This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Ammonite with aptychi retracting. en tentative reconstruction of soft part anatomy of an ammonite and conceptual scheme of the aptychi function as both opercula and lower jaw After Lehmann and Dzik Text in italian Own Antonov Ammonoidea morphology
Page 2023 Free-images.com. All images are Public Domain