Species Images
Found under smooth stones at low tide. 18mm
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Key to 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 approxomation of the range of each species within New Zealand.
Kermadec Islands
Aupourian - Kaipara Harbour, north around North Cape, encompassing the Three Kings Islands and south to East Cape
Cookian - Lower North Island and the northern part of the South Island
Forsterian - Otago, Fiordland and Stewart Island
Moriorian - Chatham Islands, Pitt Island
Antipodean - Subantarctic Islands of New Zealand
FW =
L =
N =
North Island
S =
South Island
E =
I =

Diloma bicanaliculatum (Dunker in Philippi, 1844)

Classification:Gastropoda - Vetigastropoda
Size/Grows to:Width 18mm, Height 17mm
Synonyms:(=Zediloma Finlay, =Anisodiloma Finlay, =Cavodiloma Finlay, =Fractarmilla Finlay, =Melagraphia Gray)
(=lenior Finlay)
Distribution:North, South and Stewart Island. Under stones at low tide
Geographical Range:ACFE.
References and Publications:
  • Williams, S.T., Karube, S., Ozawa, T. 2008: Molecular systematics of Vetigastropoda: Trochidae, Turbinidae and Trochoidea redefined, Zoologica Scripta, 37 (p.487)
  • Donald, K.M., Kennedy, M., Spencer, H.G. 2005: The phylogeny and taxonomy of austral monodontine topshells (Mollusca: Gastropoda: Trochidae), inferred from DNA sequences, Molecular Phylogenetics and Evolution, 37 (p.482)
  • Willan, R.C., Marshall, B.A., Climo, F.M., Cernohorsky, W.O. 1980: Rectification of nomenclature for Melagraphia aethiops (Gmelin) and Diloma bicanaliculata (Dunker) (Mollusca: Trochidae), New Zealand Journal of Marine and Freshwater Research, 14 (p.414)
  • Powell, A.W.B. 1979: New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland (p.54)

Note: Localities are approximate, and represent only some of the known localities for the species.

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