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Article: Patterns of intraspecific variation through ontogeny: a case study of the Cretaceous nautilid Eutrephoceras dekayi and modern Nautilus pompilius

Palaeontology - Vol. 63 Part 5 - Cover Image
Publication: Palaeontology
Volume: 63
Part: 5
Publication Date: September 2020
Page(s): 807 820
Author(s): Amane Tajika, Neil H. Landman, Naoki Morimoto, Kenji Ikuno, and Tom Linn
Addition Information

How to Cite

TAJIKA, A., LANDMAN, N.H., MORIMOTO, N., IKUNO, K., LINN, T. 2020. . Palaeontology, 63, 5, 807-820. DOI: /doi/10.1111/pala.12490

Author Information

  • Amane Tajika - Division of Paleontology (Invertebrates) American Museum of Natural History Central Park West 79th Street New York NY 10024 USA
  • Neil H. Landman - Division of Paleontology (Invertebrates) American Museum of Natural History Central Park West 79th Street New York NY 10024 USA
  • Naoki Morimoto - Laboratory of Physical Anthropology Graduate School of Science Kyoto University Kitashirakawa Oiwake???cho, Sakyo???ku 606???8502 Kyoto Japan
  • Kenji Ikuno - Division of Natural History Museum of Nature & Human Activities Hyogo, Sanda 669???1546 Hyogo Japan
  • Kenji Ikuno - Division of Earth Sciences Institute of Natural & Environmental Sciences University of Hyogo Sanda 669???1546 Hyogo Japan
  • Tom Linn - Glendive MT USA

Publication History

  • Issue published online: 30 August 2020
  • Manuscript Accepted: 02 April 2020
  • Manuscript Received: 20 December 2019

Funded By

Japan Society for the Promotion of Science
Fukada Geological Institute

Online Version Hosted By

Wiley Online Library
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Abstract

The magnitude and ontogenetic patterns of intraspecific variation can provide important insights into the evolution and development of organisms. Understanding the intraspecific variation of organisms is also a key to correctly pursuing studies in major fields of palaeontology. However, intraspecific variation has been largely overlooked in ectocochleate cephalopods, particularly nautilids. Furthermore, little is known regarding the evolutionary pattern. Here, we present morphological data for the Cretaceous nautilid Eutrephoceras dekayi (Morton) and the modern nautilid Nautilus pompilius Linnaeus through ontogeny. The data are used to describe conch morphology and to elucidate the evolutionary patterns of intraspecific variation. We discovered a similar overall pattern of growth trajectories and the presence of morphological changes at hatching and maturity in both taxa. We also found that intraspecific variation is higher in earlier ontogeny than in later ontogeny in both taxa. The high variation in earlier ontogeny may imply increased flexibility in changing the timing of developmental events, which probably played an important role in nautilid evolution. We assume that the decrease in variation in later ontogeny reflects developmental constraints. Lastly, we compared the similarity/dissimilarity of ontogenetic patterns of variation between taxa. Results reveal that the similarity/dissimilarity of the ontogenetic pattern differs between E.??dekayi and N.??pompilius. We conclude that this shift in the ontogenetic pattern of variation may be rooted in changes in the developmental programme of nautilids through time. We propose that studying ontogenetic patterns of intraspecific variation can provide new insights into the evolution and development of organisms.

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