Hi Ramzi. Identifying freshwater snails can be difficult without location, and other characteristics that are not easily observable from a photo. These characteristics will include whether it has an operculum, and soft tissue features. Looking at the shell shapes here indicates you may have more than 1 species. There is a great online identification key for freshwater snails in Australia here: https://keys.lucidcentral.org/keys/v3/freshwater_molluscs/. The characteristics here may give you an idea of the groups these may be in.
Good luck. Pete
Thank you very much Peter for your answer and especially for the website key. The snails come from an oasis in the southwest of Tunisia (the region called Tamerza). Yesterday I collected two other species of which I will send you photos as soon as possible.
Please, Dr. Peter, review these photos (attached) and tell me your thoughts.
Hi Ramzi, I am not an expert in snails. My best guess at these are they are different species possibly from the family of Lymnaeidae. Without seeing them in person and having an up-to-date key this is difficult. This is a link to an older key for your area which may help. https://www.eliminateschisto.org/sites/gsa/files/content/attachments/2022-08-05/fg_emro_1983.pdf
and a more recent one here.
Book The Freshwater Gastropods of the West-Palaearctis
Hope that helps. Regards
Pete
Looks like Melanoides tuberculata in my aquarium, but there are many freshwater snails similar in shell form around the world, so it's rather difficult to determine precisely by photo.
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