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Snail Identification Workshop Waterford July 2009

Cepaea nemoralis. Snail Identification Workshop Waterford July 2009. Roy Anderson. What are snails?. Land snails belong to the Phylum Mollusca which includes snails, slugs, bivalves, squid and octopus

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Snail Identification Workshop Waterford July 2009

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  1. Cepaea nemoralis Snail Identification WorkshopWaterford July 2009 Roy Anderson

  2. What are snails? • Land snails belong to the Phylum Mollusca which includes snails, slugs, bivalves, squid and octopus • Within the huge variety of molluscs there are a number of Classes: land snails belong to the Gastropoda or gastropods, literally mouth-foot animals because they crawl on a foot which contains the mouth

  3. What are snails? • The gastropods in turn are made of animals with or without a thin, horny flap, the operculum, which closes off the shell aperture when the animal has retreated • Those with an operculum are the in Subclass Prosobranchia. Prosobranchsare mostly marine but we have 2 land snails, Acicula fusca and Pomatias elegans Acicula fusca [point snail]- size 2.8mm

  4. What are snails? • The remaining snails are in Subclass Pulmonata, the pulmonates • Pulmonates mostly have shells into which they retreat. Those that do not are slugs. We have two semi-slugs, Semilimax pyrenaicus and Vitrina pellucida, which cannot fully retreat into their shells A semi-slug, Semilimax pyrenaicus

  5. Snail structures

  6. Shell structures

  7. Teeth etc.

  8. Counting whorls

  9. Size & shape

  10. Family Key[pictorial] Merdigera obscura

  11. Family Key[pictorial]

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