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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
N =
North Island
S =
South Island
E =
Endemic
I =
Introduced
Gastropoda - Vetigastropoda - (Vetigastropoda) - Family: Trochidae

Trochidae: Trochinae

 

Genus: Clanculus (Clanculopsis)

 
Height 8mm, Width 9.5mm
Kermadec Islands, low tide to 15 metres, under stones [K.E.]
 

Genus: Clanculus (Euclanculus)

 
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)

 
Height 12mm, Width 12mm
Northland to East Cape. In beach drift and below low tide to over 25 metres [AE.]

Genus: Coelotrochus

 
Coelotrochus carinatus (Marshall, 1998)
Width 4.3mm, Height 3.8mm
Off Three Kings Islands, off Cape Reinga. Off White Island [AE.]
 
Coelotrochus carmesinus (Webster, 1908)
Height 6mm, Width 8mm
Northland to East Cape. Rare, under stones 12-15 metres, and in beach drift [AE.]
Coelotrochus chathamensis (Hutton, 1873) (=aucklandica E.A.Smith, =cookiana Powell, =dunedinensis Suter)
Height 7mm, Width 9mm
Southern North Island, Stewart, Chatham and southern Islands [CFMAnE.]
Coelotrochus davegibbsi Marshall, 1998
Width 6.5mm
Off Three Kings Islands 18-123 metres, and north of Cape Reinga 88 metres [AE.]
Coelotrochus oppressus (Hutton, 1878)
Height 5.5mm, Width 6mm
Three Kings Islands, North Island to Mahia [ACE.]
Coelotrochus polychromus Marshall, 1998
Width 5.9mm
Off Three Kings Islands, 14-88 metres [AE.]
 
Coelotrochus rex Marshall, 1998
Width 5.8mm, Height 4.3mm
Off Three Kings Islands, 102-440 metres [AE.]
 
Coelotrochus tiaratus Quoy & Gaimard, 1834
Width 18mm, Height 15mm
North, South and Stewart Island [ACFE.]
Coelotrochus viridis (Gmelin, 1791)
Width 30mm, Height 25mm
North, South, Stewart and Chatham Islands [ACFME.]

Genus: Tectus

 
Tectus royanus (Iredale, 1912)
Height 101mm, Width 102mm
Raoul Island, Kermadec Islands, on rocks from low water to 6-8 metres, dead specimens to 29 metres [K.E.]
 

Genus: Trochus (Camelotrochus)

 
Width 13mm, Height 11mm
Off Three Kings Islands, Northland to East Cape. 0-228 metres and in beach drift [AE.]

Trochidae: Cantharidinae

 

Genus: Cantharidus

 
Cantharidus capillaceus (Philippi, 1848) (=coruscans Hedley)
Height 28mm, Width 20mm
Auckland, Campbell and Antipodes Islands [An]
Cantharidus dilatatus (G.B.Sowerby II, 1870)
Height 8mm, Width 8mm
North, South, Stewart and Chatham Islands. On kelp at low tide to about 5 metres [ACFME.]
Cantharidus festivus (Marshall, 1998)
Height 6.2mm
Off Three Kings Islands and off Cape Reinga, Far North, 13-88 metres [AE.]
 
Cantharidus opalus (Martyn, 1784) (=cannoni Powell, 1933)
Height 50mm, Width 38mm, Opal Top Shell
North, South, Stewart and Chatham Islands. Littoral to moderate depths [ACFME.]

Genus: Cantharidus (Pseudomargarella)

 
Cantharidus (Pseudomargarella) antipoda (Hombron & Jacquinot, 1854) (=roseus Hutton, =hinemoa Powell)
Width 12mm, Height 10mm
South Island, Otago to Stewart Island, Snares, Campbell, Auckland and Antipodes Islands. Under kelp holdfasts [FAnE.]
Width 8mm, Height 8mm
Chatham Islands, intertidal to shallow water [ME.]
Width 11mm, Height 11mm
Macquarie Island [AnE.]
 
Height 5.0mm, Width 5.5mm, Distinct flattened base
South Island [CFE.]
 
Width 9mm, Height 8mm
Stewart Island. On seaweed covered rocks [FE.]

Genus: Micrelenchus

 
Micrelenchus huttonii (E.A.Smith, 1876) (=tenebrosus Adams)
Height 11.5mm
Bay of Islands south, and Stewart Island. 0-7 metres, Inhabits sheltered waters, especially Zostera, sea-grass, on tidal flats and sheltered rock pools [ACFE.]
 
Micrelenchus sanguineus (Gray in Dieffenbach, 1843) (=cryptus Powell)
Height 8mm, Width 7mm
North, South and Stewart Island [ACFE.]
Micrelenchus tenebrosus A.Adams, 1853 (=parcipictus Powell)
Height 11mm, Width 10mm, Coastal, open water on seaweed and under kelp holdfasts
Southern North Island, South and Stewart Island. Under stones in coastal regions [ACFE.]
Micrelenchus tesselatus (A.Adams, 1851)
Height 9mm, Width 8mm
North, South, Stewart and Chatham Islands [ACFE.]

Genus: Micrelenchus (Mawhero)

 
Height 26mm, Width 16mm
Off Three Kings Islands, 5-33 metres on algae. Middlesex Bank and King Bank, 7-805 metres [AE.]
Height 35mm, Width 21mm
North and South Island. On seaweed at low tide to about 120 metres [ACE.]

Genus: Roseaplagis

 
Roseaplagis artizona A.Adams, 1853 (=elongatus Suter, =micans Suter, =bakeri Fleming)
Width 6mm, Height 8mm
Southern North Island to Stewart Island [CFE.]
Roseaplagis caelata Hutton, 1884
Height 6.0mm, Width 5.0mm
Otago to Stewart Island, Snares Islands [FE.]
Roseaplagis mortenseni (Odhner, 1924) (=morioria Powell, =archibenthicola Dell)
Width 6mm, Height 7mm
South Island. From Otago south to Stewart Island. Chatham, Auckland, Campbell, Antipodes and Bounty Islands. In beach drift. Living at 10-244 metres [CFMAnE.]
Roseaplagis rufozona A.Adams, 1853
Height 8mm, Width 7mm
North Island to Cook Strait. In shell sand [ACE.]

Trochidae: Fossarininae

 

Genus: Fossarina

 
Fossarina rimata (Hutton, 1884)
Width 5mm, Height 4mm
Northern half of North Island, to Mahia [ACE.]

Trochidae: Monodontinae

 

Genus: Diloma

 
Diloma aethiops (Gmelin, 1791) (=lugubris Gmelin)
Width 30mm, Height 28mm
North, South, Stewart and Chatham Islands [ACFME.]
Diloma aridum (Finlay, 1927)
Width 17mm, Height 19mm, Black with pale yellow flecks
Throughout New Zealand. Chatham and Auckland Islands. On sheltered mid-tidal rocks [ACFMAnE.]
Diloma bicanaliculatum (Dunker in Philippi, 1844) (=lenior Finlay)
Width 18mm, Height 17mm
North, South and Stewart Island. Under stones at low tide [ACFE.]
Diloma coracinum (Philippi, 1851) (=excavata Adams & Angas)
Width 12mm, Height 12mm
North and upper South Island [ACFE.]
Diloma durvillaea Spencer, Marshall & Waters, 2009
Width 13mm, Height 12mm, Green area bordering columellar wall
South Island. From Lyttelton Harbour south, under holdfasts & on blades of Durvillaea antarctica & adjacent rocks near low tide level [CFAnE.]
 
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)
Width 25mm, Height 25mm
North, South and Stewart Island [ACFE.]
Diloma zelandicum (Quoy & Gaimard, 1834)
Width 25mm, Height 20mm
North, South and Stewart Island [ACFE.]
 

Trochidae: Stomatellinae

 

Genus: Stomatella

 
Stomatella oliveri (Iredale, 1912)
Height 3.5mm, Length 11.75mm, Width 6.5mm
Raoul Island, Kermadec Islands, living among rocks near low water to 45 metres [K.E.]
 

Trochidae: Umboniinae

 

Genus: Antisolarium

 
Antisolarium egenum (Gould, 1849)
Height 5.5mm, Width 7.5mm
North, South, Stewart and Chatham Islands. Shallow water to about 100 fathoms [ACFME.]

Genus: Monilea

 
Monilea incerta Iredale, 1912
Kermadec Islands [K.E.]
 

Genus: Zethalia

 
Zethalia zelandica (Hombron & Jacquinot, 1855)
Width 26mm, Height 15mm, Wheel Shell
North, South, Stewart and Chatham Islands. Lower littoral to sublittoral [ACFME.]