Lutraria bruuni Powell, 1967
Marine, Native - Endemic
Off Kermadec Islands, from 15-83m

Crassula aequilatera (Deshayes, 1854)
Width 75mm, Height 55mm
Diamond Surf Clam, Triangle Shell, Marine, Native - Endemic
North, South and Stewart Island. In shallow water off sandy beaches, from 0-5m

Cyclomactra ovata (Gray, 1843)
Width 80mm, Height 62mm
Marine, Native - Endemic
Northern and south-western North Island; northern, eastern and southern South Island, and Stewart, Auckland and Chatham Islands. Buried deeply in soft mud, from 0-20m

Cyclomactra tristis (Reeve, 1854)
Width 60mm, Height 55mm
Marine, Native - Endemic, Buried in mud at low tide
North Island as far north as Auckland, northern South Island as far south as Christchurch, and Chatham Islands. Intertidal, from 0m

Mactra ordinaria E.A. Smith, 1898
Width 19mm, Height 12mm
Marine, Native - Endemic
North Island and South Island as far south as Dunedin. In mud in shallow water, from 0-311m

Oxyperas bellianum (W.R.B. Oliver, 1915)
Marine, Native - Endemic
Kermadec Islands, from 0-84m

Oxyperas elongatum (Quoy & Gaimard, 1835)
Length 111mm, Width 65mm
Long Trough Shell, Marine, Native - Endemic
King Bank and Three Kings Islands, north-eastern and south-western North Island, far northern and eastern South Island, Stewart and Chatham Islands, and Mernoo Bank, from 0-293m

Scalpomactra scalpellum (Reeve, 1854)
Length 34mm, Height 20mm
Marine, Native - Endemic
Three Kings, North, South, Stewart and Chatham Islands, and Mernoo Bank, from 0-550m

Spisula discors Gray, 1873
Width 90mm, Height 80mm, Thickness 45mm
Large Trough Shell, Marine, Native - Endemic
North-eastern and southern North Island, northern and southern South Island, from 0-7m

Spisula murchisoni Deshayes, 1854
Width 98mm, Height 80mm
Marine, Native - Endemic
North Island and northern and southern South Island. On exposed sandy beaches, from 0-8m

Resania lanceolata Gray, 1852
Length 120mm, Height 57mm
Lance Mactra, Marine, Native - Endemic
North and South Islands, as far south as Warrington. Off sandy ocean beaches in shallow water, from 0-6m

Zenatia acinaces (Quoy & Gaimard, 1835)
Length 117mm, Height 54mm
Scimitar Mactra, Marine, Native - Endemic
North, South and Stewart Islands. Off sandy beaches, from 0-182m