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''Zethalia'' is a
genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
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 ...
s in the subfamily Umboniinae of 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 top snails, first formally named in 1918.


Species

The genus contains one extant (still living) species and two extinct species: * †''Zethalia coronata'' Marwick, 1948 * †''Zethalia russelli'' Marwick, 1965 * '' Zethalia zelandica'' (Hombron & Jacquinot, 1855)


References

* Trew, A., 1984. ''The Melvill-Tomlin Collection. Part 30. Trochacea''. Handlists of the Molluscan Collections in the Department of Zoology, National Museum of Wales. * Vaught, K. C. (1989). ''A classification of the living Mollusca''. Melbourne, Florida : American Malacologists. xii + 189 pp. * {{Trochidae-stub