Quick Search
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 - Anomalodesmata - Pholadomyoida - Family: Thraciidae



Genus: Asthenothaerus

Asthenothaerus maxwelli Marshall, 2002
Length 46mm, Endemic
North, South, Stewart, Auckland, Antipodes, Bounty and Chatham Islands and Chatham Rise, 0-293 metres [ACFMAnE.]

Genus: Barythaerus

Barythaerus biconvexus (Powell, 1927)
Width 2.9mm, Height 2mm, Endemic
Off Soutb West Otago from 180 metres [FE.]
Barythaerus cuneatus (Powell, 1937)
Width 5.5mm, Height 3.7mm, Endemic
Off Three Kings Islands, trawled in 170 metres [AE.]

Genus: Parvithracia

Parvithracia ampla Marshall, 2002
Width 3mm, Height 2.5mm, Endemic
Off Three Kings Islands, North, South Islands and Chatham Rise. Trawled around 35-1000 metres [ACFME.]
Parvithracia suteri (Finlay, 1927)
Width 5mm, Height 4.8mm, Endemic
Off Three Kings Islands, North and South Island. Trawled in around 140-475 metres [ACFE.]

Genus: Parvithracia (Pseudasthenothaerus)

Length 7.9mm, Endemic
Off north-western and south-eastern South Island, 421-1386 metres [CFE.]
Length 11.5mm
Off Three Kings Islands, 88-805 metres. Also off Norfolk Island [A]

Genus: Thracia

Thracia vegrandis Marshall & Murdoch, 1919
Width 25mm, Height 17mm, Endemic
North, South, Chatham, Auckland and Cambell Islands. Dredged from around 10 to over 50 metres [ACFMAnE.]

Genus: Thracia (Crassithracia)

CurcumAntarctic, Southern NZ [F]

Genus: Thracia (Odontocineta)

Width 25mm, Height 17mm, Endemic
North, South and Stewart Island. Dredged around 15-140 metres [ACFE.]

Genus: Trigonothracia

Trigonothracia mimica Marshall, 2002
Width 4mm, Height 4mm
North Island, South Island, Fiordland, and Chatham Islands [ACFM]