Talk:List of ammonite genera

Naming conventions and terminology

Couldn't the rather lengthy discussion on naming conventions and terminology be left to a relevant page on taxonomy rather than taking up unnecessary space here. It seems that very brief statements regarding included concerns would suffice.

I'll be working up a simplifation in the next week or so, pending comment, either here or on my talk page user talk:J.H.McDonnell

Regards, John J.H.McDonnell 3/3/09 —Preceding unsigned comment added by J.H.McDonnell (talk • contribs) 13:47, 3 March 2009 (UTC)

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Left handed chirality shells in lead image

I've noticed in the lead image that a lot of the shells are drawn with a left hand handed chirality. Apparently for the sake of making the image symmetrical.

As I understand it, left handed chirality in shelled animals, or in natural spiral structures in general is rather rare. So, it stands to reason that unless this was drawn from museum samples, where they would conceivably have a large collection with a lot of variation.

Alternatively, I realize that ammonite fossils are very common. So, it stands to reason the picture was drawn from their own samples.

I'm not necessarily saying the picture is inaccurate. Cephalopods can certainly have left handed shells. Though I can't speak specifically for ammonites, I don't see why they would be an exception.

I've just been studying chirality in nature, and the odd fact that most spiral structures are right handed. Even manmade ones, for some reason we favour right handed spirals. But I loved the idea, because you only ever hear of chirality in the context of chemistry. But once you learn it applies to all spirals, you see it everywhere. I always have to check the handedness of every spiral I see now that I know. 2607:FEA8:99E0:61D0:9502:D3E3:318B:AD47 (talk) 22:20, 28 November 2023 (UTC)