Planorbarius corneus
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Planorbarius corneus, common name the great ramshorn, is a relatively large species of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails, or planorbids, which all have sinistral or left-coiling shells.
Image: Posthornschnecke 1
Image: Planorbarius corneus 001
Together with a Lymnaea stagnalis snail.
Eggs, not more than one day old, together with several feeding adults. The clutch is 12 millimeters long. Also, a snail's mouth with its radula can be seen clearly.
Radula
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The radula is an anatomical structure used by mollusks for feeding, sometimes compared to a tongue. It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food enters the esophagus. The radula is unique to the mollusks, and is found in every class of mollusk except the bivalves, which instead use cilia, waving filaments that bring minute organisms to the mouth.
Radula and individual tooth of the predatory ghost slug, Selenochlamys ysbryda
Microscopic detail of a docoglossan radula showing the denticles or teeth
Tracks made by terrestrial gastropods with their radulas, scraping green algae from a surface inside a greenhouse
Upper right: Mouth of a Planorbarius corneus freshwater snail with the radula visible.