpson (1900), Simpson (1914)
Hyridella (Echyridella) menziesi — McMichael & Hiscock (1958), Haas (1969)
Echyridella menziesii — Fenwick & Marshall (2006), Marshall et al. (2014)
Hyridella menziesii — Marshall & Fenwick (2006)

Unio hochstetteri Dunker, 1862
Dunker, 1862. Malak. Blatt. 8: 153.
Type(s): TYPE ZMB_108724, Waikato Fluss, New Zealand.

Diplodon (Hyridella s.s.) menziezi [sic] var. hochstetteri — Simpson (1900), Simpson (1914)
Hyridella (Echyridella) menziesi — McMichael & Hiscock (1958), Haas (1969)
Echyridella menziesii — Fenwick & Marshall (2006), Marshall et al. (2014)
Hyridella menziesii — Marshall & Fenwick (2006)

Unio depauperata Hutton, 1882
Hutton, 1882. New Zealand J. Sci. Techn. 1: 478.
Type(s): LECTOTYPE DMW_M.644, Lake Takapuna, near Aukland, New Zealand.

Diplodon (Hyridella s.s.) menziezi [sic] var. depauperatus — Simpson (1900), Simpson (1914)
Hyridella (Echyridella) menziesi — McMichael & Hiscock (1958), Haas (1969)
Echyridella menziesii — Fenwick & Marshall (2006), Marshall et al. (2014)
Hyridella menziesii — Marshall & Fenwick (2006)

Unio rugatus Hutton, 1882
Hutton, 1882. New Zealand J. Sci. Techn. 1: 478.
(homonym of Unio rugatus Menke, 1828; renamed Diplodon (Hyridella s.s.) menziesi rugulosus Simpson, 1914)

Diplodon (Hyridella s.s.) menziezi [sic] var. rugatus — Simpson (1900)
Diplodon (Hyridella s.s.) menziezi [sic] var. rugulosus — Simpson (1914)
Hyridella (Echyridella) menziesi — McMichael & Hiscock (1958), Haas (1969)
Echyridella menziesii — Fenwick & Marshall (2006), Marshall et al. (2014)
Hyridella menziesii — Marshall & Fenwick (2006)

Diplodon lessoni Suter, 1905
‘Kuster’ Suter, 1905. Trans. Proc. New Zealand Inst. 37: 240, text fig. 4.
Suter, 1913. Manual New Zealand Mollusca: 938, pl. 59, figs. 1-1a.
(misidentified reference to Unio lessoni Küster, 1855)

Hyridella (Echyridella) menziesi — McMichael & Hiscock (1958)

Diplodon (Hyridella) menziesi lucasi Suter, 1905
Suter, 1905. Trans. Proc. New Zealand Inst. 37: 239, text figs. 1-2.
(intro'd as intra-sp. of Unio menziesii Gray, 1843)
Type(s): LECTOTYPE NMNZ_M.126976, Lake Manapouri, South Island, New Zealand.

Diplodon (Hyridella s.s.) menziezi [sic] var. lucasi — Simpson (1914)
Hyridella (Echyridella) menziesi — McMichael & Hiscock (1958), Haas (1969)
Echyridella lucasi — Fenwick & Marshall (2006), Graf & Cummings (2007), Bogan (2010), IUCN (2013)
Hyridella menziesii — Marshall & Fenwick (2006)
Echyridella menziesii — Walker et al. (2014), Marshall et al. (2014), Graf & Cummings (2021)

Diplodon (Hyridella) menziesi acuta Suter, 1907
Suter, 1907. Proc. Malac. Soc. London 7: 239, pl. 22, figs. 11-12.
Suter, 1913. Manual New Zealand Mollusca: 940, pl. 11, figs. 11-11a.
(intro'd as intra-sp. of Unio menziesii Gray, 1843)
Type(s): PARATYPE AMS_25498, Lake Omapere, North I., New Zealand [-35.333, 173.8 > ± 100 km].

Diplodon (Hyridella s.s.) menziezi [sic] var. acuta — Simpson (1914)
Hyridella (Echyridella) menziesi — McMichael & Hiscock (1958), Haas (1969)
Echyridella menziesii — Fenwick & Marshall (2006)
Hyridella menziesii — Marshall & Fenwick (2006)

Diplodon (Hyridella s.s.) menziesi rugulosus Simpson, 1914
Simpson, 1914. Descr. Cat. Naiades: 1291.
(intro'd as intra-sp. of Unio menziesii Gray, 1843; new name for Unio rugatus Hutton, 1882)

Diplodon (Hyridella s.s.) menziezi [sic] var. rugulosus — Simpson (1914)
Hyridella (Echyridella) menziesi — McMichael & Hiscock (1958), Haas (1969)

Unio zelebori Hutton, 1880
‘Dunker’ of Authors.
Hutton, 1880. Manual New Zealand Mollusca: 161.
McMichael & Hiscock, 1958. Austral. J. Mar. Frwtr. Res. 9(3): 460, pl. 14, figs. 10-11.
(misidentified reference to Unio zelebori Dunker, 1866)

Echyridella menziesii — Marshall et al. (2014)

Unio aucklandicus Reeve, 1865
‘Gray’ Reeve, 1865. Conch. Icon. 16: pl. 30, sp. 156.
(misidentified reference to Unio aucklandicus Gray, 1843)

Diplodon (Hyridella s.s.) menziezi [sic] — Simpson (1900)
Hyridella (Echyridella) menziesi — McMichael & Hiscock (1958)
Echyridella menziesii — Marshall et al. (2014)

Unio menziesianus Reeve, 1865
‘Gray’ Reeve, 1865. Conch. Icon. 16: pl. 29, sp. 152.
(error for Unio menziesii Gray, 1843)

Diplodon (Hyridella s.s.) menziezi [sic] — Simpson (1900), Simpson (1914)
Hyridella (Echyridella) menziesi — McMichael & Hiscock (1958)
Echyridella menziesii — Marshall et al. (2014)

Unio lutulentus Sowerby, 1868
‘Gould’ Sowerby, 1868. Conch. Icon. 16: pl. 74, sp. 386.
(reference to Unio lutulentus Gould, 1850)

Hyridella (Echyridella) menziesi — McMichael & Hiscock (1958)

Margaron (Unio) menzieni Lea, 1870
‘Gray’ Lea, 1870. Synopsis Fam. Naiades: 46.
(error for Unio menziesii Gray, 1843)

Diplodon (Hyridella s.s.) menziezi [sic] — Simpson (1900), Simpson (1914)

Diplodon (Hyridella s.s.) menziezi Simpson, 1900
‘Gray’ Simpson, 1900. Proc. U.S. Nat. Mus. 22: 889.
‘Gray’ Simpson, 1914. Descr. Cat. Naiades: 1290.
(error for Unio menziesii Gray, 1843)

Echyridella menziesii — Marshall et al. (2014)

Unio menziezianus Simpson, 1900
‘Reeve’ Simpson, 1900. Proc. U.S. Nat. Mus. 22: 889.
(error for Unio menziesianus Reeve, 1865)