Biol Rev Camb Philos Soc April 2021 PMID 33438316

Recent advances in heteromorph ammonoid palaeobiology.

René Hoffmann, Joshua S Slattery, Isabelle Kruta, Benjamin J Linzmeier, Robert E Lemanis, Aleksandr Mironenko, Stijn Goolaerts, Kenneth De Baets, David J Peterman, Christian Klug

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Abstract in brief

Heteromorph ammonoids are a unique group characterized by their irregular shell shapes, such as detached whorls and open or nonplanispiral coiling, which evolved convergently four times within the group, and recent research has significantly advanced understanding of their anatomy, ecology, and extinction.
Their anatomy included features like 10 arms, well-developed eyes, and a radula, with evidence suggesting they had a zooplanktic diet composed mainly of small crustaceans, gastropods, and crinoids, and their shell shapes influenced their feeding and buoyancy strategies.
Heteromorphs could achieve near-neutral buoyancy regardless of shell shape, with different forms adapted to specific orientations and feeding strategies, but they had limited ability to actively change their orientation, especially those with Ushaped shells, impacting their mobility and prey access.

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Recent advances in heteromorph ammonoid palaeobiology - Hoffmann - - Biological Reviews - Wiley Online Library https://t.co/doSnRa4Pgb

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Recent advances in heteromorph ammonoid palaeobiology.

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Abstract in brief

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All mentions

Evaluating the Accuracy of 2007 Prehistoric Sea Monster Documentary

Genetic Origins of African Haplotypes and Evolution of Heteromorph Ammonoids