Ram's Horn Snail Shell (Planorbid Snail)
Phylum: Mollusca, Class: Gastropoda, Order: Hygrophila, Family: Planorbidae, Genus: Planorbis, Species: Planorbis corneus · Planorbidae (Planorbid or Ram's Horn snail family) · Gastropod, whole shell, planispiral shape
Species
Planorbis corneus
Shell Type
Gastropod, whole shell, planispiral shape
Family
Planorbidae (Planorbid or Ram's Horn snail family)
Size
Approximately 1 to 1.5 inches in diameter, which is typical for a mature specimen of this freshwater species.
Color & Pattern
Rich reddish-brown to horn-brown base color with subtle growth lines and darker radial streaks radiating outward from the central spire.
Rarity
Common in appropriate freshwater habitats and aquarium trade.
Habitat
Shallow freshwater environments such as ponds, slow-moving rivers, marshes, and heavily vegetated lakes.
Geographic Range
Widespread across Europe and parts of northern Asia.
Description
A striking planispiral freshwater gastropod shell, tightly coiled in a single flat plane resembling the curved horns of a ram. The surface features fine growth lines and a glossy, warm brownish finish with delicate darker patterning along the whorls.
Key Features
Planispiral coiling where all whorls lie in the same flat plane, making both sides look nearly identical; lack of a prominent spire; dextral or sinistral flat coil structure.
Collector Value
Low to moderate commercial value; commonly collected by amateur naturalists and aquarium enthusiasts rather than specialized marine shell collectors.
Condition Notes
Intact whole shell in good condition with natural coloration preserved, exhibiting normal luster for a freshwater gastropod.
Interesting Facts
Unlike many snails, Planorbidae use hemoglobin instead of hemocyanin to transport oxygen in their blood, giving their bodily fluids a red color. They are also popular in the freshwater aquarium trade for algae control.
Ecological Role
Acts as an important consumer and detritivore in freshwater ecosystems, feeding on algae, detritus, and decaying plant matter while serving as a food source for fish and waterfowl.
Similar Species
Marisa cornuarietis (Giant Ram's Horn Snail) and other Planorbis species, distinguished primarily by size, exact whorl count, and geographical distribution.
Beach Finding Tips
Found along the muddy banks and shallow shores of freshwater ponds, lakes, and slow-moving streams, often among decaying aquatic vegetation.
Notes
Safari