{{Short description|Species of gastropod}} {{Speciesbox | image = Eastern White Slippersnail (Crepidula plana) Top (16276130746).jpg | image_caption = | genus = Crepidula | species = plana | authority = Say, 1822 | synonyms_ref = | synonyms = }}
'''''Crepidula plana''''', common name the '''eastern white slippersnail''', is a species of sea snail, a marine gastropod mollusk in the family Calyptraeidae, the slipper snails or slipper limpets, cup-and-saucer snails, and hat snails.<ref name="WoRMS">{{WRMS species|160230|''Crepidula plana'' Say, 1822|||Rosenberg, G. (2010). Crepidula plana Say, 1822. Accessed through: World Register of Marine Species at <nowiki>http://www.marinespecies.org/aphia.php?p=taxdetails&id=160230</nowiki> on 2010-06-03}}</ref> This species is characterized by a flat white shell, a white body, and development that includes a planktotrophic larval stage. This species often occurs inside large gastropod shells that are inhabited by hermit crabs. In this case the shells are often extremely flat, and often recurved.
Like all slipper snails, ''Crepidula plana'' is a filter feeder. They brood their offspring in clusters of transparent capsules between the substrate, the propodium and the neck.
''Crepidula plana'' is native to the East Coast of North America, where it ranges from Canada to North Carolina. It has also been reported as introduced into San Francisco Bay. Reports of this species in the Gulf of Mexico or south of North Carolina are incorrect, and result from taxonomic confusion with other flat white species of ''Crepidula'', including ''Crepidula atrasolea'', and ''Crepidula depressa''.
==Distribution== In the past, ''Crepidula plana'' has been reported to range from 48°N to 38°S; 97.75°W to 34.9°W.<ref name="WoRMS 2010"/> Much of this distribution information is incorrect, because it has not been updated to reflect the current taxonomic understanding of this group of similar species.
The distribution has been reported to include: * Canada: Nova Scotia, New Brunswick<ref name="WoRMS 2010"/> * USA: Massachusetts, New York, New Jersey, Maryland, Virginia, North Carolina, South Carolina, Georgia, East Florida, West Florida, Louisiana, Flower Garden Banks (East & West), Texas<ref name="WoRMS 2010"/> * Mexico: Tamaulipas, Tabasco, Veracruz, Campeche State, Cayo Arcas, Campeche, Yucatán State, Campeche Bank, Alacran Reef, Quintana Roo<ref name="WoRMS 2010"/> * Costa Rica<ref name="WoRMS 2010"/> * Panama<ref name="WoRMS 2010"/> * Colombia<ref name="WoRMS 2010"/> * Venezuela: Gulf of Venezuela, Sucre, Isla Margarita<ref name="WoRMS 2010"/> * Bermuda<ref name="WoRMS 2010"/> * Jamaica<ref name="WoRMS 2010"/> * Virgin Islands: St. Croix<ref name="WoRMS 2010"/> * St. Vincent & the Grenadines: Grenada<ref name="WoRMS 2010"/> * Surinam<ref name="WoRMS 2010"/> * Brazil: Amapa, Ceara, Pernambuco, Rio de Janeiro, São Paulo<ref name="WoRMS 2010"/>
'''However,''' since the 1980s, DNA sequence data, allozyme data and developmental data have provided evidence that the flat white ''Crepidula'' from Eastern North America is composed to at least three distinct species. '''''C. plana'' actually ranges''' only from Nova Scotia and New Brunswick south to Georgia or northern Florida. Records of ''C. plana'' in Southern Florida and the Gulf of Mexico are almost certainly misidentified ''C. atrasolea'' or ''C. depressa''. The identity of the flat white ''Crepidula'' species which occurs south of the Gulf of Mexico (in the Caribbean) needs to be re-examined, as it is certainly not ''C. plana''.<ref>{{cite journal|last=Collin|first=Rachel|title=Blackwell Science, Ltd The effects of mode of development on phylogeography and population structure of North Atlantic Crepidula (Gastropoda: Calyptraeidae)|journal=Molecular Ecology|year=2001|volume=10|pages=2249–2262|doi=10.1046/j.1365-294X.2001.01372.x|pmid=11555267|issue=9|s2cid=38276489}}</ref><ref>{{cite journal|last=Collin|first=Rachel|title=Phylogeny of the Crepidula plana (Gastropoda: Calyptraeidae) cryptic species complex in North America|journal=Canadian Journal of Zoology|year=2000|volume=78|issue=8|pages=1500–1514|doi=10.1139/z00-058}}</ref>
==Description== The shell is flat and white, the internal septum is flat, and there are no muscle scars inside the shell. The length of the shell is 15 to 35 mm.<ref name="WoRMS 2010"/> The maximum recorded shell length is 43 mm.<ref name="Welch 2010">{{cite journal | last1 = Welch | first1 = J. J. | year = 2010 | title = The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence | journal = PLoS ONE | volume = 5 | issue = 1| article-number = e8776 | doi = 10.1371/journal.pone.0008776 | pmid=20098740 | pmc=2808249| bibcode = 2010PLoSO...5.8776W | doi-access = free }}</ref>
''Crepidula plana'' produces planktotrophic larvae.
==Habitat== The minimum recorded depth for this species is 0 m; the maximum recorded depth is 110 m.<ref name="Welch 2010"/>
==References== This article incorporates CC-BY-SA-3.0 text from the reference <ref name="WoRMS 2010">Rosenberg, G. (2010). ''Crepidula plana'' Say, 1822. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=160230 on 2011-01-13</ref> {{Reflist}}
==External links== *https://www.stri.si.edu/sites/collinlab/tree_species/group_c_plana.html *https://www.stri.si.edu/sites/collinlab/tree_species/details.php?id=15
{{Taxonbar|from=Q3174948}}
Category:Calyptraeidae Category:Gastropods described in 1822