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2 - olfactory epithelium 3 - corneal epithelium 4 - corneal endothelium 5 - retina 6 - layer with rod cells 7 - fibrous connective tissue layer 8 - nerve of the eye: Drawing of cross sections of the extracted tentacle (left) and constricted tentacle (right) with and eye of Helix pomatia. 1 - nerve of an eye 2 - 3 - 4 - eye 5 - tentacle ganglion ...
The snail extends the tentacles by internal pressure of body fluids, and retracts all four tentacles into the head by invagination when threatened or otherwise retreating into its shell. The mouth is located beneath the tentacles, and contains a chitinous radula with which the snail scrapes and manipulates food particles.
The Ohio pebblesnail (Somatogyrus integra) is a species of very small freshwater snail with an operculum. It is an aquatic gastropod mollusc in the family Lithoglyphidae.
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. Main articles: Sensory organs of gastropods and Nervous system of gastropods
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Latiidae - small limpet-like snails confined to New Zealand. [9] One [5] or three species. Acroloxidae - about 40 species. [5] Lymnaeidae - found worldwide, but are most numerous in temperate and northern regions. [9] These are the dextral (right-handed) pond snails. About 100 species. Planorbidae - "rams horn" snails, with a worldwide ...
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Glowing sea creature with 15 tentacles found off Florida coast. It’s a new species ‘Golden’-tailed creature — pregnant with 2 eggs — discovered as new species.