Williamia

Williamia
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Siphonariida
Family:	Siphonariidae
Genus:	Williamia ; Monterosato, 1884
Type species
	Ancyclus gussoniO.G. Costa, 1829;
Species
	See text
Synonyms
	Allerya Mörch, 1877 (Invalid: suppressed by ICZN Opinion 1410); Brondelia Bourguignat, 1862 (Invalid: suppressed by ICZN Opinion 1410); Parascutum Cossmann, 1890; Roya Iredale, 1912; Scutulum Monterosato, 1877 (Invalid: junior homonym of Scutulum Tournouer, 1869 [Echinodermata]; Williamia and Parascutum are replacement names);

Last updated February 17, 2026

Williamia is a genus of small sea snails or false limpets, marine pulmonate gastropod molluscs in the family Siphonariidae, the false (air-breathing) limpets.^[1]

Their development is similar to other Siphonariids.^[2]

Species

Species within the genus Williamia include:

Williamia eximia (Nevill in G. & H. Nevill, 1869)
Williamia gussoni Costa, 1829
Williamia krebsii (Mörch, 1877)
Williamia magellanica Dall, 1927
Williamia peltoides (Carpenter, 1864) - shield false limpet
Williamia radiata (Pease, 1860)
- Williamia radiata nutata Headley, 1908
Williamia subspiralis (Carpenter, 1864)

Species brought into synonymy:

Williamia galapagana Dall : synonym of Williamia peltoides(Carpenter, 1864)
Williamia gussonii(O. G. Costa, 1829): synonym of Williamia gussoni(Costa O. G., 1829)
Williamia japonicaHabe, 1962: synonym of Williamia radiata(Pease, 1860)
Williamia kermadecensis(Iredale, 1912): synonym of Williamia radiata(Pease, 1860)
Williamia nutata(Headley, 1908): synonym of Williamia radiata nutata(Headley, 1908)
Williamia oblongata(Yokoyama, 1926): synonym of Siphonacmea oblongata (Yokoyama, 1926)
Williamia polynesicaRehder, 1980: synonym of Williamia radiata(Pease, 1860)
Williamia radiataKuroda & Habe, in Habe, 1961: synonym of Williamia radiata(Pease, 1860)
Williamia tomlini(Robson, 1913): synonym of Aporemodon tomlini Robson, 1913

References

1 2 Bouchet, P.; Gofas, S. (2011). Williamia Monterosato, 1884. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138490 on 2011-02-08
↑ Collin, Rachel. 2000. The development of three heterobranch mollusks from California, USA. The Nautilus, 114(3): 117-119.

"Williamia". Integrated Taxonomic Information System.
Discover Life
Marshall B.A. (1981) The genus Williamia in the western Pacific (Mollusca: Siphonariidae). New Zealand Journal of Zoology 8: 487-492

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[WoRMS-1] 1 2 Bouchet, P.; Gofas, S. (2011). Williamia Monterosato, 1884. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138490 on 2011-02-08

[2] Collin, Rachel. 2000. The development of three heterobranch mollusks from California, USA. The Nautilus, 114(3): 117-119.

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