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Taxonomy
Family:
RISSOIDAE
Full Classification:
Mollusca (Phylum)
> Gastropoda (Class)
> Caenogastropoda (Subclass)
> Littorinimorpha (Order)
> Rissooidea (Superfamily)
> Rissoidae (Family)
> Alvania (Genus)
> gradatoides (Species)
Genus Synonyms:
=Alvania (Linemera) Finlay, 1924 accepted, alternate representation
Synonymised Names:
=Alvania (Linemera) gradatoides (Finlay, 1930) accepted, alternate representation
=Alvinia (Linemera) gradatoides (Finlay, 1930)
=Linemera gradatoides Finlay, 1930
Images: Alvania gradatoides (Finlay, 1930)
Holotype, collected in 90 metres, off Oamaru, Northern Otago, NZ (MA70402). © Auckland Museum (CC-BY)
Taxonomy
Family:
RISSOIDAE
Full Classification:
Mollusca (Phylum)
> Gastropoda (Class)
> Caenogastropoda (Subclass)
> Littorinimorpha (Order)
> Rissooidea (Superfamily)
> Rissoidae (Family)
> Alvania (Genus)
> gradatoides (Species)
Genus Synonyms:
=Alvania (Linemera) Finlay, 1924 accepted, alternate representation
Synonymised Names:
=Alvania (Linemera) gradatoides (Finlay, 1930) accepted, alternate representation
=Alvinia (Linemera) gradatoides (Finlay, 1930)
=Linemera gradatoides Finlay, 1930
Details: Alvania gradatoides (Finlay, 1930)
Size/Grows to:
Height 3.0mm, Width 1.6mm
Distribution:
South-eastern South Island
Notes:
Marine, Native - Endemic
Distribution Map
 
References and Publications
  • Ponder, W.F. 1985 A review of the genera of the Rissoidae (Mollusca: Mesogastropoda: Rissoacea), Records of the Australian Museum (p.45)
  • Powell, A.W.B. 1979 New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland (p.97)
  • Finlay, H. 1930 Additions to the Recent fauna of New Zealand. No. 3, Transactions of the New Zealand Institute, 61 (p.226) Original Description

NZ Geographical Regions
Key to symbols used in Checklist.
Fw =
Freshwater
L =
Land
N =
North Island
S =
South Island
R =
Recent
Sf =
Subfossil
Fo =
Fossil
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