# Hemitoma

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{{Short description|Genus of gastropods}}
{{Automatic taxobox
| image = Hemitoma.jpg
| image_caption = A shell of a ''Hemitoma'' species from New Zealand, anterior end to the bottom
| taxon = Hemitoma
| authority = [Swainson](/source/William_Swainson), 1840
| subdivision_ranks = Species
| subdivision = See text
| synonyms = ''Subemarginula'' <small>[Gray](/source/John_Edward_Gray), 1847</small>
| type_species= ''Emarginula tricostata'' <small>[Sowerby I](/source/George_Brettingham_Sowerby_I), 1823</small>
}}

'''''Hemitoma''''' is a [genus](/source/genus) of slit [limpet](/source/limpet)s, [marine](/source/marine_(ocean)) [gastropod](/source/gastropod) [mollusc](/source/mollusc)s in the [family](/source/Family_(taxonomy)) [Fissurellidae](/source/Fissurellidae), the keyhole limpets and slit limpets.<ref name="WoRMS">Bouchet, P.; Rosenberg, G. (2012). Hemitoma Swainson, 1840. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=206771 on 2013-01-16</ref>

In this genus of fissurellid, there is an inconspicuous notch at the anterior end of the shell rather than a slit. The notch is best seen in an interior view of the shell.

==Species==
Species within the genus ''Hemitoma'' include:<ref>{{Cite web | url=https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=69618 | title=ITIS - Report: Hemitoma }}</ref>
* ''[Hemitoma australis](/source/Hemitoma_australis)'' <small>([Quoy](/source/Jean_Ren%C3%A9_Constant_Quoy) & [Gaimard](/source/Joseph_Paul_Gaimard), 1832)</small>
* ''[Hemitoma bella](/source/Hemitoma_bella)''  <small>[Gabb](/source/William_More_Gabb), 1865</small>

According to the [World Register of Marine Species](/source/World_Register_of_Marine_Species) (WoRMS) the following species names have been accepted <ref>[http://www.marinespecies.org/aphia.php?p=taxlist WoRMS : Hemitoma]</ref>
* ''[Hemitoma cumingii](/source/Hemitoma_cumingii)'' <small>[Sowerby II](/source/George_Brettingham_Sowerby_II), 1863</small> 
* ''[Hemitoma imbricata](/source/Hemitoma_imbricata)'' <small>([Adams](/source/Arthur_Adams_(zoologist)), 1851)</small>
* ''[Hemitoma octoradiata](/source/Hemitoma_octoradiata)'' <small>([Gmelin](/source/Johann_Friedrich_Gmelin), 1791)</small>
* ''[Hemitoma polygonalis](/source/Hemitoma_polygonalis)'' <small>([Adams](/source/Arthur_Adams_(zoologist)), 1852)</small>

The Indo-Pacific Molluscan Database also includes the following species with names in current use <ref>[http://clade.ansp.org/obis/search.php/5891 OBIS : Hemitoma]</ref>
* ''[Hemitoma arabica](/source/Hemitoma_arabica)'' <small>([Adams](/source/Arthur_Adams_(zoologist)), 1852)</small>
* ''[Hemitoma modesta](/source/Hemitoma_modesta)'' <small>([Adams](/source/Henry_Adams_(zoologist)), 1872)</small>
* ''[Hemitoma subrugosa](/source/Hemitoma_subrugosa)'' <small>[Thiele](/source/Johannes_Thiele_(zoologist)), 1916</small>
* ''[Hemitoma simpla](/source/Hemitoma_simpla)'' <small>Christiaens, 1987</small>
;Subgenus ''Montfortia'', <small>[Récluz](/source/C%C3%A9sar_Auguste_R%C3%A9cluz), 1843</small>: accepted as the genus ''[Montfortia](/source/Montfortia)'' <small>Récluz, 1843</small>
* ''[Hemitoma cratitia](/source/Hemitoma_cratitia)'' <small>([Adams](/source/Arthur_Adams_(zoologist)), 1852)</small>
; Subgenus ''Montfortista'', <small>[Iredale](/source/Tom_Iredale), 1929</small>
* ''[Hemitoma oldhamiana](/source/Hemitoma_oldhamiana)'' <small>(Nevill, 1869)</small>

;Species brought into synonymy:
* ''Hemitoma emarginata'' <small>(Blainville, 1825)</small>: synonym of  ''[Montfortia emarginata](/source/Montfortia_emarginata)'' <small>(Blainville, 1825)</small>
* ''Hemitoma excentrica'' <small>([Iredale](/source/Tom_Iredale), 1929)</small>: synonym of ''[Montfortista excentrica](/source/Montfortista_excentrica)'' <small>([Iredale](/source/Tom_Iredale), 1929)</small>
* ''Hemitoma hermosa'' <small>Lowe, 1935</small>: synonym of ''[Montfortia hermosa](/source/Montfortia_hermosa)'' <small>(Lowe, 1935)</small>
* ''Hemitoma livescens'' <small>([Reeve](/source/Lovell_Augustus_Reeve), 1865)</small>: synonym of ''[Cellana livescens](/source/Cellana_livescens)'' <small>([Reeve](/source/Lovell_Augustus_Reeve), 1855)</small>
* ''Hemitoma natlandi'' <small>Durham, 1950</small>: synonym of ''[Octomarginula natlandi](/source/Octomarginula_natlandi)'' (<small>Durham, 1950)</small>
* ''Hemitoma panhi'' <small>([Quoy](/source/Jean_Ren%C3%A9_Constant_Quoy) & [Gaimard](/source/Joseph_Paul_Gaimard), 1834)</small>: synonym of ''[Montfortista panhi](/source/Montfortista_panhi)'' <small>([Quoy](/source/Jean_Ren%C3%A9_Constant_Quoy) & [Gaimard](/source/Joseph_Paul_Gaimard), 1834)</small>
* ''Hemitoma profunda'' <small>([Deshayes](/source/G%C3%A9rard_Paul_Deshayes), 1863)</small>: synonym of ''[Eoacmaea profunda](/source/Eoacmaea_profunda)'' <small>([Deshayes](/source/G%C3%A9rard_Paul_Deshayes), 1863)</small>
* ''Hemitoma rubida'' <small>[Verrill](/source/Addison_Emery_Verrill), 1850</small>: synonym of ''[Hemitoma octoradiata](/source/Hemitoma_octoradiata)'' <small>([Gmelin](/source/Johann_Friedrich_Gmelin), 1791)</small>
* ''Hemitoma subemarginata'' <small>(Blainville, 1819)</small>: synonym of ''[Montfortia subemarginata](/source/Montfortia_subemarginata)'' (<small>Blainville, 1819)</small>
*'' Hemitoma tricarinata'' <small>(Born, 1778)</small>: synonym of ''[Amathina tricarinata](/source/Amathina_tricarinata)'' <small>([Linnaeus](/source/Carl_Linnaeus), 1767)</small>

==References==
{{Commons category|Hemitoma}}
{{Reflist}}
* Vaught, K.C. (1989). ''A classification of the living Mollusca''. American Malacologists: Melbourne, FL (USA). {{ISBN|0-915826-22-4}}. XII, 195 pp. 
* McLean J.H. (2011) ''Reinstatement of the fissurellid subfamily Hemitominae, with the description of new genera, and proposed evolutionary lineage, based on morphological characters of shell and radula (Gastropoda: Vetigastropoda).'' Malacologia 54(1-2): 407-427
* ITIS [https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=69618]
* Worms [http://www.marinespecies.org/aphia.php?p=taxdetails&id=215221]

{{Taxonbar|from=Q16983012}}

Category:Fissurellidae

[nl:Emarginula](/source/nl%3AEmarginula)

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