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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 =
E =
I =
Mollusca (Phylum) > Gastropoda (Class) > Vetigastropoda (Subclass) > Trochida (Order) > Trochoidea (Superfamily) > Trochidae (Family) > Monodontinae (Subfamily) > Diloma (Genus)
Genus: Dilomamap >
Diloma aethiops (Gmelin, 1791) (=lugubris Gmelin)
Width 30mm, Height 28mm, Endemic
North, South, Stewart and Chatham Islands [ACFM]
Diloma aridum (Finlay, 1927)
Width 17mm, Height 19mm, Endemic. Purplish-black with pale yellow flecks
Throughout New Zealand. Chatham and Auckland Islands. On sheltered mid-tidal rocks [ACFMAn]
Diloma bicanaliculatum (Dunker in Philippi, 1844) (=lenior Finlay)
Width 18mm, Height 17mm, Endemic
North, South and Stewart Island. Under stones at low tide [ACF]
Diloma coracinum (Philippi, 1851) (=excavata Adams & Angas)
Width 12mm, Height 12mm, Endemic
North and upper South Island [ACF]
Diloma durvillaea Spencer, Marshall & Waters, 2009
Width 13mm, Height 12mm, Endemic. Green area bordering columellar wall
South Island. From Lyttelton Harbour south, under holdfasts & on blades of Durvillaea antarctica & adjacent rocks near low tide level [CFAn]
Diloma nigerrimum (Gmelin, 1791) (=digna Finlay, =crusoeana Pilsbry)
Height 26mm, Width 24mm
North, South, Stewart, Chatham, Three Kings and Auckland Islands. On kelp at mid/high tide [ACFMAn]
Diloma subrostratum (Gray in Yate, 1835) (=corrosa A.Adams, =novaezelandiae Anton, =plumbea Hutton)
Width 25mm, Height 25mm, Mudflat Top Shell. Endemic
North, South and Stewart Island [ACF]
Diloma zelandicum (Quoy & Gaimard, 1834)
Width 25mm, Height 20mm, Endemic
North, South and Stewart Island [ACF]