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Taxonomy
Family:
LASAEIDAE
Full Classification:
Mollusca (Phylum)
> Bivalvia (Class)
> Autobranchia (Subclass)
> Heteroconchia (Infraclass)
> Euhetrodonta (Subterclass)
> Imparidentia (Superorder)
> Galeommatida (Order)
> Galeommatoidea (Superfamily)
> Lasaeidae (Family)
> Arthritica (Genus)
> crassiformis (Species)
Images: Arthritica crassiformis Powell, 1933
Holotype, collected Mahina Bay, Wellington, NZ (M.001892). 3.5mm. © Museum of New Zealand Te Papa Tongarewa (CC-BY-NC-ND)
Holotype, collected Mahina Bay, Wellington, NZ (M.001892). 3.5mm. © Museum of New Zealand Te Papa Tongarewa (CC-BY-NC-ND)
Holotype, collected Mahina Bay, Wellington, NZ (M.001892). 3.5mm. © Museum of New Zealand Te Papa Tongarewa (CC-BY-NC-ND)
Taxonomy
Family:
LASAEIDAE
Full Classification:
Mollusca (Phylum)
> Bivalvia (Class)
> Autobranchia (Subclass)
> Heteroconchia (Infraclass)
> Euhetrodonta (Subterclass)
> Imparidentia (Superorder)
> Galeommatida (Order)
> Galeommatoidea (Superfamily)
> Lasaeidae (Family)
> Arthritica (Genus)
> crassiformis (Species)
Details: Arthritica crassiformis Powell, 1933
Size/Grows to:
Width 5.5mm, Height 4.5mm
Distribution:
North Island and northern part of South Island
Geographical Range:
AC
Notes:
Marine, Native - Endemic, Commensal upon the pholad, rock boring Anchomasa, usually found around the base of the siphon and along the lower mantle edges
Distribution Map
 
References and Publications
  • Powell, A.W.B. 1979 New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland (p.391)
  • Gardner, N.W. Jun/1974 The genus Arthritica Finlay, 1927 - Small Commensal Bivalves, Poirieria, 7(4) (p.78)
  • Powell, A.W.B. 1933 On five new species of recent New Zealand Mollusca, Proceedings of the Malacological Society of London, 20(5) (p.195) Original Description

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