Seguenzioidea is a superfamily of , marine gastropod in the clade Vetigastropoda.[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]
Description
The distinctive characteristics of the shells of the Seguenzioidea are:
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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.
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the protoconch has a trochoid shape.
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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.
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a unique formula with an underlying rhipidoglossate ground plan.
[ 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)]
Taxonomy
Seguenzioidea 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.
[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.] In 1987 Salvini-Plawén and Haszprunar changed its status to the suborder Seguenziina, based on the
formula that they considered to be intermediate between "rhipidoglossate" and "taenioglossate".
[Salvini-Plawén and G. Haszprunar. 1987. The Vetigastropoda and the systematics of streptoneurous gastropods (Mollusca). J. Zool. (London) A211: 747-770] At about the same time in 1987 Goryachev elevated the superfamily to ordinal status Seguenziiformes in the superorder
Littorinimorpha, based on the taenioglossal radula.
[Goryachev, 1987. Ob'em i polozhenie semeistva Seguenziidae (Mollusca, Gastropoda, Seguenziidae) v klasse bryukhonogikh mollyuskov. ''The. 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.]
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)
[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. .] elevated the subfamily Calliotropinae to the family level as the
Calliotropidae, and the subfamily Cataeginae to family level as the
Cataegidae.
The superfamily Seguenzioidea consists of six families:[ WoRMS : Seguenzioidea; accessed : 1 October 2010]
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Cataegidae McLean & Quinn, 1987
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Chilodontaidae Wenz, 1938
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Choristellidae Bouchet & Warén, 1979
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Eucyclidae Koken, 1896
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† Eucycloscalidae Gründel, 2007
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Eudaroniidae Gründel, 2004
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† Eunemopsidae Bandel, 2010
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† Lanascalidae Bandel, 1992
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† Laubellidae Cox, 1960
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Pendromidae Warén, 1991
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† Pseudoturcicidae Bandel, 2010
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† Sabrinellidae Bandel, 2010
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Seguenziidae Verrill, 1884
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Trochaclididae Thiele, 1928
- Unassigned to a family
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Adeuomphalus Seguenza, 1876
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Aequispirella Finlay, 1924
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Akritogyra Warén, 1992
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Anekes Bouchet & Warén, 1979
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Benthobrookula A. H. Clarke, 1961
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Brookula Iredale, 1912
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Eudaronia Cotton, 1945
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Granigyra Dall, 1889
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Lissotesta Iredale, 1915
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Lissotestella Powell, 1946
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Microcarina Laseron, 1954
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Moelleriopsis Bush, 1897
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Notosetia Iredale, 1915
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Palazzia Warén, 1991
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Putilla A. Adams, 1867
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Retigyra Warén, 1989
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Trenchia Knudsen, 1964
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Ventsia Warén & Bouchet, 1993
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Vetulonia Dall, 1913
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Wanganella Laseron, 1954
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Xyloskenea B. A. Marshall, 1988
- Unassigned genera brought into synonymy
