The species is mobile, moving around on the shore to feed. The species occurs on all British and Irish coasts, including lower salinity areas such as estuaries where nutrient loading is likely to be higher than elsewhere. & Ryland, J.S. To interrogate UK data visit the NBN Atlas. Campbell, A., 1994. Outer lip of aperture tangential to body whorl; inner lip thick, reflected over base of columella; no spout or canal interrupts the apertural edge. Miscellaneous records held on the Cofnod database. Merseyside BioBank., 2018. Occurrence dataset: https://doi.org/10.15468/h1ln5p accessed via GBIF.org on 2018-09-25. Anatomy of Littorina. Outer Hebrides Biological Recording, 2018. The annual life cycle, high fecundity and long planktonic larval stage means that successful recruitment from other populations is quite likely. 2]. Occurrence dataset: https://doi.org/10.15468/mopwow accessed via GBIF.org on 2018-10-01. St Andrews BioBlitz 2014. In sheltered conditions they can also be found in sandy or muddy habitats such as estuaries and mud-flats. St Andrews BioBlitz 2015. National Trust, 2017. Zoological Journal of the Linnean Society, 119, 83-265. National Trust Species Records. Newcomb's littorine snail is found within coastal environments, clinging to the rocky shores in the upper intertidal zone. Conchological Society of Great Britain & Ireland, 2018. Gardner, J.P.A., & Thomas, M.L.H., 1987. Erlandsson, J. Centre for Environmental Data and Recording, 2018. 2.]. Shell smooth, especially in older specimens, but has prosocline growth lines and numerous, slight spiral ridges. Oxford: Oxford University Press. Cofnod – North Wales Environmental Information Service, 2018. Merseyside BioBank Active Naturalists (unverified). Mollusc (marine) data for Great Britain and Ireland. During exposure to the air, feeding and locomotion are halted unless conditions are very damp. Occurrence dataset: https://doi.org/10.15468/ab4vwo accessed via GBIF.org on 2018-10-02. & Fioroni, P., 1996. species is readily available, being common on rocky coasts in Europe and the American northeast above the Middle Atlantic States. Lancashire Environment Record Network, 2018. Helgolander Meeresuntersuchungen, 50, 105-115. Brill/Dr W. Backhuys. Bristol Regional Environmental Records Centre, 2017. Conversely decreased emergence will extend the species range further up the shore. BRERC species records recorded over 15 years ago. Biol Invasions. NBIS Records to December 2016. are usually in the range of 4–6. Occurrence dataset: https://doi.org/10.15468/xtrbvy accessed via GBIF.org on 2018-09-27. Littorina obtusata, the smooth or flat periwinkle, received its name for the texture of its shell and the flattened shape of its spire. Centre for Environmental Data and Recording, 2018. IBIS Project Data. http://www.mcmaster.ca/inabis98/oxidative/english0445/, 2000-05-17. Merseyside BioBank (unverified). Yorkshire Wildlife Trust Shoresearch. Habitat-Associations of Turban Snails on Intertidal and Subtidal Rocky Reefs. Habitat selection and migratory behaviour of the intertidal gastropod Littorina littorea (L.) Journal of Animal Ecology, 46, 79-92. Habitat differences in marine invasions of central California. 276.]. Kent Wildlife Trust Shoresearch Intertidal Survey 2004 onwards. When exposed to either extreme cold or heat while climbing, a periwinkle will withdraw into its shell and start rolling, which may allow it to fall to the water. Cambridge: Cambridge University Press. Cofnod – North Wales Environmental Information Service, 2018. Isle of Man historical wildlife records 1995 to 1999. Cephalic tentacles rather flat and broad, with many transverse black stripes. The MarLIN approach was used for assessments from 1999-2010. Adults are slow crawlers so active immigration of snails is unlikely. 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