NZ Mollusca

Mactra (Maorimactra) ordinaria (E.A.Smith, 1898)

Mactra ordinaria
In beach drift, Tokerau Beach, Northland, NZ, 14mm
Classification: Mollusca - Bivalvia - Heterodonta - Mactridae: Mactrinae - Mactra (Maorimactra)
Family: MACTRIDAE: MACTRINAE
Size/Grows to: Length 15mm, Height 10mm
Distribution: North Island and northern half of South Island. In mud in shallow water [A.C.]
Notes: Endemic. Sculpture of very fine and dense concentric lirations, slightly stronger at the sides. Distinguished from juvenile discors by the lack of a posterior ridge
Some known Localities
  • Pandora Bank, Far North, NZ
  • NW of Ahipara, 90 metres, Far North, NZ
  • NW of Ahipara, Far North, NZ
  • Tokerau Beach, N end Doubtless Bay, Northland, NZ
  • Tauranga Bay, Whangaroa, Northland, NZ
  • Owhanga Bay, Whangaroa Harbour, Northland, NZ
  • N of Black & Moturoa Islands, 31 metres, Bay of Islands, Northland, NZ
  • Off Onewhero Bay, 15 metres, Bay of Islands, Northland, NZ
  • Off Onewhero Bay, 18 metres, Bay of Islands, Northland, NZ
  • Off Motukauri Island, Whangaruru Harbour, Northland, NZ *2
  • 700m SSE of Motukauri Island, Whangaruru Harbour, Northland, NZ *2
  • E end of Ngawai Bay, Helena Bay, N of Whangarei, Northland, NZ
  • Off Tiritiri Matangi Island, Hauraki Gulf, NZ
  • Takapuna Beach, Auckland, NZ
  • Manukau Harbour, Auckland, NZ
  • Te Puru, N of Thames, Coromandel, NZ
  • Whakatiwai, Firth of Thames, NZ
  • Maioro Beach, SW of Waiuku, Auckland, NZ
  • Off Plate Island (Motunau), 82 metres, Bay of Plenty, NZ
  • Off Moutohora (Whale) Island, Bay of Plenty, NZ
  • Between Moutohora (Whale) Island & mainland, Bay of Plenty, NZ
  • Off Otarawairere Bay, Ohope, Bay of Plenty, NZ
  • N of New Plymouth, 48 metres, Taranaki, NZ *2
  • Off Hapuka Rock, Seal Rocks, Sugar Loaf Islands, New Plymouth, Taranaki, NZ *2
  • New Plymouth, main basin, Taranaki, NZ
  • Hawkes Bay, NZ
  • Off Napier, Hawkes Bay, NZ
  • Off Napier, 29 metres, Hawkes Bay, NZ
  • Off Napier, Hawkes Bay, NZ
  • Off Cape Kidnappers, Hawkes Bay, NZ
  • S of Patea, 40 metres, Taranaki, NZ *2
  • Wharariki Beach, Cape Farewell, Tasman, NZ
  • Off W side of D'Urville Island, 62 metres, Marlborough Sounds, NZ *2
  • Te Horo Beach, Wellington, NZ
  • Off Rocks Point, S of Kahurangi Point, Northern Westland, NZ
  • Waikanae River estuary, Wellington, NZ
  • Between Kahurangi Point and Heaphy River, 55 metres, Northern Westland, NZ *2
  • Rabbit Island, Nelson, NZ
  • Tahunanui Beach, Nelson, NZ
  • Head of Pegasus Canyon, 366-311 metres, Canterbury, NZ *2
  • Off Hanata Island, NE of Haast, Westland, NZ
  • Lyttelton Harbour, 7 metres, Canterbury, NZ, (holotype)
  • Off Onawe Point, head of Akaroa Harbour, Banks Peninsula, Canterbury, NZ
  • Akaroa Harbour, Christchurch, Canterbury, NZ
  • E of Pompeys Pillar, Banks Peninsula, Canterbury, NZ *2
  • Hapuka River mouth, SW of Haast, Westland, NZ
  • Akaroa Harbour entrance, 13-15 metres, Canterbury, NZ
  • N side of Smoothwater Bay, SW of Haast, Westland, NZ
  • Flowerpot Rock, Jackson Bay, Westland, NZ
  • Milford Sound, 81 metres, Fiordland, NZ
  • Sandy Beach, S of Oamaru, Otago, NZ
  • Off Otago Peninsula, NZ
  • Off Taiaroa Head, 110 metres, Otago, NZ
more localities
References:
  • Powell, A.W.B. 1979: New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland (p.414)

Note: Localities are approximate, and represent only some of the known localities for the species.

*2 © Museum of New Zealand Te Papa Tongarewa CC BY-NC-ND