Guildfordia yoka

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Guildfordia yoka
Guildfordia yoka delicata 01.JPG
Guildfordia yoka delicata.
Scientific classification e
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Vetigastropoda
Superfamily: Trochoidea
Family: Turbinidae
Genus: Guildfordia
Species: G. yoka
Binomial name
Guildfordia yoka
Jousseaume, 1888 [1]
  • Guildfordia delicata Habe & Okutani, 1983
  • Guildfordia yoca Jousseaume, 1888
  • Guildfordia yoka delicata Habe & Okutani, 1983
  • Guildfordia yoka yoka Jousseaume, 1888
A shell of Guildfordia yoka Jousseaume, 1888, measuring 26.3 mm diameter, trawled at 100 m off Minabe, in Japan.

Guildfordia yoka, the yoka star turban, is a species of deep-water sea snail, a marine gastropod mollusk in the family Turbinidae, the turban snails. [2]

Apical view of a shell of Guildfordia yoka


The size of the shell varies between 70 mm and 105 mm. The color pattern of the shell varies from very light brownish to purple-brown. Some specimens contain only 6 whorls instead of 7 as in the holotype. The upper whorls are smooth, then follows the body whorl with scarcely 2 rows of granules, instead of 7 or 8. Towards the keel it has very irregular radiating ribs, which leave however a nearly smooth zone above the keel, with only a few spiral striae. The base of the shell is less convex than the upper part. Some specimens lack the rose-coloured line round the umbilical callosity. The aperture is oval, thick, with the nucleus in the external lower corner. The outer surface is slightly rugose, by irregular wrinkles, almost parallel with the basal margin of the operculum. The nucleus is marked by an olive spot. [3]


This marine species occurs off Japan and the Philippines, found at depths between 200 m and 300 m.


  1. ^ Jousseaume, Le Naturaliste 1899, p. 48.
  2. ^ Bouchet, P. (2014). Guildfordia yoka Jousseaume, 1888. Accessed through: World Register of Marine Species at on 2014-08-23
  3. ^ M.M. Schepman, The Prosobranchia of the Siboga Expedition pt. 1-3 (1908 ]
  • Alf A. & Kreipl K. (2011) The family Turbinidae. Subfamilies Turbininae Rafinesque, 1815 and Prisogasterinae Hickman & McLean, 1990. In: G.T. Poppe & K. Groh (eds), A Conchological Iconography. Hackenheim: Conchbooks. pp. 1-82, pls 104-245.

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