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Otukaia
Apertural view of the shell of Otukaia kiheiziebisu
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Vetigastropoda
Order:	Trochida
Superfamily:	Trochoidea
Family:	Calliostomatidae
Genus:	Otukaia Ikebe, 1942
Type species
Calliostoma kiheiziebisu Otuka, 1939
Species
See text

Otukaia is a genus of medium-sized sea snails, which are marine gastropod molluscs in the family Calliostomatidae, the top shells. Otukaia has long been considered a subgenus of Calliostoma and is still treated as such by many taxonomists.

Snails in this genus are characterized by their relatively large, silky-white, thin shell, lacking an umbilicus. Their spiral whorls are flat to slightly convex, with the first three whorls sometimes displaying sculpture that may persist on later whorls. They possess a rachidian radula. These snails can be found worldwide in deep water.

Some authors consider Otukaia Ikebe, 1942, a subgenus of Calliostoma Swainson, 1840.

The (sub)generic name Otukaia honors Japanese malacologist Yanosuke Otuka (1903–1950), who described the type species Calliostoma kiheiziebisu Otuka, 1939.

Species

The following species are accepted in the genus Otukaia:

• Otukaia beringensis Tuskes & R. Clark, 2018
• Otukaia ikukoae Sakurai, 1994
• Otukaia kiheiziebisu (Otuka, 1939)

Species brought into synonymy

• Otukaia blacki Dell, 1956, accepted as Maurea alertae (B. A. Marshall, 1995)
• Otukaia chilena (Rehder, 1971), accepted as Maurea chilena (Rehder, 1971)
• Otukaia crustulum Vilvens & Sellanes, 2006, accepted as Calliotropis crustulum (Vilvens & Sellanes, 2006)
• Otukaia delli McLean & Andrade, 1982, accepted as Maurea delli (McLean & Andrade, 1982)
• Otukaia eltanini Dell, 1990, accepted as Maurea eltanini (Dell, 1990)
• Otukaia rossica (Dall, 1919), accepted as Margarites rossicus Dall, 1919

References

1. Ikebe (1941) Venus 11: 60; Ikebe (1942) Jap. J. geol. geogr. 18(4): 277.
2. WoRMS (2010). Otukaia Ikebe, 1942. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=456482 on 2010-04-22
3. (in Japanese and English) Otuka Y. (1939). "日本産エビスガヒ屬の一新種 A new Calliostoma from Japan". Venus 9(1): 27–29. CiNii.
4. ^ "Otukaia". WoRMS. World Register of Marine Species. Retrieved 2019-01-09.
5. "Gastropods by Eddie Hardy | Conchology". www.gastropods.com. Retrieved 16 June 2010.
6. Vilvens & Sellanes (2006). The Nautilus 120(1): 15-20.

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