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Hi all, Another very specific bivalve question for you all, this time regarding the freshwater species Corbicula fluminalis. So on the Wikipedia page: LINK, it says that this species is originally from Asia, but was introduced to Europe (and USA). Meaning it was brought here by humans. But, what is weird is that I found 2 fossil specimens of this species (as well as modern ones sometimes) here in the Netherlands! From the late Pleistocene, some 400K years ago. Long before humans had the means to introduce bivalve species like this in new places (and also long before humans came to the Netherlands in the first place). Oh, also, something relevant to take into account is that this species is NOT present in Eemian sediments! (late Pleistocene, 120k years) So how come that this species was "there" 400K years ago, disappeared, and then "came back"? The only thing I would consider as a solution is that the species went locally extinct (while still thriving in Eastern Asia) and was then reintroduced, but what is surprising is that I don't think that one single species could be alive in several different places far away from each other (the distance from Amsterdam to Beijing is nearly 8000 km!)... I don't think a bivalve species could possibly be present in such faraway places. So my question to you all is: what happened? How could it be on/off/on for this species in the Netherlands? Thanks in advance! Max