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Taxonomy
Family: Subfamily:
TROCHIDAE: MONODONTINAE
Full Classification:
Mollusca (Phylum)
> Gastropoda (Class)
> Vetigastropoda (Subclass)
> Trochida (Order)
> Trochoidea (Superfamily)
> Trochidae (Family)
> Monodontinae (Subfamily)
> Diloma (Genus)
> aridum (Species)
Genus Synonyms:
=Anisodiloma Finlay, 1926
=Cavodiloma Finlay, 1926
=Fractarmilla Finlay, 1926
=Melagraphia Gray, 1847
=Monodonta (Neodiloma) P. Fischer, 1885
=Neodiloma P. Fischer, 1885
=Trochus (Diloma) Philippi, 1845
=Zediloma Finlay, 1926
=Zediloma (Fractarmilla) Finlay, 1926
Synonymised Names:
=Zediloma arida Finlay, 1926
Images: Diloma aridum (Finlay, 1926)
On mid-tidal rocks, Kaikoura, Canterbury, NZ. 14mm
Holotype, collected Lyttelton Harbour, Canterbury, NZ (MA70869). © Auckland Museum (CC-BY)
Holotype, collected Lyttelton Harbour, Canterbury, NZ (MA70869). © Auckland Museum (CC-BY)
Taxonomy
Family: Subfamily:
TROCHIDAE: MONODONTINAE
Full Classification:
Mollusca (Phylum)
> Gastropoda (Class)
> Vetigastropoda (Subclass)
> Trochida (Order)
> Trochoidea (Superfamily)
> Trochidae (Family)
> Monodontinae (Subfamily)
> Diloma (Genus)
> aridum (Species)
Genus Synonyms:
=Anisodiloma Finlay, 1926
=Cavodiloma Finlay, 1926
=Fractarmilla Finlay, 1926
=Melagraphia Gray, 1847
=Monodonta (Neodiloma) P. Fischer, 1885
=Neodiloma P. Fischer, 1885
=Trochus (Diloma) Philippi, 1845
=Zediloma Finlay, 1926
=Zediloma (Fractarmilla) Finlay, 1926
Synonymised Names:
=Zediloma arida Finlay, 1926
Details: Diloma aridum (Finlay, 1926)
Size/Grows to:
Height 19mm, Width 17mm
Distribution:
Throughout New Zealand. Chatham and Auckland Islands. On sheltered mid-tidal rocks
Notes:
Marine, Native - Endemic, Purplish-black with pale yellow flecks
Distribution Map
 
References and Publications
  • Spencer, H.G. Sep/2009 Name changes for some common intertidal snails, Poirieria, 34 (p.6)
  • Spencer, H.G., Marshall, B.A., Waters, J.M. 2009 Systematics and phylogeny of a new cryptic species of Diloma Philippi (Mollusca: Gastropoda: Trochidae) from a novel habitat, the bull kelp holdfast communities of Southern New Zealand, Invertebrate Systematics, 23 (p.21)
  • Powell, A.W.B. 1979 New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland (p.53)
  • Finlay, H. 1926 A Further Commentary on New Zealand Molluscan Systematics, Transactions and Proceedings of the Royal Society of New Zealand, 57 (p.353) Original Description

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

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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