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Orthoconic cephalopods and associated fauna from the late Ordovician Soom Shale Lagersta¨tte, South Africa
Abstract
ABSTRACT. Orthoconic cephalopods from the Soom Shale Member (Ashgill) are exceptionally preserved and are colonized by lingulate brachiopods and cornulitids. Other fossils commonly associated with orthocones include myodocopid ostracodes and chitinozoans. Size distribution analysis of the brachiopods on one orthocone indicates that it was colonized in vivo. Four orthocone radulae are preserved extending the record of these structures 50 My back to the late Ordovician. Orthocone radula configuration is more similar to that of ammonoids and coleoids than to that of nautiloids.
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Cephalopod radulae are known from the Late Ordovician Soom Shale Lagerstätte (South Africa) and the Silurian Kirusillas Shale (Bolivia).
“But why are cephalopod jaws absent from strata older than the Late Devonian? Answering this question becomes even more difficult in light of the fact that cephalopod radulae are known from the Late Ordovician Soom Shale Lagerstätte (South Africa; Gabbott 1999) and the Silurian Kirusillas Shale (Bolivia; Mehl 1984).”
From Palaeozoic evolution of animal mouthparts (2017) · cites this paper as Gabbott 1999
Slightly elevated structures in the Ordovician orthocones might be homologous to jaws of later cephalopods.
“Slightly elevated structures in the Ordovician orthocones published by Gabbott (1999) might be homologous to jaws of later cephalopods; at least superficially, these structures are reminiscent of the narrow 'jaws' of gastropods.”
From Palaeozoic evolution of animal mouthparts (2017) · cites this paper as Gabbott 1999
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Hooking some stem‐group “worms”: fossil lophotrochozoans in the Burgess Shale
Butterfield, N. J. (2006) · BioEssays · doi:10.1002/bies.20507 · Cited by 84
Palaeozoic evolution of animal mouthparts
Klug, C., Frey, L., Pohle, A., De Baets, K., & Korn, D. (2017) · Bulletin of Geosciences · doi:10.3140/bull.geosci.1648 · Cited by 54
Gabbott, S. E., Norry, M. J., Aldridge, R. J., & Theron, J. N. (2001) · Proceedings of the Yorkshire Geological Society · doi:10.1144/pygs.53.3.237 · Cited by 53
Self-citation
Metadata
- Authors
- Gabbott, S. E.
- Affiliations
- University of Leicester (GB)
- Corresponding author
- Gabbott, Sarah E.
- ORCID
- Gabbott, Sarah E.
- Venue
- Palaeontology
- Publisher
- Wiley
- Published
- 1999-02
- Volume
- 42
- Issue
- 1
- Pages
- 123-148
- ISSN
- 0031-0239 (ISSN-L)
- 1475-4983
- OpenAlex
- W2090238348
- Cited by
- 61
- References
- 0
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 1 · 2023: 4 · 2021: 4 · 2020: 3 · 2019: 4 · 2018: 2 · 2017: 3 · 2016: 3 · 2015: 2 · 2014: 1 · 2013: 1 · 2012: 3
- FWCI
- 1.24
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Palaeontology (publishedVersion)
- Leicester Research Archive (University of Leicester) (submittedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
- Keywords
- orthoconic cephalopods, Ashgill, Late Ordovician, exceptional preservation, chitinozoans, cephalopod evolution
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