The aptychus has variously been proposed to be part of an operculum, the jaws, a filter-feeding device, part of the propulsion system, and even male ammonites. https://t.co/qzyJeUeRRp
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One of the things I most enjoyed about my (very) brief adventures in paleobio was discovering that the whole field is just people arguing over whose story about old fragments/impressions is most convincing. Reading paleobio papers was actually fun.
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RT @TanisBP: There is a lot of debate if Ammonites were able to shut themselves inside their shells for protection using a structure called…
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There is a lot of debate if Ammonites were able to shut themselves inside their shells for protection using a structure called an aptychus (Parent & Westerman 2015) https://t.co/dnXZ3jKNuy #2021MMM