Large Trough Shell, Marine, Endemic, Darker, more inflated than Mactra murchisoni. Colour white under a dark brown periostracum
References and Publications
Conroy, A.M., Smith, P.J., Michael, K.P., Stotter, D.R. 1993 Identification and recruitment patterns of juvenile surf clams, Mactra discors and M. murchisoni from central New Zealand, New Zealand Journal of Marine and Freshwater Research, 27(3) (p.279)
Powell, A.W.B. 1979New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland (p.413)
Boswell, J. Mar/1972 Notes of Interest: Mactra discors, Poirieria, 6(3) (p.58)
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