# Pyramidelloidea

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{{Short description|Superfamily of gastropods}}
{{Automatic taxobox
| name =Pyramidelloidea
| image = Turbonilla acutissima.png
| image_caption = live ''[Turbonilla acutissima](/source/Turbonilla_acutissima)''
| image2 = Pyramidella maculosa - D'Orbigny.jpg
| image2_caption = Two views of a [shells](/source/gastropod_shell) of ''[Pyramidella acus](/source/Pyramidella_acus)''
| taxon =  Pyramidelloidea
| authority = [J. E. Gray](/source/John_Edward_Gray), 1840<ref>{{cite book 
  | last = Gray
  | first = J. E.
  | title = Synopsis of the contents of the British Museum
  | edition = 42nd
  | publisher = London
  | date = 1840
  | pages =370 pp
  | isbn =
}}</ref>
}}

'''Pyramidelloidea''' is a [superfamily](/source/Taxonomic_rank) of mostly very small [sea snail](/source/sea_snail)s, [marine](/source/marine_(ocean)) [gastropod](/source/gastropod) [mollusk](/source/mollusk)s and [micromollusk](/source/micromollusk)s within the clade [Panpulmonata](/source/Panpulmonata).<ref name="Jörger 2010"/>

This is a voluminous [taxon](/source/taxon): above the species level close to 400 named taxa are referred to this gastropod superfamily.

Pyramidelloidea has both [fossil](/source/fossil) and recent members. They live as [ectoparasite](/source/ectoparasite)s on [bivalve](/source/bivalve) molluscs and [polychaete](/source/polychaete) worms, and have a sharp, piercing [stylet](/source/Stylet_(anatomy)) instead of a [radula](/source/radula).<ref name=IZ>{{cite book |author= Barnes, Robert D. |year=1982 |title= Invertebrate Zoology |publisher= Holt-Saunders International |location= Philadelphia, PA|pages= 376|isbn= 0-03-056747-5}}</ref>

==Distribution==
This taxon is found worldwide.

==Taxonomy ==

=== 1999 taxonomy ===
Taxonomy by Schander, Van Aartsen & Corgan (1999):<ref>{{cite journal
 | author = Schander, C.
 | author2 = van Aartsen, J. J.
 | author3 = Corgan, J. C.
 | year = 1999
 | title = Families and genera of the Pyramidelloidea (Mollusca: Gastropoda)
 | journal = Bollettino Malacologico
 | volume =34
 | issue = 9–12
 | pages = 145–166
 | issn = 
 | doi =
 }}</ref>

*Superfamily Pyramidelloidea Gray, 1840
**Family [Amathinidae](/source/Amathinidae) Ponder, 1987
**Family [Ebalidae](/source/Ebalidae) Warén, 1994 - synonym: Anisocyclidae van Aartsen, 1995
**Family [Odostomiidae](/source/Odostomiidae) [Pelseneer](/source/Paul_Pelseneer), 1928
***Subfamily [Odostomiinae](/source/Odostomiinae) Pelseneer, 1928
***Subfamily [Chrysallidinae](/source/Chrysallidinae) Saurin, 1958
***Subfamily [Odostomellinae](/source/Odostomellinae) Saurin, 1958
***Subfamily [Cyclostremellinae](/source/Cyclostremellinae) Moore, 1966
**Family [Pyramidellidae](/source/Pyramidellidae) J. E. Gray, 1840
***Subfamily [Pyramidellinae](/source/Pyramidellinae) J.E. Gray, 1840
***Subfamily [Sayellinae](/source/Sayellinae) Wise, 1996
**Family [Syrnolidae](/source/Syrnolidae) Saurin, 1958
***Subfamily [Syrnolinae](/source/Syrnolinae) Saurin, 1958
***Subfamily [Tiberiinae](/source/Tiberiinae) Saurin, 1958
**Family [Turbonillidae](/source/Turbonillidae) Bronn, 1849
***Subfamily [Turbonillinae](/source/Turbonillinae) Bronn, 1849
***Subfamily [Eulimellinae](/source/Eulimellinae) Saurin, 1958
***Subfamily [Cingulininae](/source/Cingulininae) Saurin, 1959

=== 2005 taxonomy ===
Pyramidelloidea has been classified within the informal group [Lower Heterobranchia](/source/Lower_Heterobranchia) in the [taxonomy of Bouchet & Rocroi](/source/Taxonomy_of_the_Gastropoda_(Bouchet_%26_Rocroi%2C_2005)) (2005).<ref name="Bouchet 2005">{{Bouchet 2005}}</ref>

Taxonomy of Bouchet & Rocroi, 2005:
*Superfamily Pyramidelloidea
**Family [Pyramidellidae](/source/Pyramidellidae)
**Family [Amathinidae](/source/Amathinidae)
** † Family [Heteroneritidae](/source/Heteroneritidae)
**Family [Murchisonellidae](/source/Murchisonellidae)

=== 2010 taxonomy ===
Jörger et al. (2010)<ref name="Jörger 2010"/> have [redefined major groups within the Heterobranchia](/source/Heterobranchia) and they moved Pyramidelloidea to [Panpulmonata](/source/Panpulmonata).<ref name="Jörger 2010">Jörger K. M., Stöger I., Kano Y., Fukuda H., Knebelsberger T. & Schrödl M. (2010). "On the origin of Acochlidia and other enigmatic euthyneuran gastropods, with implications for the systematics of Heterobranchia". ''[BMC Evolutionary Biology](/source/BMC_Evolutionary_Biology)'' '''10''': 323. {{doi|10.1186/1471-2148-10-323|doi-access=free}}.</ref>

== Pyramidelloidean genera of uncertain familial position ==
* ''[Bidentata](/source/Bidentata)'' <small>de Castellanos, 1982</small>
* ''[Calyptopolyptychia](/source/Calyptopolyptychia)'' <small>Gougerot, 1968</small>
* ''[Laeviselica](/source/Laeviselica)'' <small>Gougerot & Le Renard, 1977</small>
* ''[Lysacme](/source/Lysacme)'' <small>Dall & Bartsch, 1904</small>
* ''[Microthyca](/source/Microthyca)'' <small>A. Adams, 1863</small>
* ''[Oopyramis](/source/Oopyramis)'' <small>Thiele, 1930</small>
* ''[Sulcorinella](/source/Sulcorinella)'' <small>Dall & Bartsch, 1904</small>

== References ==
{{Reflist}}

{{Taxonbar|from=Q141156}}

Category:Panpulmonata
Category:Ectoparasites
Category:Marine gastropods
Category:Taxa named by John Edward Gray

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Adapted from the Wikipedia article [Pyramidelloidea](https://en.wikipedia.org/wiki/Pyramidelloidea) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Pyramidelloidea?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.