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)

External links modified
Hello fellow Wikipedians,

I have just modified 2 external links on List of ammonite genera. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
 * Added archive https://web.archive.org/web/20080507014300/http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=231&rank=class to http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=231&rank=class
 * Added archive https://web.archive.org/web/20080507014300/http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=231&rank=class to http://strata.ummp.lsa.umich.edu/jack/showgenera.php?taxon=231&rank=class

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

Cheers.— InternetArchiveBot  (Report bug) 07:28, 20 May 2017 (UTC)

External links modified
Hello fellow Wikipedians,

I have just modified one external link on List of ammonite genera. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
 * Added archive https://web.archive.org/web/20070927185417/http://palaeontology.palass-pubs.org/pdf/Vol%2041/Pages%20993-999.pdf to http://palaeontology.palass-pubs.org/pdf/Vol%2041/Pages%20993-999.pdf

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

Cheers.— InternetArchiveBot  (Report bug) 13:11, 28 December 2017 (UTC)

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)