Lacuna (gastropod)

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Lacuna
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Caenogastropoda
clade Hypsogastropoda
clade Littorinimorpha
Superfamily: Littorinoidea
Family: Littorinidae
Genus: Lacuna
Turton, 1827
Synonyms[1]
  • Aquilonaria Dall, 1886
  • Boetica Dall, 1918
  • Epheria Leach, 1847
  • Haloconcha Dall, 1886
  • Lacuna (Lacunella) Dall, 1884 (non Deshayes, 1861)
  • Lacunaria Dall, 1885 (non Conrad, 1866)
  • Lacunitunica Golikov & Gulbin, 1978

Lacuna is a genus of sea snails, marine gastropod mollusks in the family Littorinidae, the winkles or periwinkles.[1]

Description[edit]

The spiral animal body is elongated. The mouth has a proboscis with two thick lips and a spiral, filiform tongue. There are two slender, contractile tentacles with the eyes on small pedicels near their base. The foot is oval and somewhat broader behind.

The thin shell has an ovate-conical or subglobose shape and is covered with a delicate horny periostracum. It has a short spire with convex whorls that are rapidly expanding. The last whorl is ventricose, i.e. inflated in the middle. The apex is rather obtuse. The oval or roundish aperture is covered with a horny, spirally marked operculum. The peristome is incomplete behind. The columella is flattened and forms with the peristome an elongated groove continued from the umbilicus. This groove is bounded internally by the decurved margin of the pillar.[2]

Species[edit]

Species within the genus Lacuna include:

Species brought into synonymy 
  • Lacuna azonata Locard, 1886: synonym of Megalomphalus azoneus (Brusina, 1865)
  • Lacuna cossmanni Locard, 1897 : synonym of Benthobia tryonii Dall, 1889
  • Lacuna macmurdensis Hedley, 1911 : synonym of Trilirata macmurdensis (Hedley, 1911)
  • Lacuna mediterranea Monterosato, 1869 : synonym of Ersilia mediterranea (Monterosato, 1869)
  • Lacuna neritoidea Gould, 1840 : synonym of Lacuna pallidula (da Costa, 1778)
  • Lacuna notorcadensis Melvill & Standen, 1907:[26] synonym of Laevilitorina wandelensis (Lamy, 1905)
  • Lacuna pallidula var. patula Hanley in Thorpe, 1844: synonym of Lacuna pallidula (da Costa, 1778)
  • Lacuna puteolus (Turton, 1819) : synonym of Lacuna parva (da Costa, 1778)

References[edit]

  1. ^ a b Lacuna Turton, 1827. Reid, David G.; Gofas, S. (2010). Lacuna Turton, 1827. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=138099 on 4 March 2011.
  2. ^ Macgillivray, William, History of the molluscous animals of Scotland; London, 1844
  3. ^ Lacuna abyssicola Melvill & Standen, 1912.  Retrieved through: World Register of Marine Species on 6 June 2010.
  4. ^ Lacuna carinifera A. Adams, 1851.  Retrieved through: World Register of Marine Species on 6 June 2010.
  5. ^ Lacuna crassior (Montagu, 1803).  Retrieved through: World Register of Marine Species on 6 June 2010.
  6. ^ Lacuna decotata A. Adams, 1861.  Retrieved through: World Register of Marine Species on 6 June 2010.
  7. ^ Lacuna latifasciata A. Adams, 1863.  Retrieved through: World Register of Marine Species on 6 June 2010.
  8. ^ Lacuna lepidula A. Adams, 1863.  Retrieved through: World Register of Marine Species on 6 June 2010.
  9. ^ Lacuna lukinii (Golikov & Gulbin, 1985).  Retrieved through: World Register of Marine Species on 6 June 2010.
  10. ^ Lacuna marmorata Dall, 1919.  Retrieved through: World Register of Marine Species on 6 June 2010.
  11. ^ Lacuna minor (Dall, 1919).  Retrieved through: World Register of Marine Species on 6 June 2010.
  12. ^ Lacuna orientalis (Golikov & Gulbin, 1985).  Retrieved through: World Register of Marine Species on 6 June 2010.
  13. ^ Lacuna pallidula (da Costa, 1778).  Retrieved through: World Register of Marine Species on 6 June 2010.
  14. ^ Lacuna parva (da Costa, 1778).  Retrieved through: World Register of Marine Species on 6 June 2010.
  15. ^ Lacuna porrecta Carpenter, 1864.  Retrieved through: World Register of Marine Species on 6 June 2010.
  16. ^ Lacuna reflexa (Dall, 1884).  Retrieved through: World Register of Marine Species on 6 June 2010.
  17. ^ Lacuna setonaikaiensis (Habe, 1958).  Retrieved through: World Register of Marine Species on 6 June 2010.
  18. ^ Lacuna smithii Pilsbry, 1895.  Retrieved through: World Register of Marine Species on 6 June 2010.
  19. ^ Lacuna succinea Berry, 1953.  Retrieved through: World Register of Marine Species on 6 June 2010.
  20. ^ Lacuna turneri (Dall, 1886).  Retrieved through: World Register of Marine Species on 6 June 2010.
  21. ^ Lacuna turrita A. Adams, 1861.  Retrieved through: World Register of Marine Species on 6 June 2010.
  22. ^ Lacuna uchidai (Habe, 1953).  Retrieved through: World Register of Marine Species on 6 June 2010.
  23. ^ Lacuna unifasciata Carpenter, 1856.  Retrieved through: World Register of Marine Species on 6 June 2010.
  24. ^ Lacuna variegata Carpenter, 1864.  Retrieved through: World Register of Marine Species on 6 June 2010.
  25. ^ Lacuna vincta (Montagu, 1803).  Retrieved through: World Register of Marine Species on 6 June 2010.
  26. ^ Lacuna notorcadensis Melvill & Standen, 1907.  Retrieved through: World Register of Marine Species on 6 June 2010.
  • Reid, D.G. (1989a) The comparative morphology, phylogeny and evolution of the gastropod family Littorinidae. Philosophical Transactions of the Royal Society of London, Series B 324: 1-110

External links[edit]