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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.
K=
Kermadec Islands
A=
Aupourian - Kaipara Harbour, north around North Cape, encompassing the Three Kings Islands and south to East Cape
C=
Cookian - Lower North Island and the northern part of the South Island
F=
Forsterian - Otago, Fiordland and Stewart Island
M=
Moriorian - Chatham Islands, Pitt Island
An=
Antipodean - Subantarctic Islands of New Zealand
FW =
Freshwater
L =
Land
E =
Endemic
I =
Introduced
Gastropoda (Phylum) > Mollusca (Subphylum) > Vetigastropoda (Subclass) > Trochida (Order) > Trochoidea (Superfamily) > Trochidae (Family)
Trochidae: Trochinae
 
Genus: Clanculus (Clanculopsis)map >
Height 8mm, Width 9.5mm, Endemic
Kermadec Islands, low tide to 15 metres, under stones [K.]
Genus: Clanculus (Euclanculus)map >
Clanculus (Euclanculus) persica Habe & Shikama, 1964
Width 25mm
Off Choshi, Chiba Prefecture, Honshu, Japan, and off Kermadec Islands 235-280 metres [K.]
Genus: Clanculus (Paraclanculus)map >
Height 12mm, Width 12mm, Endemic
Northland to East Cape. In beach drift and below low tide to over 25 metres [A]
Genus: Coelotrochusmap >
Coelotrochus carinatus (Marshall, 1998)
Width 4.3mm, Height 3.8mm, Endemic
Off Three Kings Islands, off Cape Reinga. Off White Island [A]
Coelotrochus carmesinus (Webster, 1908)
Height 6mm, Width 8mm, Endemic
Northland to East Cape. Rare, under stones 5-20 metres, and in beach drift [A]
Coelotrochus chathamensis (Hutton, 1873) (=aucklandica E.A.Smith, =cookiana Powell, =dunedinensis Suter)
Height 7mm, Width 9mm, Endemic
Southern North Island, Stewart, Chatham and southern Islands [CFMAn]
Coelotrochus davegibbsi Marshall, 1998
Width 6.5mm, Endemic
Off Three Kings Islands 18-123 metres, and north of Cape Reinga 88 metres [A]
Coelotrochus oppressus (Hutton, 1878)
Height 5.5mm, Width 6mm, Endemic
Three Kings Islands, North Island to Mahia [AC]
Coelotrochus polychromus Marshall, 1998
Width 5.9mm, Endemic
Off Three Kings Islands, 14-88 metres [A]
Coelotrochus rex Marshall, 1998
Width 5.8mm, Height 4.3mm, Endemic
Off Three Kings Islands, 102-440 metres [A]
Coelotrochus tiaratus Quoy & Gaimard, 1834
Width 18mm, Height 15mm, Endemic
North, South and Stewart Island [ACF]
Coelotrochus viridis (Gmelin, 1791)
Width 30mm, Height 25mm, Endemic
North, South, Stewart and Chatham Islands [ACFM]
Genus: Tectusmap >
Tectus royanus (Iredale, 1912)
Height 101mm, Width 102mm, Endemic
Raoul Island, Kermadec Islands, on rocks from low water to 6-8 metres, dead specimens to 29 metres [K.]
Genus: Trochus (Camelotrochus)map >
Width 13mm, Height 11mm, Endemic
Off Three Kings Islands, Northland to East Cape. 0-228 metres and in beach drift [A]
Trochidae: Cantharidinae
 
Genus: Cantharidus (Calliotropis)map >
Cantharidus (Calliotropis) capillaceus (Philippi, 1848) (=coruscans Hedley)
Height 28mm, Width 20mm
Auckland, Campbell and Antipodes Islands [An]
Cantharidus (Calliotropis) dilatatus (G.B.Sowerby II, 1870)
Height 8mm, Width 8mm, Endemic
North, South, Stewart and Chatham Islands. On kelp at low tide to about 5 metres [ACFM]
Height 6.2mm, Endemic
Off Three Kings Islands and off Cape Reinga, Far North, 13-88 metres [A]
Cantharidus (Calliotropis) opalus (Martyn, 1784) (=cannoni Powell, 1933)
Height 50mm, Width 38mm, Opal Top Shell. Endemic
North, South, Stewart and Chatham Islands. Littoral to moderate depths [ACFM]
Genus: Cantharidus (Pseudomargarella)map >
Cantharidus (Pseudomargarella) antipoda (Hombron & Jacquinot, 1854) (=roseus Hutton, =hinemoa Powell)
Width 12mm, Height 10mm, Endemic
South Island, Otago to Stewart Island, Snares, Campbell, Auckland and Antipodes Islands. Under kelp holdfasts [FAn]
Width 8mm, Height 8mm, Endemic
Chatham Islands, intertidal to shallow water [M]
Width 11mm, Height 11mm, Endemic
Macquarie Island [An]
Height 5.0mm, Width 5.5mm, Endemic. Distinct flattened base
South Island [CF]
Width 9mm, Height 8mm, Endemic
Stewart Island. On seaweed covered rocks [F]
Genus: Micrelenchus (Micrelenchus)map >
Micrelenchus (Micrelenchus) huttonii (E.A.Smith, 1876) (=tenebrosus Adams)
Height 11.5mm, Endemic
Bay of Islands south, and Stewart Island. 0-7 metres, Inhabits sheltered waters, especially Zostera, sea-grass, on tidal flats and sheltered rock pools [ACF]
Micrelenchus (Micrelenchus) sanguineus (Gray in Dieffenbach, 1843) (=cryptus Powell)
Height 8mm, Width 7mm, Endemic
North, South and Stewart Island [ACF]
Micrelenchus (Micrelenchus) tenebrosus A.Adams, 1853 (=parcipictus Powell)
Height 11mm, Width 10mm, Endemic. Coastal, open water on seaweed and under kelp holdfasts
Southern North Island, South and Stewart Island. Under stones in coastal regions [ACF]
Height 9mm, Width 8mm, Endemic
North, South, Stewart and Chatham Islands [ACF]
Genus: Micrelenchus (Mawhero)map >
Height 26mm, Width 16mm, Endemic
Off Three Kings Islands, 5-33 metres on algae. Middlesex Bank and King Bank, 7-805 metres [A]
Height 35mm, Width 21mm, Endemic
North and South Island. On seaweed at low tide to about 120 metres [AC]
Genus: Roseaplagismap >
Roseaplagis artizona A.Adams, 1853 (=elongatus Suter, =micans Suter, =bakeri Fleming)
Width 6mm, Height 8mm, Endemic
Southern North Island to Stewart Island [CF]
Roseaplagis caelata Hutton, 1884
Height 6.0mm, Width 5.0mm, Endemic
Otago to Stewart Island, Snares Islands [F]
Roseaplagis mortenseni (Odhner, 1924) (=morioria Powell, =archibenthicola Dell)
Width 6mm, Height 7mm, Endemic
South Island. From Otago south to Stewart Island. Chatham, Auckland, Campbell, Antipodes and Bounty Islands. In beach drift. Living at 10-244 metres [CFMAn]
Roseaplagis rufozona A.Adams, 1853
Height 8mm, Width 7mm, Endemic
North Island to Cook Strait. In shell sand [AC]
Trochidae: Fossarininae
 
Genus: Fossarinamap >
Fossarina rimata (Hutton, 1884)
Width 5mm, Height 4mm, Endemic
Northern half of North Island, to Mahia [AC]
Trochidae: Monodontinae
 
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]
Trochidae: Stomatellinae
 
Genus: Stomatellamap >
Stomatella oliveri (Iredale, 1912)
Height 3.5mm, Length 11.75mm, Width 6.5mm, Endemic
Raoul Island, Kermadec Islands, living among rocks near low water to 45 metres [K.]
Trochidae: Umboniinae
 
Genus: Antisolariummap >
Antisolarium egenum (Gould, 1849)
Height 5.5mm, Width 7.5mm, Endemic
North, South, Stewart and Chatham Islands. Shallow water to about 100 fathoms [ACFM]
Genus: Monileamap >
Monilea incerta Iredale, 1912
Endemic
Kermadec Islands [K.]
Genus: Zethaliamap >
Zethalia zelandica (Hombron & Jacquinot, 1855)
Width 26mm, Height 15mm, Wheel Shell. Endemic
North, South, Stewart and Chatham Islands. Lower littoral to sublittoral [ACFM]