Roseaplagis Mortenseni
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''Roseaplagis mortenseni'' is a
species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...
of
sea snail Sea snails are slow-moving marine (ocean), marine gastropod Mollusca, molluscs, usually with visible external shells, such as whelk or abalone. They share the Taxonomic classification, taxonomic class Gastropoda with slugs, which are distinguishe ...
in the
family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...
Trochidae The Trochidae, common name top-snails or top-shells, are a family of various sized sea snails, marine gastropod molluscs in the subclass Vetigastropoda. This family is commonly known as the top-snails because in many species the shell resembles ...
, the top snails. The shell grows to a length of 7 mm. This marine species occurs off
New Zealand New Zealand () is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and List of islands of New Zealand, over 600 smaller islands. It is the List of isla ...
, the
Antipodes Islands The Antipodes Islands (, ) are inhospitable and uninhabited volcanic islands in subantarctic waters to the south of – and territorially part of – New Zealand. The archipelago lies to the southeast of Stewart Island / Rakiura, and to the ...
and the
Bounty Islands The Bounty Islands (; "Island of angry wind") are a small group of uninhabited granite islets and numerous rocks, with a combined area of circa in the South Pacific Ocean. Territorially part of New Zealand, they lie about east-south-east o ...
.


References

* Odhner, N.H. (1924) Papers from Dr. Th. Mortensen's Pacific Expedition 1914–1916. XIX. New Zealand Mollusca. Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening i Kjobenhavn, 77, 1–90, 2 pls. * Dell, R. K. (1956). ''The archibenthal Mollusca of New Zealand''. Dominion Museum Bulletin. 18: 1-235. * Powell, A.W.B. 1979: ''New Zealand Mollusca: Marine, Land and Freshwater Shells''. Collins, Auckland 500p (p. 56) * Marshall, B.A. 1998: ''The New Zealand Recent species of Cantharidus Montfort, 1810 and Micrelenchus Finlay, 1926 (Mollusca: Gastropoda: Trochidae).'' Molluscan Research 19: 107-156 (p. 144) mortenseni Gastropods described in 1924 {{Trochidae-stub