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Temporal range: Cretaceous–Recent[1]
Perrinia concinna 003.jpg
An apertural view of a shell of Perrinia concinna (family Chilodontidae)
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Vetigastropoda
Superfamily: Seguenzioidea
Verril, 1884

See text

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


The distinctive characteristics of the shells of the Seguenzioidea are:


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[edit]

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[edit]

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]

Unassigned genera brought into synonymy


  1. ^ 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. 
  2. ^ Gofas, S. (2010). Seguenzioidea. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at on 2011-01-09
  3. ^ Bouchet, P. & Rocroi, J.-P. (2005). "Classification and Nomenclator of Gastropod Families". Malacologia. 47 (1–2). 
  4. ^ 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)
  5. ^ 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.
  6. ^ Salvini-Plawén and G. Haszprunar. 1987. The Vetigastropoda and the systematics of streptoneurous gastropods (Mollusca). J. Zool. (London) A211: 747-770
  7. ^ 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.
  8. ^ 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.
  9. ^ WoRMS : Seguenzioidea; accessed : 1 October 2010