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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 - Caenogastropoda - Heterobranchia - Family: Rissoellidae

Rissoellidae

 

Genus: Rissoella

 
Height 1.4mm, Width 0.8mm, Common on low tidal seaweed
North, South, Stewart and Chatham Islands [ACFMAnE.]
 
Rissoella flemingi Ponder, 1968
Height 1.7mm, Width 1.1mm
Cook Strait south to Stewart Island, Chatham and Southern Islands [CFMAnE.]
 

Genus: Rissoella (Jeffreysiella)

 
Height 2.4mm, Width 1.4mm
North and South Island east coast. Fiordland and Stewart Island [ACFAnE.]
 
Kermadec Islands [K.]
 

Genus: Rissoella (Zelaxitas)

 
Height 1.1mm, Width 0.8mm
East coast of North, South, Stewart and Chatham Islands, mostly on large brown algae [ACFME.]
 
Height 0.6mm, Width 0.7mm
North and South Island. Fiordland, Stewart, Campbell and Chatham Islands [ACFMAnE.]