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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: Sportellidae

Sportellidae

 

Genus: Anisodonta (Austrosportella)

 
Width 7.3mm, Height 4.7mm
South Island. Off Taiaroa Heads, Otago. Off Chatham Islands [FME.]
 

Genus: Anisodonta (Tahunanuia)

 
Width 10mm, Height 5.5mm
North and South Islands [ACFME.]
 
Width 4.8mm, Height 3.5mm, Shorter and more trigonal than alata and has the umbonal-ventral ridge stronger and distinctly angulate
Off Campbell Island [AnE.]
 

Genus: Isoconcha

 
Isoconcha integra (Hedley, 1907)
Width 6mm, Height 3.5mm, Commensal, attached to the external surface of the holothurian Mesothuria lactea
Southern North Island, South Island and Chatham Rise. Also South Australia to New South Wales [CFM]