''Emarginula'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

of small keyhole

limpet Limpets are a group of aquatic snails with a conical gastropod shell, shell shape (patelliform) and a strong, muscular foot. This general category of conical shell is known as "patelliform" (dish-shaped). Existing within the class Gastropoda, ...

s, marine

gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...

mollusc Mollusca is a phylum of protostome, protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant taxon, extant species of molluscs are recognized, making it the second-largest animal phylum ...

s in the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Fissurellidae Fissurellidae, common name the keyhole limpets and slit limpets, is a taxonomic family of small to medium-sized limpet-like sea snails, marine gastropod molluscs in the clade Vetigastropoda.Rosenberg, G. (2012). Fissurellidae. Accessed throu ...

.Bouchet, P.; Gofas, S.; Rosenberg, G. (2012). Emarginula Lamarck, 1801. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138012 on 2013-01-13

Description

The oval shell is obliquely conical with a backward-pointing recurved

apex The apex is the highest point of something. The word may also refer to: Arts and media Fictional entities * Apex (comics) A-Bomb Abomination Absorbing Man Abraxas Abyss Abyss is the name of two characters appearing in Ameri ...

. There is a deep incision in the anterior margin. A distinct anal fasciole extends upwards from this incision. The surface is latticed, sculptured with radial ribs. There is no

septum In biology, a septum (Latin language, Latin for ''something that encloses''; septa) is a wall, dividing a Body cavity, cavity or structure into smaller ones. A cavity or structure divided in this way may be referred to as septate. Examples Hum ...

inside.

Radula

The radula has a dental formula of [many].1.4.1.4.1.[many], with a wide, rectangular, acuspate rachidian tooth. The various genera have a few dozen rows of teeth.

Species

According to the World Register of Marine Species (WoRMS), species within the genus ''Emarginula'' include: * ''Emarginula adamsiana'' George Brettingham Sowerby II, Sowerby in Arthur Adams (zoologist), Adams & George Brettingham Sowerby II, Sowerby, 1863 * ''Emarginula adriatica'' Costa O.G., 1829 * ''Emarginula agulhasensis'' Johannes Thiele (zoologist), Thiele, 1925 * ''Emarginula alba'' Robert Boog Watson, Watson, 1897 * ''Emarginula amyda'' Shikama, 1962 * ''Emarginula angusta'' McLean, 1970 * ''Emarginula annielangleitae'' Poppe & Tagaro, 2020 * ''Emarginula apolonia'' Pacaud, 2015 * † ''Emarginula auversiensis'' Deshayes, 1861 * ''Emarginula bajula'' Hedley, 1913 * ''Emarginula balicasagensis'' Poppe & Tagaro, 2020 * ''Emarginula bellula'' A. Adams, 1852 * ''Emarginula bicancellata'' Xavier Montrouzier, Montrouzier, 1860 * ''Emarginula bonfittoi'' Smriglio & Mariottini, 2001 * ''Emarginula boucheti'' Poppe & Tagaro, 2020 * † ''Emarginula brebioni'' Ceulemans, Van Dingenen & Landau, 2016 * ''Emarginula camilla'' Melvill & Standen, 1903 * ''Emarginula candida'' Arthur Adams (zoologist), Adams, 1852 * ''Emarginula capuloidea'' G. Nevill & H. Nevill, 1869 * † ''Emarginula carezi'' de Laubrière, 1881 * ''Emarginula choristes'' William Healey Dall, Dall, 1925 * ''Emarginula christiaensi'' Piani, 1985 * ''Emarginula circumalbum'' Poppe & Tagaro, 2020 * † ''Emarginula clathrata'' Deshayes, 1824 * † ''Emarginula clathrataeformis'' Eichwald, 1830 * ''Emarginula colipanoae'' Poppe & Tagaro, 2020 * ''Emarginula compta'' Habe, 1953 * ''Emarginula concinna'' Arthur Adams (zoologist), Adams, 1852 * ''Emarginula connectens'' Johannes Thiele (zoologist), Thiele, 1915 * ''Emarginula connelli'' Kilburn, 1978 * ''Emarginula convexa'' Hedley, 1907 * † ''Emarginula costata'' Lamarck, 1803 * ''Emarginula costulata'' Gérard Paul Deshayes, Deshayes, 1863 * ''Emarginula crassa'' George Brettingham Sowerby I, Sowerby, 1812 * ''Emarginula crassicostata'' George Brettingham Sowerby II, Sowerby in Adams & George Brettingham Sowerby II, Sowerby, 1863 * ''Emarginula cucullata'' A. Adams, 1852 * ''Emarginula curvamen'' Tom Iredale, Iredale, 1925 * ''Emarginula curvata'' Schepman, 1908 *'' Emarginula cuvieri'' Jean Victoire Audouin, Audouin, 1827 (species inquirenda) *'' Emarginula decorata'' Gérard Paul Deshayes, Deshayes, 1863 * † ''Emarginula delicatissima'' Chapman & Gabriel, 1923 * ''Emarginula delonguevilleae'' Poppe & Tagaro, 2020 * † ''Emarginula dennanti'' Chapman & Gabriel, 1923 * ''Emarginula devota'' Johannes Thiele (zoologist), Thiele, 1915 * ''Emarginula dictya'' McLean, 1970 * † ''Emarginula didactica'' Ludbrook, 1956 * † ''Emarginula dilatoria'' Ludbrook, 1956 * ''Emarginula dilecta'' Arthur Adams (zoologist), Adams, 1852 * ''Emarginula divae'' (van Aartsen & Carrozza, 1995) * ''Emarginula dubia'' Mattheus Marinus Schepman, Schepman, 1908 (accepted > unreplaced junior homonym, non ''Emarginula dubia'' Defrance, 1819) * ''Emarginula dujardini'' Dollfus & Dautzenberg, 1886 † * † ''Emarginula espibosensis'' Lozouet, 1999 * † ''Emarginula exigua'' Trautschold, 1866 * ''Emarginula fenestrella'' Gérard Paul Deshayes, Deshayes, 1863 * ''Emarginula fissura'' (Carl Linnaeus, Linnaeus, 10th edition of Systema Naturae, 1758) - slit limpet * † ''Emarginula fossorensis'' Lozouet, 1999 * ''Emarginula foveolata'' Mattheus Marinus Schepman, Schepman, 1908 ** ''Emarginula foveolata fugitai'' Habe, 1953 * † ''Emarginula foveolata'' Gerasimov, 1955 (accepted > unreplaced junior homonym) * ''Emarginula fragilis'' Yokoyama, 1920 * ''Emarginula fuliginea'' Arthur Adams (zoologist), Adams, 1851 * ''Emarginula gabensis'' (Gabriel, 1961) * ''Emarginula galericulata'' A. Adams, 1852 * † ''Emarginula galeriformis'' Marwick, 1928 * † ''Emarginula gigantea'' Poppe, 2008 * †''Emarginula guerangeri'' A. d'Orbigny, 1843 * ''Emarginula gustavi'' Poppe & Tagaro, 2020 * ''Emarginula hataii'' Habe, 1953 * ''Emarginula hawaiiensis'' William Healey Dall, Dall, 1895 * † ''Emarginula haweraensis'' Powell, 1931 * ''Emarginula hosoyai'' Habe, 1953 * ''Emarginula huzardii'' (Charles Payraudeau, Payraudeau, 1826) * ''Emarginula icosisculpta'' Simone & Cunha, 2014 * ''Emarginula imaizumi'' William Healey Dall, Dall, 1926 * ''Emarginula imella'' Dall, 1926 * ''Emarginula janae'' Cossignani, 2020 * ''Emarginula japonica'' George Brettingham Sowerby II, Sowerby in Adams & George Brettingham Sowerby II, Sowerby, 1863 * ''Emarginula jungcheni'' K.-Y. Lai, 2019 * † ''Emarginula kaiparica'' Laws, 1939 * † ''Emarginula kaiwarensis'' Bandel, Gründel & P. A. Maxwell, 2000 † * † ''Emarginula karuna'' Das, Bardhan & Lahiri, 1999 * ''Emarginula kashimaensis'' Shikama, 1962 * † ''Emarginula komitica'' Laws, 1939 * ''Emarginula koon'' Kilburn, 1978 * † ''Emarginula ladowae'' Eichman, 1955 * ''Emarginula lata'' J.R.C. Quoy & J.P. Gaimard, 1834 ((uncertain, status in recent literature not researched) * ''Emarginula lentiginosa'' D. G. Herbert, 2024 * ''Emarginula liuzzii'' Poppe & Tagaro, 2020 * ''Emarginula longifissa'' George Brettingham Sowerby II, Sowerby, 1866 * ''Emarginula lorenzoi'' Giusti & Micali, 2019 * ''Emarginula macclurgi'' Kilburn, 1978 * ''Emarginula mactanensis'' Poppe & Tagaro, 2020 * ''Emarginula maculata'' Arthur Adams (zoologist), Adams in Arthur Adams (zoologist), Adams & George Brettingham Sowerby II, Sowerby, 1863 * ''Emarginula margarita'' Poppe & Tagaro, 2020 * † ''Emarginula mariae'' Cossmann, 1888 * † ''Emarginula maudensis'' Chapman & Gabriel, 1923 * ''Emarginula micans'' Arthur Adams (zoologist), Adams, 1852 * ''Emarginula montrouzieri'' Souverbie, 1872 * ''Emarginula multisquamosa'' Schepman, 1908 * ''Emarginula multistriata'' Jeffreys, 1882 * ''Emarginula natalensis'' Barnard, 1963 * ''Emarginula nodulicostata'' D. G. Herbert, 2024 * ''Emarginula nordica'' Isabel Pérez Farfante, Pérez Farfante, 1947 - northern emarginula * † ''Emarginula oblonga'' Sandberger, 1859 * ''Emarginula obovata'' Arthur Adams (zoologist), Adams, 1852 * ''Emarginula octaviana'' Coen, 1939 * ''Emarginula oppressa'' Barnard, 1963 * ''Emarginula paivana'' (Joseph Charles Hippolyte Crosse, Crosse, 1867) * ''Emarginula papilionacea'' G. Nevill & H. Nevill, 1869 * ''Emarginula patula'' Cotton, 1930 * † ''Emarginula paucicostata'' Laws, 1936 * ''Emarginula paucipunctata'' Mattheus Marinus Schepman, Schepman, 1908 * † ''Emarginula pelagica'' Passy, 1832 * ''Emarginula philippinensis'' Poppe & Tagaro, 2020 * ''Emarginula phrixodes'' William Healey Dall, Dall, 1927 - ruffled emarginula * ''Emarginula pittensis'' Marwick, 1928 * ''Emarginula poppeorum'' Romani & Crocetta, 2017 * † ''Emarginula praesicula'' Lozouet, 1999 * ''Emarginula puncticulata'' Adams, 1852 * ''Emarginula punctulum'' Piani, 1980 * † ''Emarginula punctura'' S. Wood, 1848 * ''Emarginula pustula'' Johannes Thiele (zoologist), Thiele in Küster, 1913 * ''Emarginula quadrata'' Poppe & Tagaro, 2020 * † ''Emarginula radiocostata'' Kiel & Bandel, 2000 * ''Emarginula regia'' Habe, 1953 * ''Emarginula retecosa'' Arthur Adams (zoologist), Adams, 1851 * ''Emarginula retrogyra'' D. G. Herbert, 2024 * ''Emarginula rollandi'' P. Fischer, 1857 (uncertain: status in recent literature not researched) * ''Emarginula rosea'' Bell, 1824 * ''Emarginula salebrosa'' D. G. Herbert, 2024 * † ''Emarginula sanctaecaatharine'' Passy, 1832 * ''Emarginula scabricostata'' A. Adams, 1852 * ''Emarginula scabriuscula'' Arthur Adams (zoologist), Adams, 1852 * ''Emarginula sicula'' John Edward Gray, Gray, 1825 - dagger emarginula * ''Emarginula sinica'' Lu, 1986 * ''Emarginula solidula'' Costa, 1829 * ''Emarginula souverbiana'' Henry Augustus Pilsbry, Pilsbry, 1890 *'' Emarginula spinosa'' Gérard Paul Deshayes, Deshayes, 1863 * † ''Emarginula squammata'' Grateloup, 1836 * † ''Emarginula striatissima'' Traub, 1979 * ''Emarginula striatula'' Jean René Constant Quoy, Quoy and Joseph Paul Gaimard, Gaimard, 1834 - dagger emarginula * ''Emarginula sublaevis'' Schepman, 1908 * ''Emarginula subtilitexta'' Verco, 1908 * ''Emarginula superba'' Hedley, 1906 * ''Emarginula suspira'' Simone & Cunha, 2014 * ''Emarginula tenera'' Arnould Locard, Locard, 1892 * † ''Emarginula teneraeformis'' Lozouet, 1999 * ''Emarginula tenuicostata'' George Brettingham Sowerby II, Sowerby, 1863 * ''Emarginula teramachii'' Habe, 1953 * ''Emarginula textilis'' Augustus Addison Gould, Gould, 1859 in 1859-61 * ''Emarginula thomasi'' Joseph Charles Hippolyte Crosse, Crosse, 1864 * ''Emarginula thorektes'' Kilburn, 1978 * ''Emarginula tosaensis'' Habe, 1953 * †''Emarginula transenna'' Tenison Woods, 1877 * ''Emarginula tuberculosa'' Libassi, 1859 - tuberculate emarginula * ''Emarginula undulata'' Melvill & Standen, 1903 * ''Emarginula velascoensis'' Shasky, 1961 * ''Emarginula velascoi'' Rehder, 1980 * ''Emarginula viridibrunneis'' Poppe & Tagaro, 2020 * ''Emarginula viridicana'' Herbert & Kilburn, 1985 * ''Emarginula viridis'' Poppe & Tagaro, 2020 * † ''Emarginula wannonensis'' G. F. Harris, 1897 * † ''Emarginula washingtoniana'' Squires & Goedert, 1994 * ''Emarginula xishaensis'' Lu, 1986 * ''Emarginula yangeorum'' Poppe & Tagaro, 2020

Synonyms

* ''Emarginula altilis'' Augustus Addison Gould, Gould, 1859: synonym of ''Variemarginula punctata'' (A. Adams, 1852) * ''Emarginula amitina'' Tom Iredale, Iredale, 1925: synonym of ''Emarginula dilecta'' A. Adams, 1852 * ''Emarginula angustata'' Johannes Thiele (zoologist), Thiele, 1915: synonym of ''Tugali decussata'' A. Adams, 1852 * ''Emarginula arabica'' A. Adams, 1852: synonym of ''Octomarginula arabica'' (A. Adams, 1852) * ''Emarginula arconatii'' Issel, 1869: synonym of ''Montfortista panhi'' (Quoy & Gaimard, 1834) * ''Emarginula australis'' Quoy & Gaimard, 1834: synonym of ''Montfortia subemarginata'' (Blainville, 1819) * ''Emarginula bella'' Gabb, 1865: synonym of ''Scelidotoma bella'' (Gabb, 1865) * ''Emarginula biangulata'' George Brettingham Sowerby III, Sowerby, 1901: synonym of ''Emarginella biangulata'' (G. B. Sowerby III, 1901) * † ''Emarginula blainvillii'' Defrance, 1825: synonym of † ''Rimula blainvillii'' (Defrance, 1825) * ''Emarginula brevirimata'' Gérard Paul Deshayes, Deshayes, 1862: synonym of ''Montfortula brevirimata'' (Deshayes, 1862) * ''Emarginula clathrata'' A. Adams & Reeve, 1850: synonym of ''Montfortista panhi'' (Quoy & Gaimard, 1834) * ''Emarginula clathrata'' Pease, 1863: synonym of ''Emarginula dilecta'' A. Adams, 1852 * ''Emarginula conica'' Jean-Baptiste Lamarck, Lamarck, 1801: synonym of ''Emarginula fissura'' (Linnaeus, 1758) * ''Emarginula conica'' Schumacher, 1817 non Lamarck, 1801: synonym of ''Emarginula rosea'' Bell, 1824 * ''Emarginula dentigera'' Heilprin, 1889: synonym of ''Hemimarginula dentigera'' (Heilprin, 1889) * ''Emarginula elata'' Arnould Locard, Locard, 1898: synonym of ''Emarginula christiaensi'' Piani, 1985 * ''Emarginula elongata'' O. G. Costa, 1829: synonym of ''Emarginula octaviana'' Coen, 1939 * ''Emarginula eximia'' A. Adams, 1852: synonym of ''Emarginella eximia'' (A. Adams, 1852) * ''Emarginula flindersi'' Cotton, 1930: synonym of ''Emarginula convexa'' Hedley, 1907 * ''Emarginula fuliginea'' Kuroda, 1941: synonym of ''Variemarginula variegata'' (A. Adams, 1852) * ''Emarginula guernei'' Dautzenberg & Fischer, 1896: synonym of ''Emarginula tuberculosa'' Libassi, 1859 * ''Emarginula hedleyi'' Thiele, 1915: synonym of ''Emarginula candida'' A. Adams, 1852 * ''Emarginula incisula''(sic): synonym of ''Emarginella incisura'' (A. Adams, 1852) * ''Emarginula incisura'' A. Adams, 1852: synonym of ''Emarginella incisura'' (A. Adams, 1852) * ''Emarginula kimberti'' Cotton, 1930: synonym of ''Laeviemarginula kimberti'' (Cotton, 1930) * ''Emarginula modesta'' H. Adams, 1872: synonym of ''Hemimarginula modesta'' (H. Adams, 1872) * ''Emarginula muelleri'' Forbes & Hanley, 1849: synonym of ''Emarginula fissura'' (Linnaeus, 1758) * ''Emarginula ostheimerae'' Abbott, 1958: synonym of ''Octomarginula ostheimerae'' (Abbott, 1958) * ''Emarginula panhi'' Quoy & Gaimard, 1834: synonym of ''Montfortista panhi'' (Quoy & Gaimard, 1834) * ''Emarginula papillosa'' Antoine Risso, Risso 1826: synonym of ''Emarginula huzardii'' Payraudeau, 1826 * ''Emarginula parmophoidea'' Quoy & Gaimard, 1834: synonym of ''Tugali elegans'' John Edward Gray, Gray, 1843 * ''Emarginula peasei'' Thiele, 1915: synonym of ''Emarginula dilecta'' A. Adams, 1852 * ''Emarginula phrygium'' Herbert & Kilburn, 1985: synonym of ''Agariste phrygium'' (Herbert & Kilburn, 1986) (original combination) * ''Emarginula picta'' Dunker, 1860: synonym of ''Montfortula picta'' (Dunker, 1860) * ''Emarginula pileata'' Gould, 1859: synonym of ''Variemarginula punctata'' (A. Adams, 1852) * ''Emarginula pileum'' Heilprin, 1889: synonym of ''Hemimarginula pileum'' (Heilprin, 1889) * ''Emarginula planulata'' A. Adams, 1852: synonym of ''Emarginella planulata'' (A. Adams, 1852) * ''Emarginula polygonalis'' A. Adams, 1852: synonym of ''Hemitoma polygonalis'' (A. Adams, 1852) * ''Emarginula pulchreclathrata'' Tomlin, 1932: synonym of ''Emarginula agulhasensis'' Thiele, 1925 * ''Emarginula pumila'' A. Adams, 1852: synonym of ''Hemimarginula pumila'' (A. Adams, 1852) * ''Emarginula punctata'' A. Adams, 1852: synonym of ''Variemarginula punctata'' (A. Adams, 1852) * ''Emarginula reticulata'' Sowerby, 1813: synonym of ''Emarginula fissura'' (Linnaeus, 1758) * ''Emarginula rugosa'' Quoy & Gaimard, 1834: synonym of ''Montfortula rugosa'' (Quoy & Gaimard, 1834) * ''Emarginula scutellata'' Deshayes, 1863: synonym of ''Octomarginula scutellata'' (Deshayes, 1863) * ''Emarginula sibogae'' Schepman, 1908: synonym of ''Emarginella sibogae'' (Schepman, 1908) * ''Emarginula simpla'' Christiaens, 1987: synonym of ''Hemimarginula simpla'' (Christiaens, 1987) * ''Emarginula stellata'' A. Adams, 1852: synonym of ''Montfortula rugosa'' (Quoy & Gaimard, 1834) * ''Emarginula subclathrata'' Pilsbry, 1890: synonym of ''Emarginula dilecta'' A. Adams, 1852 * ''Emarginula subemarginata'' Blainville, 1819: synonym of ''Montfortia subemarginata'' (Blainville, 1819) * ''Emarginula subrugosa'' Thiele, 1916: synonym of ''Hemimarginula subrugosa'' (Thiele, 1916) * ''Emarginula sulcifera'' A. Adams, 1852: synonym of ''Montfortulana sulcifera'' (A. Adams, 1852) * ''Emarginula tricarinata'' Pilsbry, 1890: synonym of ''Montfortista panhi'' (Quoy & Gaimard, 1834) * ''Emarginula tricostata'' G.B. Sowerby I, 1823: synonym of ''Hemitoma octoradiata'' (Gmelin, 1791) * ''Emarginula vadososinuata'' Yokoyama, 1922: synonym of ''Tugalina vadososinuata'' (Yokoyama, 1922) * ''Emarginula vadum'' Barnard, 1963: synonym of ''Emarginula undulata'' Melvill & Standen, 1903 * ''Emarginula variegata'' A. Adams, 1852: synonym of ''Variemarginula variegata'' (A. Adams, 1852)

References

* * Arthur William Baden Powell, Powell A W B, ''New Zealand Mollusca'', HarperCollins, William Collins Publishers Ltd, Auckland, New Zealand 1979 * Piani P. (1985). ''Revisione del genere Emarginula Lamarck, 1801 in Mediterraneo''. Lavori, Società Italiana di Malacologia 21: 193-238 * Gofas, S.; Le Renard, J.; Bouchet, P. (2001). Mollusca, in: Costello, M.J. et al. (Ed.) (2001). ''European register of marine species: a check-list of the marine species in Europe and a bibliography of guides to their identification''. Collection Patrimoines Naturels, 50: pp. 180–213 * Rolán E., 2005. ''Malacological Fauna From The Cape Verde Archipelago. Part 1, Polyplacophora and Gastropoda.'' * Spencer, H.; Marshall. B. (2009). ''All Mollusca except Opisthobranchia''. In: Gordon, D. (Ed.) (2009). New Zealand Inventory of Biodiversity. Volume One: Kingdom Animalia. 584 pp {{Taxonbar, from=Q3176224 Fissurellidae Gastropod genera Taxa named by Jean-Baptiste Lamarck