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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 =
Bivalvia - Heterodonta - Lucinida - Family: Thyasiridae

Thyasiridae: Thyasirinae


Genus: Genaxinus

Genaxinus cookianus Fleming, 1950
Width 1mm, Height 1.1mm, Endemic
North, South and Chatham Islands. From about 50 metres to over 500 metres [ACFME.]
Genaxinus otagoensis (Suter, 1913)
Width 4.5mm, Height 4.5mm, Endemic
South Island, Chathams, Auckland, Campbell Island. Off Otago Heads to Fiordland, 25 to over 100 metres [FE.]

Genus: Maorithyas

Maorithyas flemingi Powell, 1955
Width 5.5mm, Height 6.5mm, Endemic
Off Auckland and Campbell Islands [AnE.]
Maorithyas marama Fleming, 1950
Width 18mm, Height 17mm, Endemic
Lower North Island, South and Stewart Island. Waikanae Beach, Wellington south [CFE.]

Genus: Parathyasira

Width 9mm, Height 9mm, Endemic
Off North Cape to Otago, trawled 60 to over 600 metres [ACFE.]

Genus: Prothyasira

Prothyasira peregrina (Iredale, 1930)
Width 8.5mm, Height 10mm, Endemic
North, South, Stewart and Chatham Islands. From 3 to around 600 metres [ACFME.]
Prothyasira waikanae (Fleming, 1950)
Width 7.5mm, Height 7.8mm, Endemic
Waikanae Beach, Wellington [CE.]