No idea on the seashell:(

[Alumette]

Hi Alumette,
it's family Ellobiidae, genus Pythia. As far as I know, three species are known from Bali and the surrouding islands: Pythia imperforata, Pythia pantherina and Pythia undata. Should be one of these species. For closer determination it's necessary to judge the lamellae and dentes in the aperture. A little bit difficult here because of the grains of sand...... :-\
Kind regards: wolf

wolfi, dear, thank you very much for such a detailed reply! I tried to learn the subject accordind to your leads. To my regret I have only net-sources within reach. So... I`ve seen only few pictures of P. imperforata, no one - of P.undata (evidemment tres tres rare form, non?) Instead - a lot of pictures of P.pantheria!!!!!! May it be that the colour is one of the important characteristics on the way of determination? Therefore it could happen that the mine is a "panther"
Sometimes I don`t separate my shells from the sand because the grains of sand on different beaches are different as well. Like in this case: the sand grains on the beach of Nusa Dua(I don`t know the name of the beach in English) are nearly perfectly ball-shaped!!! It reminds me of the place where I`ve found a particular shell without a special sticker....Maybe It`s a wrong way.. I don`t know...
wolfi, thank you very much for the participation!