These small gastropods are really difficult to identify. Can anyone let me know which species they are belong to? These samples are from Penang, Malaysia.
I would recommend to use keys (for example, Benthem Jutting's ones) instead of posting photographs, without any locality data. Aquatic mollusks are highly variable in conchyliological characters and any identifications made on base of these photographs will be true to generic level only. Especially, considering there are so many sister species only possible to recognize using DNA