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Seguenzioidea; Temporal range: Cretaceous–Recent PreꞒ Ꞓ O S D C P T J K Pg N
	An apertural view of a shell of Perrinia concinna (family Chilodontidae)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Vetigastropoda
Superfamily:	Seguenzioidea; Verrill, 1884
Families
	See text

Seguenzioidea is a superfamily of minute to medium-sized sea snails, marine gastropod mollusks in the clade Vetigastropoda.^[2] ^[3]

Description

Three Seguenziid gastropods

The distinctive characteristics of the shells of the Seguenzioidea are:

the nacreous layer (a plesiomorphic character, i.e. a character state that a taxon is inferred to have been retained from its ancestors) This occurs also in the following families: Pleurotomariidae, Haliotidae, Turbinidae, Trochidae, and possibly in the Skeneidae.
the protoconch has a trochoid shape.
usually with one or more labral sinuses. This character is also found is several other superfamilies such as Neomphaloidea, Pleurotomarioidea, Fissurelloidea, and Scissurelloidea and in the families Siliquariidae and Turridae. Therefore, this characteristic is to be considered autapomorphic.
a unique radular formula with an underlying rhipidoglossate ground plan.^[4]

Taxonomy

This superfamily was placed in part or in whole previously to 1979 either in the Archaeogastropoda near the superfamily Trochoidea or in the Caenogastropoda near the superfamily Stromboidea.^[5] In 1987 Salvini-Plawén and Haszprunar changed its status to the suborder Seguenziina, based on the radular formula that they considered to be intermediate between "rhipidoglossate" and "taenioglossate".^[6] At about the same time in 1987 Goryachev elevated the superfamily to ordinal status Seguenziiformes in the superorder Littorinimorpha, based on the taenioglossal radula.^[7]

2005 taxonomy

2005 taxonomy according to Bouchet & Rocroi, 2005. (Families that are exclusively fossil are indicated with a dagger †.)

Superfamily Seguenzioidea

Family Seguenziidae

Family Chilodontaidae

† Family Eucyclidae

† Family Laubellidae

2007–2009 taxonomy

Kano et al. (2009)^[8] elevated the subfamily Calliotropinae to the family level as the Calliotropidae, and the subfamily Cataeginae to family level as the Cataegidae.^[8]

The superfamily Seguenzioidea consists of six families:^[9]

Cataegidae McLean & Quinn, 1987
Chilodontaidae Wenz, 1938
Choristellidae Bouchet & Warén, 1979
Eucyclidae Koken, 1896
† Eucycloscalidae Gründel, 2007
Eudaroniidae Gründel, 2004
† Eunemopsidae Bandel, 2010
† Lanascalidae Bandel, 1992
† Laubellidae Cox, 1960
Pendromidae Warén, 1991
† Pseudoturcicidae Bandel, 2010
† Sabrinellidae Bandel, 2010
Seguenziidae Verrill, 1884
Trochaclididae Thiele, 1928

Unassigned to a family

- Adeuomphalus Seguenza, 1876 ^[8]
- Aequispirella Finlay, 1924
- Akritogyra Warén, 1992
- Anekes Bouchet & Warén, 1979
- Benthobrookula A. H. Clarke, 1961
- Brookula Iredale, 1912
- Eudaronia Cotton, 1945
- Granigyra Dall, 1889
- Lissotesta Iredale, 1915
- Lissotestella Powell, 1946
- Microcarina Laseron, 1954
- Moelleriopsis Bush, 1897
- Notosetia Iredale, 1915
- Palazzia Warén, 1991
- Putilla A. Adams, 1867
- Retigyra Warén, 1989
- Trenchia Knudsen, 1964
- Ventsia Warén & Bouchet, 1993
- Vetulonia Dall, 1913
- Wanganella Laseron, 1954
- Xyloskenea B. A. Marshall, 1988

Unassigned genera brought into synonymy

Abyssogyra A.H. Clarke, 1961: synonym of Moelleriopsis Bush, 1897
Intortia Egorova, 1972: synonym of Lissotesta Iredale, 1915
Molleriopsis : synonym of Moelleriopsis Bush, 1897

References

^ Lindberg, edited by Winston F. Ponder, David R. (2008). Phylogeny and evolution of the Mollusca. Berkeley: University of California Press. ISBN 978-0-520-25092-5. {{cite book}}: |first1= has generic name (help)CS1 maint: multiple names: authors list (link)
^ ^a ^b Gofas, S. (2010). Seguenzioidea. 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=224565 on 2011-01-09
^ Bouchet, P. & Rocroi, J.-P. (2005). "Classification and Nomenclator of Gastropod Families". Malacologia. 47 (1–2).
^ James F. Quinn Jr., (1991), Systematic Position of Basilissopsis and Guttula, and a Discussion of the Phylogeny of the Seguenzioidea (Gastropoda: Prosobranchia), Bulletin of Marine Science, Volume 49, Numbers 1-2, September 1991 , pp. 575-598(24)^{[permanent dead link‍]}
^ Quin 1983. "A revision of the Seguenziacea Verrill, 1884 (Gastropoda: Prosobranchia). I. Summary and evaluation of the superfamily". Proc. BioI. Soc. Wash. 96(4): 725-757.
^ Salvini-Plawén and G. Haszprunar. 1987. The Vetigastropoda and the systematics of streptoneurous gastropods (Mollusca). J. Zool. (London) A211: 747-770
^ Goryachev, 1987. Ob'em i polozhenie semeistva Seguenziidae (Mollusca, Gastropoda, Seguenziidae) v klasse bryukhonogikh mollyuskov. [The volume and the position of the family Seguenziidae (Mollusca, Gastropoda, Seguenziidae) in the gastropod class]. Pages 21–23 in Va. I. Starobogatov, A. N. Golikov, and 1. M. Likharev, eds. Molluscs. Results and perspectives of investigation. Abstracts of communications. Zoological Institute, Akademiya Nauk SSSR, Leningrad.
^ ^a ^b ^c Kano Y., Chikyu E. & Warén A. (2009) "Morphological, ecological and molecular characterization of the enigmatic planispiral snail genus Adeuomphalus (Vetigastropoda: Seguenzioidea)". Journal of Molluscan Studies 75: 397-418. doi:10.1093/mollus/eyp037.
^ WoRMS : Seguenzioidea; accessed : 1 October 2010