Does intraspecific variation in juvenile Late Cretaceous ammonoids correlate with their systematic position, longevity and paleogeography?

Amane Tajika, Takahiro Iida, Ryoji Wani, Neil H Landman, Kenji Ikuno, Christian Klug

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Article in Swiss journal of palaeontology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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1 · What the graph read from it

What it found

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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

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5 · Who and what money

Authors and funding

6 authors.

Amane TajikaHakubi Center for Advanced Research, Kyoto University, Yoshida-Honmachi, Sakyo-Ku, Kyoto, 606-8501 Japan.

Takahiro IidaGraduate School of Environment and Information Sciences, Yokohama National University, Yokohama, 240‑8501 Japan.

Ryoji WaniFaculty of Environment and Information Sciences, Yokohama National University, Yokohama, 240‑8501 Japan.

Neil H LandmanDivision of Paleontology (Invertebrates), American Museum of Natural History, Central Park West 79th Street, New York, NY 10024 USA.

Kenji IkunoDivision of Natural History, Museum of Nature and Human Activities, Sanda, Hyogo 669-1546 Japan.

Christian KlugPaläontologisches Institut, Universität Zürich, Karl-Schmid-Strasse 4, 8006 Zurich, Switzerland.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Phenotypic intraspecific variation of organisms is essential for evolution and, thus, has the potential to provide crucial insights into evolutionary dynamics. Additionally, ontogeny is often intricately linked with the evolutionary trajectories of organisms. In this study, we explore the relationship between the magnitude and ontogenetic pattern of intraspecific variation, and the interrelationships of organisms, their geographic distribution, and species duration. We analyzed the intraspecific variation in the whorl expansion rate (WER) of several Late Cretaceous ammonoid species, including Supplementary Information: The online version contains supplementary material available at 10.1186/s13358-025-00397-y.

Identifiers

PMID40843208

DOI10.1186/s13358-025-00397-y

PMCPMC12364979

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.