Gastropoda
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Gastropods, commonly known as slugs and snails, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda.
Cepaea nemoralis: a European pulmonate land snail, which has been introduced to many other countries
The shell of Zonitoides nitidus, a small land snail, has dextral coiling, which is typical (but not universal) of gastropod shells.
The upper pair of tentacles on the head of Helix pomatia have eye spots, but the main sensory organs of the snail are sensory receptors for olfaction, situated in the epithelium of the tentacles.
Limpet
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Limpets are a group of aquatic snails with a conical 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, limpets are a polyphyletic group.
The true limpet species Patella vulgata on a rock surface in Wales
Underside of a Patella vulgata specimen
SEM images of the different shapes of teeth in the following limpet species: (A) Nacella mytilina; (B) N. clypeater; (C) N. chiloensis; (D) N. deaurata; (E) N. delicatissima; (F) N. magellanica; (G) N. venosa
Limpet homescar found at the Bay of Skaill