Cowrie
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Cowrie or cowry (pl. cowries) is the common name for a group of small to large sea snails, marine gastropod mollusks in the family Cypraeidae, the cowries.
Cowrie
Cowrie (Cypraea chinensis) with fully extended mantle
Shells of various species of cowrie; all but one have their anterior ends pointing towards the top of this image.
Cowrie shells
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.
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.