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Key to Geographical Ranges
The symbols K.A.C.F.M.An. are used to indicate the geographical range of the species. They have been adopted to give an approxomation of the range of each species within New Zealand.
Kermadec Islands
Aupourian - Kaipara Harbour, north around North Cape, encompassing the Three Kings Islands and south to East Cape
Cookian - Lower North Island and the northern part of the South Island
Forsterian - Otago, Fiordland and Stewart Island
Moriorian - Chatham Islands, Pitt Island
Antipodean - Subantarctic Islands of New Zealand
FW =
L =
E =
I =
Bivalvia - Heterodonta - Veneroida - Family: Cyamiidae



Genus: Cyamiomactra

Width 4.5mm, Height 3mm, Endemic
Southern South Island and Subantarctic Islands [FMAnE.]

Genus: Kidderia

Kidderia acrobeles (Suter, 1913)
Width 4mm, Height 3mm, Endemic
Off Stewart, Snares and Antipodes Islands [FAnE.]
Kidderia aupouria Powell, 1933
Length 2.7mm, Height 1.7mm, Endemic
North Island. Far North, in shell sand [AE.]
Kidderia bicolor (Martens, 1885)
Length 5mm, Height 3.7mm, Endemic
Macquarie Islands. Also South Georgia, Kerguelen and Heard Islands. Intertidal under stones and among seaweed [AnE.]
Kidderia campbellica Odhner, 1924
Length 7mm, Height 4.5mm, Endemic
Campbell and Antipodes Islands [AnE.]
Kidderia fiordlandica Fleming, 1948
Width 2.3mm, Height 1.5mm, Endemic
South Island. Fiordland, Stewart Island and Chatham Islands [FME.]
Kidderia marshalli Fleming, 1948
Length 4.5mm, Height 2.7mm, Endemic
South Island, Fiordland and Auckland Islands [FAnE.]
Kidderia oblonga (E.A.Smith, 1899)
Length 8mm, Height 4mm
Macquarie Island [An]
Kidderia rakiura Powell, 1939
Length 8.5mm, Height 5mm, Endemic
Stewart and Chatham Islands [FME.]
Kidderia subquadrata (Pelseneer, 1903)
Width 3.5mm, Height 2mm
Macquarie Island. Attached to algae in rock pools [An]

Genus: Kidderia (Costokidderia)

Width 7mm, Height 4mm, Endemic
Off Auckland Islands, Campbell and Antipodes Islands [AnE.]
Length 3.8mm, Height 2.8mm
Throughout NZ and Chatham Islands [ACFM]

Genus: Legrandina

Width 2mm, Height 1.7mm, Endemic
Auckland and Campbell Islands [AnE.]
Legrandina harrisonae Powell, 1935
Width 1.7mm, Height 1.5mm, Endemic
Stewart Island [FE.]
Legrandina turneri Powell, 1939
Width 2.8mm, Height 2.4mm, Endemic
Southern South Island, Stewart and Chatham Islands, 0-20 fathoms [FME.]

Genus: Perrierina

Perrierina georgiana Fleming, 1948
Length 1.4mm, Height 1.3mm, Endemic
South Island. Fiordland [FE.]
Perrierina insulana Powell, 1933
Length 1.9mm, Height 1.6mm, Endemic
Stewart, Snares and Chatham Islands [FMAnE.]
Perrierina matai Fleming, 1948
Length 1.5mm, Height 1.3mm, Endemic
South Island. Fiordland [FE.]
Perrierina mestayerae Powell, 1933
Length 2mm, Height 1.5mm, Endemic
Off Otago and Snares Islands [FAnE.]
Perrierina perstriata Fleming, 1948
Width 2.6mm, Height 2.1mm, Endemic
South Island. Fiordland [FE.]
Length 1.8mm, Height 1.4mm, Endemic
Mernoo Bank, east of Cook Strait [CE.]
Perrierina substriata Powell, 1935
Width 2.7mm, Height 2.2mm, Endemic
Off Three Kings Islands. In fish stomachs [AE.]
Perrierina taxodonta Bernard, 1897
Width 3.5mm, Height 2.5mm, Endemic
South Island. Off eastern Otago, Foveaux Strait and Stewart Island [FE.]