The Biggest Ammonite Fossil Ever Found Was A Whopping 1.8 Meters
That means the largest ammonites were similar in size to giant sunfish when they were alive
Rachael Funnell, IFL Science, June 9, 2023
[www.iflscience.com]

Parapuzosia seppenradensis - Wikipedia
[en.wikipedia.org]

A related article is:

Tohoku University Exhibits Rare Giant Ammonite Fossil
By Iednewsdesk On Aug 29, 2023
[indiaeducationdiary.in]

Yours,

Paul H.

"The past is never dead. It's not even past."
William Faulkner, Act 1, Scene III, Requiem for a Nun (1951)