Why Ammonoids Went Extinct at the End Cretaceous While Nautiloids Survived? GEO GIRL
Ammonites are beautiful & diverse fossilized mollusks! Unfortunately, the animal that created these remarkable fossils, ammonoids, went extinct along side the dinosaurs around 66 million years ago. Oddly, nautiloids, a very similar group of cephalopods, survived this extinction event and still exist today. The survival of nautiloids & extinction of ammonoids has puzzled many scientists given that, during their existence, ammonoids were much more diverse than nautiloids. Diversity normally makes animals more resilient during extinction events, but it did not save the ammonoids. Today, ammonite fossils are all we have left of these beautiful creatures, and in this video, I address the top 5 reasons ammonoids went extinct while nautiloids survived the KPg extinction event.
References:
Alvarez et al., 1980 (Extraterrestrial cause for the Cretaceous-Tertiary extinction): https://doi.org/10.1126/science.208.4...
Klug et al., 2015 (Ammonoid paleobiology): https://doi.org/10.1007/978-94-017-96...
Huber et al., 2002 (Extreme warmth during Cretaceous): https://doi.org/10.1130/0091-7613(200...
Ward & Kirschvink, 2015 (A new history of life: The radical new discoveries about the origins and evolution of life on earth): https://amzn.to/43F5VyD
Tajika et al., 2023 (Ammonoid extinction versus nautiloid survival: Is metabolism responsible?): http://dx.doi.org/10.1130/G51116.1
https://en.wikipedia.org/wiki/Ammonoidea
https://www.nhm.ac.uk/discover/what-i...
https://en.wikipedia.org/wiki/Evoluti...
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0:00 Extinction Selectivity
0:46 K-Pg Extinction
1:18 What are Ammonoids & Nautiloids?
2:36 Ammonoid & Nautiloid Differences
4:40 Where/When Ammonoids & Nautiloids Lived
6:25 5 Reasons Ammonoids Went Extinct
8:37 Why Nautiloids Survived
9:17 Did Some Ammonoids Survive the KPg?
10:16 Were Ammonoids Inferior to Nautiloids?
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