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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
Gastropoda - Opisthobranchia - Cephalaspidea - Family: Retusidae

Retusidae

 

Genus: Relichna

 
Relichna aupouria Powell, 1937
Height 5.5mm, Width 2.5mm
Off Three Kings Islands, 475 metres [AE.]
 
Relichna pachys (Watson, 1883)
Height 5.8mm, Width 3.5mm
Off North and South Island. Off Chatham Rise and Chatham Islands. Trawled 300-1200 metres [ACFME.]
 
Relichna simplex (Murdoch & Suter, 1906)
Height 4.4mm, Width 2.2mm
Northland to Bay of Plenty, W Cook Strait, Fiordland, Chatham Rise and Chatham Islands [ACFME.]
 

Genus: Retusa

 
Retusa opima (Finlay, 1926)
Height 3.3mm, Width 1.8mm
Northland to Stewart Island [ACFE.]
 
Retusa oruaensis (Webster, 1908)
Height 4mm, Width 2mm
North, South and Chatham Islands. In shell sand [ACFME.]
 
Retusa striata (Hutton, 1873)
Height 3mm, Width 2.5mm
South Island, Stewart and Chatham Islands. Snares, Antipodes, Auckland and Campbell Islands [CFMAnE.]