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Taxonomy
Family: Subfamily:
CASSIDAE: PHALIINAE
Full Classification:
Mollusca (Phylum)
> Gastropoda (Class)
> Caenogastropoda (Subclass)
> Littorinimorpha (Order)
> Tonnoidea (Superfamily)
> Cassidae (Family)
> Phaliinae (Subfamily)
> Semicassis (Genus)
> thomsoni (Species)
Genus Synonyms:
=Cassis (Semicassis) Mörch, 1852
=Phalium (Semicassis) Mörch, 1852
=Phalium (Xenogalea) Iredale, 1927
=Semicassis (Xenophalium) Iredale, 1927
=Xenogalea Iredale, 1927
=Xenophalium Iredale, 1927
Synonymised Names:
=Cassis (Casmaria) thomsoni Brazier, 1876
=Cassis thomsoni Brazier, 1876
=Semicassis (Semicassis) thomsoni (Brazier, 1876) accepted, alternate representation
=Xenogalea thomsoni (Brazier, 1876)
=Xenogalea thomsoni palinodia Iredale, 1931
Images: Semicassis thomsoni (Brazier, 1876)
From the east coast, Far North, NZ. 61mm
Dredged off Northland, NZ. 62mm
Taxonomy
Family: Subfamily:
CASSIDAE: PHALIINAE
Full Classification:
Mollusca (Phylum)
> Gastropoda (Class)
> Caenogastropoda (Subclass)
> Littorinimorpha (Order)
> Tonnoidea (Superfamily)
> Cassidae (Family)
> Phaliinae (Subfamily)
> Semicassis (Genus)
> thomsoni (Species)
Genus Synonyms:
=Cassis (Semicassis) Mörch, 1852
=Phalium (Semicassis) Mörch, 1852
=Phalium (Xenogalea) Iredale, 1927
=Semicassis (Xenophalium) Iredale, 1927
=Xenogalea Iredale, 1927
=Xenophalium Iredale, 1927
Synonymised Names:
=Cassis (Casmaria) thomsoni Brazier, 1876
=Cassis thomsoni Brazier, 1876
=Semicassis (Semicassis) thomsoni (Brazier, 1876) accepted, alternate representation
=Xenogalea thomsoni (Brazier, 1876)
=Xenogalea thomsoni palinodia Iredale, 1931
Details: Semicassis thomsoni (Brazier, 1876)
Size/Grows to:
Height 80mm, Width 55mm
Distribution:
Off east coast Northland to Bay of Plenty, New Zealand. Also Australia
Geographical Range:
A
Notes:
Marine, Distinguished by the deeply indented margin of the columellar shield
Distribution Map
 
References and Publications
  • Raven, J.L. Nov/2011 Notes on New Zealand collected species, Cookia, 23 (p.17)
  • Powell, A.W.B. 1979 New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland (p.160)
  • Powell, A.W.B. 1976 On the considerable influx of warm water molluscs that have invaded northern New Zealand waters within recent years, Records of the Auckland Institute and Museum, 13 (p.160)
  • Powell, A.W.B. 1964 New Zealand Molluscan Systematics with Descriptions of New Species: Part 4, Records of the Auckland Institute and Museum, 6(1) (p.13)

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