Unio aucklandicus Gray, 1843
Gray, 1843. [in] Dieffenbach, Travels in New Zealand 2: 257.
Type(s): HOLOTYPE BMNH_42-11-9-75, Auckland, N.Z.

Diplodon (Hyridella s.s.) menziezi [sic] — Simpson (1900)
Diplodon (Hyridella s.s.) menziezi [sic] var. aucklandicus — Simpson (1914)
Hyridella aucklandica — McMichael (1957), Walker et al. (2001), Fenwick & Marshall (2006), Bogan (2010)
Hyridella (s.s.) aucklandicus — McMichael & Hiscock (1958)
Hyridella (s.s.) aucklandica — Ponder (1964), Graf & Cummings (2007)
Hyridella (s.s.) aucklandica aucklandica — Haas (1969)
Hyridella menziesii — Marshall & Fenwick (2006)
Echyridella aucklandicus — Walker et al. (2014)
Echyridella aucklandica — Marshall et al. (2014), Graf & Cummings (2021)

Unio lutulentus Reeve, 1865
‘Gould’ Reeve, 1865. Conch. Icon. 16: pl. 25, sp. 122.
(misidentified reference to Unio lutulentus Gould, 1850)

Diplodon (Hyridella s.s.) lutulentus — Simpson (1900)
Cucumerunio websteri websteri — McMichael & Hiscock (1958)

Diplodon websteri Simpson, 1902
Simpson, 1902. Nautilus 16: 30.
Simpson, 1914. Descr. Cat. Naiades: 1307.
Type(s): LECTOTYPE USNM_162342 (by McMichael & Hiscock, 1958: 476), Waiuku, New Zealand.

Diplodon (Hyridella sec. Cucumaria) websteri — Simpson (1914)
Cucumerunio websteri websteri — McMichael & Hiscock (1958), Ponder (1964), Fenwick & Marshall (2006)
Hyridella (s.s.) aucklandica websteri — Haas (1969)
Cucumerunio websteri — Walker et al. (2001), Graf & Cummings (2007), Bogan (2010), IUCN (2013)
Echyridella aucklandicus — Walker et al. (2014)
Echyridella aucklandica — Marshall et al. (2014), Graf & Cummings (2021)

Hyridella aucklandicus aucklandicus Dell, 1953
‘Gray’ Dell, 1953. unknown publication: 223-224, pl. 17, figs. 5-6; pl. 19, figs. 2-3. [in part]
(reference to Unio aucklandicus Gray, 1843)

Hyridella (s.s.) aucklandicus — McMichael & Hiscock (1958)
Echyridella aucklandica — Marshall et al. (2014)

Hyridella aucklandicus aucklandicus Dell, 1953
‘Gray’ Dell, 1953. unknown publication: 223-224, pl. 17, figs. 2, 8; pl. 19, figs. 4, 8. [in part]
(reference to Unio aucklandicus Gray, 1843)

Cucumerunio websteri delli — McMichael & Hiscock (1958)
Echyridella aucklandica — Marshall et al. (2014)

Cucumerunio websteri delli McMichael & Hiscock, 1958
McMichael & Hiscock, 1958. Austral. J. Mar. Frwtr. Res. 9(3): 477, pl. 16, figs. 1-5.
(intro'd as intra-sp. of Diplodon websteri Simpson, 1902)
Type(s): HOLOTYPE AMS_61929, Omaha River, at Leigh, New Zealand [-36.283, 174.817 ± 10 km].

Cucumerunio websteri delli — McMichael & Hiscock (1958), Ponder (1964), Fenwick & Marshall (2006)
Hyridella (s.s.) aucklandica websteri — Haas (1969)
Echyridella aucklandica — Marshall et al. (2014)

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, fig. 542c. [in part]
(misidentified reference to Unio lutulentus Gould, 1850)
Type(s): PARATYPES USNM_87847, New Zealand.

Diplodon (Hyridella s.s.) lutulentus — Simpson (1900)
Hyridella (s.s.) aucklandicus — McMichael & Hiscock (1958)
Echyridella aucklandica — Marshall et al. (2014)

Diplodon (Hyridella) lutulentus Suter, 1913
Suter, 1913. Manual New Zealand Mollusca: 939. [in part]
(misidentified reference to Diplodon (Hyridella) lutulentus Suter, 1913)

Cucumerunio websteri delli — Fenwick & Marshall (2006)
Echyridella aucklandica — Marshall et al. (2014)