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Taxonomy
Family: Subfamily:
CASSIDAE: PHALIINAE
Full Classification:
Mollusca (Phylum)
> Gastropoda (Class)
> Caenogastropoda (Subclass)
> Littorinimorpha (Order)
> Tonnoidea (Superfamily)
> Cassidae (Family)
> Phaliinae (Subfamily)
> Semicassis (Genus)
> royana (Species)
Genus Synonyms:
=Cassis (Semicassis) Mörch, 1852
=Phalium (Semicassis) Mörch, 1852
=Phalium (Xenogalea) Iredale, 1927
=Semicassis (Xenophalium) Iredale, 1927
=Xenogalea Iredale, 1927
=Xenophalium Iredale, 1927
Synonymised Names:
=Cassidea royana Iredale, 1914
=Semicassis (Semicassis) royana (Iredale, 1914) accepted, alternate representation
=Xenophalium ericanum Powell, 1928
=Xenophalium hedleyi Iredale, 1927
Images: Semicassis royana (Iredale, 1914)
From crayfish pot, off Cape Maria van Diemen, Far North, NZ. 128mm
From cray pots off the Far North, NZ. 125mm. © rights reserved
Holotype of Xenophalium ericanum Powell, off Berghens Point, Doubtless Bay, Northland, NZ (MA72168). © Auckland Museum (CC-BY)
Taxonomy
Family: Subfamily:
CASSIDAE: PHALIINAE
Full Classification:
Mollusca (Phylum)
> Gastropoda (Class)
> Caenogastropoda (Subclass)
> Littorinimorpha (Order)
> Tonnoidea (Superfamily)
> Cassidae (Family)
> Phaliinae (Subfamily)
> Semicassis (Genus)
> royana (Species)
Genus Synonyms:
=Cassis (Semicassis) Mörch, 1852
=Phalium (Semicassis) Mörch, 1852
=Phalium (Xenogalea) Iredale, 1927
=Semicassis (Xenophalium) Iredale, 1927
=Xenogalea Iredale, 1927
=Xenophalium Iredale, 1927
Synonymised Names:
=Cassidea royana Iredale, 1914
=Semicassis (Semicassis) royana (Iredale, 1914) accepted, alternate representation
=Xenophalium ericanum Powell, 1928
=Xenophalium hedleyi Iredale, 1927
Details: Semicassis royana (Iredale, 1914)
Size/Grows to:
Height 165mm, Width 88mm
Distribution:
Raoul and Three Kings Islands, and north-eastern North Island as far south-east as Ranfurly Bank, from 0-427m
Notes:
Marine, Native - Non-endemic
Distribution Map
 
References and Publications
  • Brook, F.J., Marshall, B.A. 1998 The coastal molluscan fauna of the northern Kermadec Islands, southwest Pacific Ocean, Journal of the Royal Society of New Zealand, 28 (p.220)
  • Hart, M.R. 1995 Xenophalium royanum Iredale, 1914, New Zealand's prince of helmets, World Shells, 15 (p.104)
  • Powell, A.W.B. 1979 New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland (p.160)
  • Powell, A.W.B. 1976 On the considerable influx of warm water molluscs that have invaded northern New Zealand waters within recent years, Records of the Auckland Institute and Museum, 13 (p.148)
  • Powell, A.W.B. 1967 New Zealand Molluscan Systematics with Descriptions of New Species: Part 6, Records of the Auckland Institute and Museum, 6(3) (p.187)
  • Iredale, T. 1914 Description of a new species of Cassidea, Proceedings of the Malacological Society of London, 11(1) (p.180) Original Description

*98 © Museum of New Zealand Te Papa Tongarewa (CC-BY-NC-ND)

NZ Geographical Regions
Key to symbols used in Checklist.
Fw =
Freshwater
L =
Land
N =
North Island
S =
South Island
R =
Recent
Sf =
Subfossil
Fo =
Fossil
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