Origin of euconodont elements
Abstract
Primitive euconodont elements from the Upper Cambrian of Sweden are investigated histologically and compared with co-occurring elements of paraconodonts. The proposed close relationship between the two groups is confirmed. Typical euconodont and paraconodont elements are bridged by intermediate forms. The ontogenetic development of the early euconodont elements shows striking similarities to the evolutionary development from paraconodonts to euconodonts, suggesting that evolution generally followed a peramorphic pattern (“recapitulation”). The conodont crown originated through extension of the growth lamellae around the whole element, accompanied by stronger mineralization. The first denticulation inProconodontusarose when a jagged posterior edge in juvenile specimens was enhanced by the subsequent deposition of growth lamellae, a process comparable to the regeneration of broken tips. The most primitive euconodont elements probably erupted from the epithelium earlier in ontogeny than in more advanced forms. After the appearance of the phosphatic crown, conodont elements underwent a very rapid morphological differentiation.Cordylodusmay have arisen fromProconodontus serratus.
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- Authors
- Szaniawski, H., & Bengtson, S.
- Affiliations
- Institute of Paleobiology (PL)
- Uppsala University (SE)
- ORCID
- Bengtson, Stefan
- Venue
- Journal of Paleontology
- Publisher
- Cambridge University Press (CUP)
- Published
- 1993-07
- Volume
- 67
- Issue
- 4
- Pages
- 640-654
- ISSN
- 0022-3360 (ISSN-L)
- 1937-2337
- OpenAlex
- W2340990971
- Cited by
- 45
- References
- 35
- Citations by year
- 2022: 1 · 2019: 1 · 2017: 1 · 2015: 1 · 2014: 3 · 2013: 2
- FWCI
- 3.52
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Paleontology (publishedVersion)
- 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
- conodont evolution, Cordylodus, ontogeny, recapitulation, peramorphosis, mineralization, histology, Upper Cambrian
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