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Taxonomy
Family: Subfamily:
MACTRIDAE: MACTRINAE
Full Classification:
Mollusca (Phylum)
> Bivalvia (Class)
> Autobranchia (Subclass)
> Heteroconchia (Infraclass)
> Euhetrodonta (Subterclass)
> Imparidentia (Superorder)
> Venerida (Order)
> Mactroidea (Superfamily)
> Mactridae (Family)
> Mactrinae (Subfamily)
> Cyclomactra (Genus)
> tristis (Species)
Genus Synonyms:
=Mactra (Cyclomactra) Dall, 1895
Synonymised Names:
=Mactra rudis Hutton, 1873
=Mactra tristis Reeve, 1854 (original combination)
Images: Cyclomactra tristis (Reeve, 1854)
Kawhia Harbour, Waikato, NZ. 47mm
Kawhia Harbour, Waikato, NZ. 47mm
Taxonomy
Family: Subfamily:
MACTRIDAE: MACTRINAE
Full Classification:
Mollusca (Phylum)
> Bivalvia (Class)
> Autobranchia (Subclass)
> Heteroconchia (Infraclass)
> Euhetrodonta (Subterclass)
> Imparidentia (Superorder)
> Venerida (Order)
> Mactroidea (Superfamily)
> Mactridae (Family)
> Mactrinae (Subfamily)
> Cyclomactra (Genus)
> tristis (Species)
Genus Synonyms:
=Mactra (Cyclomactra) Dall, 1895
Synonymised Names:
=Mactra rudis Hutton, 1873
=Mactra tristis Reeve, 1854 (original combination)
Details: Cyclomactra tristis (Reeve, 1854)
Size/Grows to:
Width 60mm, Height 55mm
Distribution:
North Island as far north as Auckland, northern South Island as far south as Christchurch, and Chatham Islands. Intertidal
Geographical Range:
ACFM
Notes:
Marine, Native - Endemic, Buried in mud at low tide
Distribution Map
 
References and Publications
  • Hazelwood, B.F. Dec/1990 Further records of Mactra (Cyclomactra) tristis (Reeve, 1854), Poirieria, 16(2) (p.45)
  • Douglas, W.N. Nov/1980 Items of Interest. Mactra (Cyclomactra) ovata tristis Reeve., Poirieria, 10(6) (p.102)
  • Powell, A.W.B. 1979 New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland (p.413)
  • Douglas, W.N. Aug/1976 Cyclomactra tristis, Poirieria, 8(4)

Key to Geographical Ranges
NZ Map showing 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.
K=
Kermadec Islands
A=
Aupourian - Kaipara Harbour, north around North Cape, encompassing the Three Kings Islands and south to East Cape
C=
Cookian - Lower North Island and the northern part of the South Island
F=
Forsterian - Otago, Fiordland and Stewart Island
M=
Moriorian - Chatham Islands, Pitt Island
An=
Antipodean - Subantarctic Islands of New Zealand
Fw =
Freshwater
L =
Land
N =
North Island
S =
South Island
R =
Recent
Sf =
Subfossil
Fo =
Fossil
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