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Cited by 59Evolution and Paleontology StudiesPaleontology and Stratigraphy of FossilsPaleontology and Evolutionary Biology

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Adaptive evolution in Paleozoic coiled cephalopods

Kröger, Björn·2005·Paleobiology
DOI 10.1666/0094-8373(2005)031[0253:aeipcc]2.0.co;2
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Abstract

Coiled cephalopods constitute a major part of the Paleozoic nekton. They emerged in the Early Ordovician but nearly vanished in the Silurian. The Emsian appearance of ammonoids started a story of evolutionary success of coiled cephalopods, which lasted until the end-Permian extinction event. This story is investigated by using a taxonomic database of 1346 species of 253 genera of coiled nautiloids and 1114 genera of ammonoids. The per capita sampling diversities, the Van Valen metrics of origination and extinction, and the probabilities of origination and extinction were calculated at stage intervals. The outcome of these estimations largely reflects the known biotic events of the Paleozoic. The polyphyletic, iterative appearance of coiled cephalopods within this time frame is interpreted to be a process of adaptation to shell-crushing predatory pressure. The evolution of the diversity of coiled nautiloids and ammonoids is strongly correlated within the time intervals. Once established, assemblages of coiled cephalopods are related to changes in sea level. The general trends of decreasing mean (or background) origination and extinction rates during the Paleozoic are interpreted to reflect a successive stabilization of the coiled cephalopod assemblages. Different reproduction strategies in ammonoids and nautiloids apparently resulted in different modes of competition and morphological trends. Significant morphological trends toward a stronger ornamentation and a centrally posi…

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Metadata

Authors
Kröger, B.
Affiliations
Museum für Naturkunde (DE)
Corresponding author
Kröger, Björn
ORCID
Kröger, Björn
Venue
Paleobiology
Publisher
Cambridge University Press (CUP)
Published
2005-06
Volume
31
Issue
2
Pages
253-268
ISSN
  • 0094-8373 (ISSN-L)
  • 1938-5331
DOI
10.1666/0094-8373(2005)031[0253:aeipcc]2.0.co;2
OpenAlex
W2172539587
Cited by
59
References
2
Citations by year
2026: 2 · 2025: 2 · 2023: 2 · 2022: 4 · 2021: 5 · 2020: 1 · 2019: 8 · 2018: 1 · 2017: 2 · 2016: 1 · 2015: 8 · 2014: 2 · 2012: 4
FWCI
1.42
Type
journal article
Language
en
Open access
closed
Locations
  • Paleobiology (publishedVersion)
  • BioOne Complete (BioOne) (submittedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
Keywords
coiled cephalopods, Paleozoic, ammonoids, nautiloids, adaptive evolution, origination and extinction rates, sea-level change, siphuncle, shell ornamentation, reproductive strategies

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