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Seguenzioidea

{{Short description|Superfamily of gastropods}}

{{Automatic taxobox

| fossil_range = {{fossil range|Cretaceous|Recent|ref={{cite book|last1=Lindberg|first1=edited by Winston F. Ponder, David R.|title=Phylogeny and evolution of the Mollusca|date=2008|publisher=University of California Press|location=Berkeley|isbn=978-0-520-25092-5}}}}

| image = Perrinia concinna 003.jpg

| image_caption = An apertural view of a shell of Perrinia concinna (family Chilodontidae)

| taxon = Seguenzioidea

| authority = Verrill, 1884

| synonyms_ref =

| synonyms =

| type_genus =

| subdivision_ranks = Families

| subdivision = See text

}}

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{{cite journal

|author1=Bouchet, P. |author2=Rocroi, J.-P.

|name-list-style=amp | year = 2005

| title = Classification and Nomenclator of Gastropod Families

| journal = Malacologia

| volume =47

| issue = 1–2

}}

Description

File:Three live Chilodontaidae gastropods.jpg

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.[http://docserver.ingentaconnect.com/deliver/connect/umrsmas/00074977/v49n1/s49.pdf?expires=1369928888&id=74401970&titleid=10983&accname=Guest+User&checksum=8A1DBAA5A294BA597FCC6300E3EDAA2A 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)]{{dead link|date=May 2018 |bot=InternetArchiveBot |fix-attempted=yes }}

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. {{doi|10.1093/mollus/eyp037}}. 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:[http://www.marinespecies.org/aphia.php?p=taxdetails&id=224565 WoRMS : Seguenzioidea; accessed : 1 October 2010]

;Unassigned to a family:

;Unassigned genera brought into synonymy:

References

{{Reflist}}

  • 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
  • [http://docserver.ingentaconnect.com/deliver/connect/umrsmas/00074977/v49n1/s49.pdf?expires=1369928888&id=74401970&titleid=10983&accname=Guest+User&checksum=8A1DBAA5A294BA597FCC6300E3EDAA2A 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)]{{dead link|date=May 2018 |bot=InternetArchiveBot |fix-attempted=yes }}

{{Taxonbar|from=Q2285470}}

Category:Vetigastropoda