Overview

Distribution

It may be widespread
  • Hayward, P.J.; Ryland, J.S. (Ed.) (1990). The marine fauna of the British Isles and North-West Europe: 1. Introduction and protozoans to arthropods. Clarendon Press: Oxford, UK. ISBN 0-19-857356-1. 627 pp.
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Source: World Register of Marine Species

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Saguenay Fjord; Upper North Shore (between Sept- Iles and Pointe des Monts)
  • North-West Atlantic Ocean species (NWARMS)
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Source: World Register of Marine Species

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Ecology

Habitat

bathyal and circalittoral of the Gulf and estuary
  • North-West Atlantic Ocean species (NWARMS)
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Source: World Register of Marine Species

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Depth range based on 11 specimens in 1 taxon.
Water temperature and chemistry ranges based on 4 samples.

Environmental ranges
  Depth range (m): 5.2 - 41.5
  Temperature range (°C): 7.254 - 10.594
  Nitrate (umol/L): 3.158 - 6.743
  Salinity (PPS): 34.218 - 34.882
  Oxygen (ml/l): 6.158 - 6.364
  Phosphate (umol/l): 0.451 - 0.597
  Silicate (umol/l): 2.413 - 5.019

Graphical representation

Depth range (m): 5.2 - 41.5

Temperature range (°C): 7.254 - 10.594

Nitrate (umol/L): 3.158 - 6.743

Salinity (PPS): 34.218 - 34.882

Oxygen (ml/l): 6.158 - 6.364

Phosphate (umol/l): 0.451 - 0.597

Silicate (umol/l): 2.413 - 5.019
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Wikipedia

Lacuna crassior

Lacuna crassior is a species of sea snail, a marine gastropod mollusk in the family Littorinidae, the winkles or periwinkles.[1]

Distribution[edit source | edit]

Lacuna crassior is a circumboreal and subarctic species that has Britain as its southern limit. It has though be found in the Channel Islands and Roscoff, the edges of its southerly range.[2]

Description[edit source | edit]

Lacuna crassior is yellow in colour and can grow up to 14 × 10 mm in length. The maximum recorded shell length is 14 mm.[3] Its body is very similar in shape to the Lacuna vincta, with a long, broad snout and slender head tentacles. Its foot is elongated, with a double-edged anterior margin and two short, white, metapodial tentacles projecting from below the operculum. These metapodial tentacles are less flattened than those of Lacuna vincta.[4][2]

The Lacuna crassior has a strong shell, with six to seven turreted whorls. Its fine spiral striae and vertical costae are mostly obscured by thick periostracum, but form a series of irregular folds on the shell's last whorl. The umbilicus is occasionally closed and the umbilical groove reduced with the aperture drawn out and angulated at the base of the columella.[2][4]

Habitat[edit source | edit]

It is uncommon and occurs at low water spring tide (LWST), the lower part of the beach that is uncovered only a few times a month during spring tides. It also occurs offshore at a depths greater than 30 metres and up to 90 m. It can be found among stones within mud, sand, gravel and coarser sediments.[2]

Minimum recorded depth is 2 m.[3] Maximum recorded depth is 176 m.[3]

References[edit source | edit]

  1. ^ Lacuna crassior (Montagu, 1803). Gofas, S. (2010). Lacuna crassior (Montagu, 1803). 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=140167 on 6 June 2010.
  2. ^ a b c d Paul Chambers (2008). Channel Island marine molluscs: an illustrated guide to the seashells of Jersey, Guernsey, Alderney, Sark and Herm. Paul Chambers. pp. 83–84. ISBN 978-0-9560655-0-6 
  3. ^ a b c Welch J. J. (2010). "The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence". PLoS ONE 5(1): e8776. doi:10.1371/journal.pone.0008776.
  4. ^ a b "Lacuna crassior". Marine Species Identification Portal. Retrieved 2010-07-24. 
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