Powell, A.W.B. 1979New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland (p.357)
Adams, A. 1856 Descriptions of thirty four new species of bivalve Mollusca (Leda, Nucula, and Pythina) from the Cumingian collection, Proceedings of the Zoological Society of London, 24 (p.52) Original Description
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 approximation of the range of each species within New Zealand.
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