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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.
K=
Kermadec Islands
A=
Aupourian - Kaipara Harbour, north around North Cape, encompassing the Three Kings Islands and south to East Cape
C=
Cookian - Lower North Island and the northern part of the South Island
F=
Forsterian - Otago, Fiordland and Stewart Island
M=
Moriorian - Chatham Islands, Pitt Island
An=
Antipodean - Subantarctic Islands of New Zealand
FW =
Freshwater
L =
Land
E =
Endemic
I =
Introduced
Bivalvia (Class) > Heterodonta (Subclass) > Gaimardioidea (Superfamily) > Gaimardiidae (Family)
Gaimardiidae
 
Genus: Gaimardia (Gaimardia)map >
Length 17mm, Height 12mm
Macquarie Island. Attached to weed in rock pools [An]
Width 4mm, Height 3mm, Endemic
South Island. Otago south and Chatham Islands. In shell sand [FM]
Length 4.5mm, Height 3.3mm, Endemic
Auckland, Antipodes and Bounty Islands. Under rocks at low tide down to about 90 metres [An]
Gaimardia (Gaimardia) trapesina Lamarck, 1819 (=flemingi Powell)
Length 32mm, Height 22mm
Auckland Islands. In beach drift [An]
Genus: Gaimardia (Neogaimardia)map >
Width 3mm, Height 3mm, Endemic
North Island. Northland east coast to Mahia [AC]
Genus: Gaimardia (Progaimardia)map >
Width 2mm, Height 2mm, Endemic
Cook Strait andSouth Island, to Stewart Island. On seaweed at low tide [CF]