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Showing results for tags 'not ceratites'.
The other day I bought a set of ammonites from a dealer who was selling off specimens from an old collection. Two of the ammonites were labeled, probably correctly, as the Triassic species Ceratites nodosus and Acanthoceratites spinosus. A third specimen was also labeled as a ceratitid, but it is clearly different. For example the suture line is not at all ceratites-like, and is definitely an ammonite. To my eye several features suggest Placenticeras, a late Cretaceous genus. These include a flat venter with alternating clavi (elongated nodes), nodes at about mid flank, possible faint umbilical nodes, and a very complex suture line. If it is a Placenticeras it doesn't exactly match the species I am familiar with, and the preservation is also unfamilar. Note that there is a lot I don't know about the genus. However it occurs to me that various species of Placenticeras are found in Europe. Of course, it also could be something else entirely. I am asking the community, and especially my fellow ammonite aficionados ( @rocket @Ludwigia @PFOOLEY et al) if they recognize the species and/or the mode of preservation. General aspect: Flank with nodes: Venter showing flat edge with clavi (elongated nodes) on either side: Suture line: I forgot to get a photo of the profile with the aperture, I will add that this evening when I get home. Don