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Can someone help me see if it is an aptychus in the stone or something else? Many thanks. I actually have no idea how to recognize. Any tips are appreciated!

Hi Everyone! A couple of days ago I returned from a fieldtrip to the Solnhofen region in Germany. The trip was organized by my fossilclub the BVP as well as my friend and professional paleontologist Jonathan Wallaard who led the trip. During our 4 day stay we visited 3 different quarries and the Burgermeister-Müller-Museum in Solnhofen. The Solnhofen Limestone is probably one of the most famous Konservat-Lagerstätte in the World. Dating back to the late Jurassic, Tithonian around 152 - 150 million years ago. During this time this area was a tropical archipelago in the Tethys Sea with many small islands and shallow lagoons. Due to its exceptional preservation we have an extensive record of the marine fauna as well a some knowledge of terrestrial species which inhabited the islands (which should have been located around 30 km from the mainland if I heard correctly from one of the quarry owners.) These seas were home to multiple species of ammonites, belemnites and squids; crinoïds like the free-floating Saccocoma; Echinoïds and Starfish; Horseshoe crabs, lobsters, crabs and schrimps; as well as sponges, corals, jellyfish, bivalves, gastropods and brachiopods (which are relatively rare finds.) But also a large diversity of bony fish (some of which could reach multiple meters in length), Hybodont sharks, Chimaera's as well as marine reptiles like the Ichthyosaur "Aegirosaurus", marine crocodiles, turtles and Pleurosaurus. The islands were home to Cycads and Araucariaceae trees, but also by many insects like dragonflies and beetles, reptiles like Sphenodonts and Squamates. Though the most famous of its inhabitants must have been the pterosaurs like Pterodactylus and Rhamphorhynchus as well as some dinosaurs like Compsognathus, Juravenator, Sciurumimus, Archaeopteryx and Alcmonavis. Our first day of digging was on friday (may 19th) at the BGM hobbysteinbruch in Solnhofen which is part of the Mörnsheim Formation (150,8 - 150 mya). https://www.solnhofen-fossilienatlas.de/siteinfo.php?section=sites&siteid=75&sitename=Solnhofen Hobbybruch The main fossils that could be found in this quarry were ammonites, aptychi, coprolites as well as fish. Our group of around 30 people assembled at the quarry at 10 o'clock and after a few words from the quarry owner and Jonathan we set of to dig. An overview of the quarry before we started digging. A couple of minutes later... Jonathan pointed me and my good friend Tom to a good place to dig and so we started cleaning debri so we could start digging. Since the Plattenkalk is layered it is always a good stategy to find some plateaus where so can hack away chunks which you can later split (which I suppose most of you already know). Pic of my hole in which I was working Unfortunately it turns out that the spot I picked must have been a public toilet as pretty much everything I found the first half of the day where coprolites, which turned into a running joke that day I was lucky enough to find a fish early one, though still entirely entombed in the rock but Jonathan warned us to look for bones into the cracked stones and that's how I managed to find it. Will require quite some prep work though. Later that day I started finding multiple Aptychi, Ammonites as well as a rare Bivalve. A plate with 3 ammonites (probably Neochetoceras steraspis) An ammonite with the Aptychus still in place which was found by one of the other members. Our club founder Luc, found this large piece of decorative slab which almost looked like it is petrified wooden dining table. Not a fossil but still cool as heck. And Tinneke managed to find a lovely fish jaw which was excavated by the help of Jonathan. While I didn't take pictures of the following, quite some members found fossil fish (some around 40 cm in lenght) and crustaceans like schrimp.

This could be my fossil of the day… but I would like to get your expert opinion please.