Hemitoma

Hemitoma is a genus of slit limpets, marine gastropod molluscs in the family Fissurellidae, the keyhole limpets and slit limpets.

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:

• Hemitoma australis <small>(Quoy & Gaimard, 1832)</small>
• Hemitoma bella <small>Gabb, 1865</small>

According to the World Register of Marine Species (WoRMS) the following species names have been accepted

• Hemitoma cumingii <small>Sowerby, 1863</small>
• Hemitoma imbricata <small>(Adams, 1851)</small>
• Hemitoma octoradiata <small>(Gmelin, 1791)</small>
• Hemitoma polygonalis <small>(Adams, 1852)</small>

The Indo-Pacific Molluscan Database also includes the following species with names in current use

• Hemitoma arabica <small>(Adams, 1852)</small>
• Hemitoma modesta <small>(Adams, 1872)</small>
• Hemitoma subrugosa <small>Thiele, 1916</small>
• Hemitoma simpla <small>Christiaens, 1987</small>

Subgenus Montfortia, <small>Récluz, 1843</small>: accepted as the genus Montfortia <small>Récluz, 1843</small>

• Hemitoma cratitia <small>(Adams, 1852)</small>

Subgenus Montfortista, <small>Iredale, 1929</small>

• Hemitoma oldhamiana <small>(Nevill, 1869)</small>

Species brought into synonymy:

• Hemitoma emarginata <small>(Blainville, 1825)</small>: synonym of Montfortia emarginata <small>(Blainville, 1825)</small>
• Hemitoma excentrica <small>(Iredale, 1929)</small>: synonym of Montfortista excentrica <small>(Iredale, 1929)</small>
• Hemitoma hermosa <small>Lowe, 1935</small>: synonym of Montfortia hermosa <small>(Lowe, 1935)</small>
• Hemitoma livescens <small>(Reeve, 1865)</small>: synonym of Cellana livescens <small>(Reeve, 1855)</small>
• Hemitoma natlandi <small>Durham, 1950</small>: synonym of Octomarginula natlandi (<small>Durham, 1950)</small>
• Hemitoma panhi <small>(Quoy & Gaimard, 1834)</small>: synonym of Montfortista panhi <small>(Quoy & Gaimard, 1834)</small>
• Hemitoma profunda <small>(Deshayes, 1863)</small>: synonym of Eoacmaea profunda <small>(Deshayes, 1863)</small>
• Hemitoma rubida <small>Verrill, 1850</small>: synonym of Hemitoma octoradiata <small>(Gmelin, 1791)</small>
• Hemitoma subemarginata <small>(Blainville, 1819)</small>: synonym of Montfortia subemarginata (<small>Blainville, 1819)</small>
• Hemitoma tricarinata <small>(Born, 1778)</small>: synonym of Amathina tricarinata <small>(Linnaeus, 1767)</small>

References

• Vaught, K.C. (1989). A classification of the living Mollusca. American Malacologists: Melbourne, FL (USA). . 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