From Latin australis, southern, in reference to the southern distribution of the species. [details]

From Latincanaliculatus, in reference to the shell character of channelled suture. [details]

Named after the Cape Sanctuary at Cape Kidnappers. [details]

Named for its charopine-like shell architecture, sculpture, and shell colour pattern. [details]

Named after our friend and shell collector, Peter Cresswell of Motueka, who collected the type material [details]

After Fiordland, southwestern South Island. [details]

Named after Haupatoto, SW of North Cape, Northland, New Zealand [details]

Named after Mount Hikurangi, Raukumara Range, East Cape, New Zealand [details]

From Latin, in ‘not’ and perforare ‘to bore through’, referring to the shell character of closed umbilicus. [details]

After Kaipara district, north of Auckland. [details]

After Karangahake Gorge, Coromandel Peninsula, northern North Island, New Zealand [details]

The species is named after Maitai Cave, Bryant Range, Nelson. [details]

Named after Haupatoto, SW of North Cape, Northland, New Zealand [details]

Named after the farmstead near the type locality (~20 km W of Ruatoria, East Coast). [details]

Olohega is the Tokelauan name for Swains Island, the type locality for S. intermedia Solem, 1983  [details]

Named after Alan Solem for his work on Pacific snails. [details]

After Waipoua Forest and in appreciation of Te Roroa iwi members for their kaitiakitanga and manākitanga [details]

considered extinct until proven otherwise [details]

Sinployea olohega Climo, Mahlfeld & Roscoe, 2025 is a replacement name. [details]

Nom. nov. for Sinployea intermedia Solem, 1983, non Odhner, 1917 [details]