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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.
Kermadec Islands
Aupourian - Kaipara Harbour, north around North Cape, encompassing the Three Kings Islands and south to East Cape
Cookian - Lower North Island and the northern part of the South Island
Forsterian - Otago, Fiordland and Stewart Island
Moriorian - Chatham Islands, Pitt Island
Antipodean - Subantarctic Islands of New Zealand
FW =
L =
E =
I =
Gastropoda - Opisthobranchia - Cephalaspidea - Family: Cylichnidae



Genus: Cylichna

Cylichna bulloida Dell, 1956
Height 4.3mm, Width 2.5mm, Endemic
Lower North Island and Chatham Rise to Chatham Islands, 280-600 metres [CME.]
Cylichna thetidis Hedley, 1903
Height 11mm, Width 4mm, Shell narrow, elongate-cylindrical, white under a pale yellow periostracum. Columella thickened, with a single strong fold
Northland to Bay of Plenty and occasional occurences as far south as Wellington. Also New South Wales, Australia [K.A]
Cylichna zealandica T.W.Kirk, 1880
Height 9mm, Width 3.8mm, Endemic. Closely resembling thetidis, but has a sudden narrowing of the shell at the apex, and the columellar fold is very slight to obsolete
North Island down to Cook Strait. In shell sand and dredged to at least 60 metres [ACE.]

Genus: Toledonia

Height 2mm, Width 1.5mm, Endemic
Southern Islands. Off Auckland Islands, 175 metres [FAnE.]