The shells have been found in the foundation of a building in Germany and I am interested to find out if they have a marine or freshwater origin. The shells are between 0.5 and 2.0 cm large.
Hi Florian,
definitly freshwater gastropods (Planorbidae and Lymnaeidae).
Best regards
Johannes
Both freshwater: Lymnaeidae (probably Lymnaea stagnalis) and Planorbidae (probaly Planorbis planorbis)
Thank you very much for your helpful answers. It was also my suggestion that they are from freshwater but with your confirmation I am now sure.
absolutely freshwater, no doubt. I'd say could be Stagnicola palustris (Lymnaeidae) and Planorbis
All freshwater snails, Lymnaea or Stagnicola, and the rest round is not Planorbis if they are small, but if around 0,5 cm as U wrote: Anisus
The flat shels are Planorbis planorbis from Planorbidae, other - seemed like Lymnaea corvus
I'd say at least two species of Planorbidae both belonging to genus Gyraulus and maybe a third specimens of Planorbidae belonging to genus Planorbis. What's left belongs to Lymnaeidae (Lymnaea?) but it's hard to identify a species. Also in this group genital anatomy revealed to be essential.
The high-spired shell is Stagnicola sp. (family Lymnaeidae), , and the larger planispiral ones are Planorbis planorbis (Linnaeus 1758). the single small planispiral shell may be a Gyraulus or a juvenile Planorbis planorbis. Clearly a freshwater association from a shallow, standing or slow moving water body.
With a higher aperture, I would say the turreted ones are close to Stagnicola fuscus and withot distinct keel on the periphery the planispiral shells are Planorbis planorbis. In accordance with the comments above, the environment appears to be a shallow eutrophic habitat with rich macrophytic vegetation.
My opinion: Lymnaea stagnalis, Stagnicola sp. (maybe fuscus?) and Planorbis planorbis. Of course all are freshwater snails. No other species as the small one is juv. Planorbis planorbis.
Stagnicola corvus + Planorbis planorbis. Incorrect position of shells for fotography. Do it like in identification keys. Shells are subfossil and looks unusual for examples collected in recent conditions. In some cases I found in Kaliningrad region (Russia) unusual morfs for Lymnaea stagnalis in subfossil conditions, this example looks the in same situation. Clear identification for Stagnicola species is possible with use only mophology of copulative and breeding system of snails. Fossil records not give us this possibility, but Planorbis planorbis does not have a typical keel in this case, it rare situation, but the possible situation for this specimen.
Sorry for my not good English language=)
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