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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
N =
North Island
S =
South Island
E =
Endemic
I =
Introduced
Bivalvia - Heterodonta - Veneroida - Family: Mactridae

Mactridae: Mactrinae

 

Genus: Crassula

 
Crassula aequilatera (Deshayes, 1854) (=aequilateralis Deshayes)
Length 75mm, Height 55mm
North, South and Stewart Island. In shallow water off sandy beaches [ACFE.]

Genus: Cyclomactra

 
Cyclomactra ovata (Gray, 1843)
Length 80mm, Height 62mm
North, South and Chatham Islands. Buried deeply in soft mud [ACFME.]
Cyclomactra tristis (Reeve, 1854)
Length 60mm, Height 55mm
North Island. Buried in mud at low tide [ACE.]

Genus: Mactra (Maorimactra)

 
Length 13mm, Height 9.5mm, Sculpture of very fine and dense concentric lirations, slightly stronger at the sides
North Island and northern half of South Island. In mud in shallow water [ACE.]
 

Genus: Oxyperas

 
Oxyperas belliana (Oliver, 1915)
Kermadec Islands [K.E.]
 
Oxyperas elongata (Quoy & Gaimard, 1835)
Length 110mm, Width 65mm
North, South, Stewart and Chatham Islands. Shallow water to over 70 metres [ACFME.]

Genus: Scalpomactra

 
Length 30mm, Height 19mm
North, South, Stewart and Chatham Islands [ACFE.]

Genus: Spisula (Spisulona)

 
Height 80mm, Length 90mm, Thickness 45mm, Darker, more inflated than Mactra murchisoni. Colour white under a dark brown periostracum Large Trough Shell
North, South and Stewart Island [ACFE.]
Width 85mm, Height 70mm, Wider, less inflated than Mactra discors. More laterally ovate, inequilateral, has transverse plications on the lateral teeth, and the periostracum is always pale straw colour
North, South and Stewart Island. On exposed sandy beaches [ACFE.]

Mactridae: Lutrariinae

 

Genus: Lutraria (Psammophila)

 
Off Kermadec Islands [K.E.]
 

Mactridae: Zenatiinae

 

Genus: Resania

 
Resania lanceolata Gray, 1852
Length 100mm, Height 48mm, Lance Mactra
North and South Islands. Off sandy ocean beaches in shallow water [ACFE.]

Genus: Zenatia

 
Zenatia acinaces (Quoy & Gaimard, 1835)
Length 100mm, Height 46mm
North and South Islands. Off sandy beaches in shallow water to about 50 metres [ACFE.]