Lymnaea stagnalis

Fascinating facts about the Lymnaea stagnalis

• Great pond snails can grow a shell as tall as a school ruler, reaching 45 to 60 mm in height and occasionally stretching to 70 mm, while the width spans 20 to 30 mm. Their coiled homes sport 4.5 to 6 weakly convex whorls, with the upper whorls pointed and the final whorl suddenly inflated. These dimensions make them easy to spot among pond vegetation and set them apart from the much smaller Radix peregra, whose shells only reach 12 to 20 mm.
• A single great pond snail houses about 20,000 neurons, each up to roughly 100 µm across, forming a ring of interconnected ganglia that scientists can probe individually. This unusually large, identifiable neuronal roster lets researchers watch how simple circuits drive feeding, breathing, locomotion and reproduction in real time. Because each cell can be isolated, the snail has become a premier model for uncovering how memories form, how nerves regenerate after injury, and how organisms adapt to low-oxygen stress.
• The great pond snail lives across the holarctic, from temperate North America to Europe and Asia, thriving in ponds, lakes and sluggish rivers rich in underwater plants. Its northernmost outposts sit in northern Norway, and it even colonises mountain streams at 1,700 m above sea level in Central Europe. In Germany's Saprobiensystem water-quality index, the snail scores 1.9, signalling a biotope of class II, the second-highest rating.
• Great pond snails are simultaneous hermaphrodites, capable of acting as male or female but only one role per copulation. When placed in larger groups they perform more inseminations, and they show a clear preference for novel partners over familiar ones, a behavior known as the Coolidge effect, first demonstrated in hermaphrodites in 2007.
• In the wild, great pond snails act as intermediate hosts for a suite of parasites, as well as the bird parasite Elaphostrongylus rangiferi in experimental infections.

Sources

Every fact above was checked against these pages, and kept only where one of them states it.

• Wikipedia

At a glance

About the Lymnaea stagnalis

In the tranquil depths of freshwater ponds and lakes, the Lymnaea stagnalis, a species of air-breathing snail, glides effortlessly across the soft sediment, its slender foot leaving behind a trail of silvery slime as it searches for tender aquatic plants to graze upon. With its translucent shell glistening in the sunlight, this unassuming creature moves through the world with a quiet determination, its very existence a testament to the remarkable adaptability of life in even the most serene of environments. As it rises to the water's surface to breathe, the Lymnaea stagnalis embodies a peaceful, almost meditative quality, its gentle nature a soothing balm for the natural world.

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