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Taxonomy
Family:
RETUSIDAE
Full Classification:
Mollusca (Phylum)
> Gastropoda (Class)
> Heterobranchia (Subclass)
> Euthyneura (Infraclass)
> Tectipleura (Subterclass)
> Cephalaspidea (Order)
> Bulloidea (Superfamily)
> Retusidae (Family)
> Retusa (Genus)
> opima (Species)
Genus Synonyms:
=Clistaxis Cossmann, 1895
=Coleophysis P. Fischer, 1883
=Cryptaxis Jeffreys, 1883
=Cylichnina Monterosato, 1884
=Mamilloretusa F. Nordsieck, 1972
=Retusa (Coleophysis) P. Fischer, 1883
=Retusa (Cylichnina) Monterosato, 1884
=Retusa (Retusa) T. Brown, 1827
=Retusa (Sulcularia) Dall, 1921
=Sulcoretusa J.Q. Burch, 1945
=Tornatina (Coleophysis) P. Fischer, 1883
=Tornatina (Utriculus) T. Brown, 1844
=Utriculus T. Brown, 1844
Synonymised Names:
=Cylichnina opima Finlay, 1926
Images: Retusa opima (Finlay, 1926)
Holotype, collected at Lyall Bay, Wellington, NZ (MA70233). © Auckland Museum (CC-BY)
Collected at Lyall Bay, Wellington, NZ (MA73681). © Auckland Museum (CC-BY)
Taxonomy
Family:
RETUSIDAE
Full Classification:
Mollusca (Phylum)
> Gastropoda (Class)
> Heterobranchia (Subclass)
> Euthyneura (Infraclass)
> Tectipleura (Subterclass)
> Cephalaspidea (Order)
> Bulloidea (Superfamily)
> Retusidae (Family)
> Retusa (Genus)
> opima (Species)
Genus Synonyms:
=Clistaxis Cossmann, 1895
=Coleophysis P. Fischer, 1883
=Cryptaxis Jeffreys, 1883
=Cylichnina Monterosato, 1884
=Mamilloretusa F. Nordsieck, 1972
=Retusa (Coleophysis) P. Fischer, 1883
=Retusa (Cylichnina) Monterosato, 1884
=Retusa (Retusa) T. Brown, 1827
=Retusa (Sulcularia) Dall, 1921
=Sulcoretusa J.Q. Burch, 1945
=Tornatina (Coleophysis) P. Fischer, 1883
=Tornatina (Utriculus) T. Brown, 1844
=Utriculus T. Brown, 1844
Synonymised Names:
=Cylichnina opima Finlay, 1926
Details: Retusa opima (Finlay, 1926)
Size/Grows to:
Height 3.3mm, Width 1.8mm
Distribution:
Northland to Stewart Island
Geographical Range:
ACFE.
Notes:
Marine, Endemic
Distribution Map
 
References and Publications
  • Powell, A.W.B. 1979 New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland (p.277)
  • Finlay, H. 1926 A Further Commentary on New Zealand Molluscan Systematics, Transactions and Proceedings of the Royal Society of New Zealand, 57 (p.439) Original Description

*98 © Museum of New Zealand Te Papa Tongarewa (CC-BY-NC-ND)

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
E =
Endemic
I =
Introduced
R =
Recent
Sf =
Subfossil
Fo =
Fossil
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