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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
R =
Recent
Sf =
Subfossil
Fo =
Fossil
Mollusca (Phylum) > Bivalvia (Class) > Pteriomorphia (Subclass) > Arcida (Order) > Limopsoidea (Superfamily) > Philobryidae (Family) > Cosa (Genus)
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Genus: Cosamap >
Cosa costata (Bernard, 1896)
Width 2.5mm, Height 3.2mm, Marine, Endemic
Throughout southern NZ and islands. Shallow water to about 180 metres CFMAnE.
Cosa dispar Powell, 1937
Marine, Endemic
Off Three Kings Islands, trawled AE.
Cosa filholi (Bernard, 1897)
Width 2.5mm, Height 3.2mm, Marine, Endemic
Cook Strait, South, Stewart and Chatham Islands CFMAnE.
Cosa laevicostata Powell, 1933
Width 1.8mm, Height 2.3mm, Marine, Endemic
Far North, in shell sand AE.
Cosa serratocostata Powell, 1933
Width 2.3mm, Height 2.8mm, Marine, Endemic
Off Three Kings Islands, 475 metres. Far North and Northland, in shell sand AE.