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Seguenzioidea

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Kingdom
  
Animalia

Phylum
  
Mollusca

Rank
  
Superfamily

Scientific name
  
Seguenzioidea

Higher classification
  
Archaeogastropoda

Seguenzioidea httpsuploadwikimediaorgwikipediacommonsthu

Similar
  
Gastropods, Chilodontidae, Molluscs, Seguenziidae, Vetigastropoda

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

Contents

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 Scissurellidea 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.

    • 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. 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". At about the same time in 1987 Goryachev elevated the superfamily to ordinal status Seguenziiformes in the superorder Littorinimorpha, based on the taenioglossal radula.

    2005 taxonomy

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

    Superfamily Seguenzioidea

    2007–2009 taxonomy

    Kano et al. (2009) 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:

  • Family Calliotropidae
  • Family Cataegidae
  • Family Chilodontidae
  • Family Eucyclidae
  • Family Laubellidae
  • Family Seguenziidae
  • 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

    Seguenzioidea Wikipedia
    (Text) CC BY-SA