Seguenzioidea is a superfamily of sea snails, marine gastropod mollusks 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: 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.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 radular 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 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.
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
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 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
Kano, Y. 2008: Vetigastropod phylogeny and a new concept of Seguenzioidea: Independent evolution of copulatory organs in the deep-sea habitats. Zoologica Scripta 37: 1-21 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)