Species Images
Chatham Islands, in beach drift. 6mm
Chatham Islands, in beach drift. 5mm
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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 =

Roseaplagis mortenseni (Odhner, 1924)

Classification:Gastropoda - Vetigastropoda
Size/Grows to:Width 6mm, Height 7mm
Synonyms:(=Cantharidus Montfort)
(=morioria Powell, =archibenthicola Dell)
Distribution:South Island. From Otago south to Stewart Island. Chatham, Auckland, Campbell, Antipodes and Bounty Islands. In beach drift. Living at 10-244 metres
Geographical Range:CFMAnE.
References and Publications:
  • Donald, K.M., Spencer, H.G. 2016: Phylogeographic patterns in New Zealand and temperate Australian cantharidines (Mollusca: Gastropoda: Trochidae: Cantharidinae): Trans-Tasman divergences are ancient, Molecular Phylogenetics and Evolution, 100 (p.341)
  • Marshall, B.A. 1998: The New Zealand Recent species of Cantharidus Montfort, 1810 and Micrelenchus Finlay, 1926 (Mollusca: Gastropoda: Trochidae), Molluscan Research, 19 (p.144)
  • Powell, A.W.B. 1979: New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland (p.56)

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

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