My apologies for reviving this long-dead thread, but recently an interesting paper was published on the earliest record of exophytic oviposition (as opposed to endophytic) from the Gzhelian of Germany by Laass and Hauschke (2019). Beautiful trace fossils and ditto interpretation. The paper also provides a rather nice overview of the Palaeozoic fossil record of oviposition scars, including a reference to the Piesberg-specimen discussed in this thread, which is now officially listed as the oldest
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