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Intraspecific morphological variation of Agnostus pisiformis, a Cambrian Series 3 trilobite-like arthropod

Jackson, Illiam LU and Budd, Graham (2017) In Lethaia 50(4). p.467-485
Abstract
The study of evolution in a palaeontological context is chiefly the study of change in shape and form. This requires data sets that quantify morphology and morphological variation. Historically morphology has been described using discrete characters or more recently using various morphometric approaches. Elliptical Fourier analysis (EFA) is an approach to quantifying morphology that results in the production of large data sets of elliptical Fourier descriptors (EFDs), which are highly suitable to multivariate analysis. EFA is used in this paper to quantify the shape and describe the ontogeny of Agnostus pisiformis (Wahlenberg 1818: Nova Acta Regiae Societatis Scientiarum Upsaliensis 8, 1), a trilobite-like arthropod of Cambrian Series 3,... (More)
The study of evolution in a palaeontological context is chiefly the study of change in shape and form. This requires data sets that quantify morphology and morphological variation. Historically morphology has been described using discrete characters or more recently using various morphometric approaches. Elliptical Fourier analysis (EFA) is an approach to quantifying morphology that results in the production of large data sets of elliptical Fourier descriptors (EFDs), which are highly suitable to multivariate analysis. EFA is used in this paper to quantify the shape and describe the ontogeny of Agnostus pisiformis (Wahlenberg 1818: Nova Acta Regiae Societatis Scientiarum Upsaliensis 8, 1), a trilobite-like arthropod of Cambrian Series 3, from three coeval localities in Sweden. An ontogenetic difference was detected between geographically distant populations from Västergötland and Skåne in Sweden. These differences are probably the result of environmental dysoxic stress leading to increasing phenotypic variation. These findings illustrate the utility of EFA applied to the study of fossil organisms; permitting studies of such high resolution that multiple assemblages of the same species can be comparatively studied to achieve a more detailed understanding of their morphological and ontogenetic variation. (Less)
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author
and
publishing date
type
Contribution to journal
publication status
published
subject
in
Lethaia
volume
50
issue
4
pages
467 - 485
publisher
Taylor & Francis
external identifiers
  • scopus:85017204418
ISSN
0024-1164
DOI
10.1111/let.12201
language
English
LU publication?
no
id
cd145658-c72a-4f03-aa3e-b28502a017bc
date added to LUP
2018-03-01 13:49:13
date last changed
2020-10-07 05:45:26
@article{cd145658-c72a-4f03-aa3e-b28502a017bc,
  abstract     = {The study of evolution in a palaeontological context is chiefly the study of change in shape and form. This requires data sets that quantify morphology and morphological variation. Historically morphology has been described using discrete characters or more recently using various morphometric approaches. Elliptical Fourier analysis (EFA) is an approach to quantifying morphology that results in the production of large data sets of elliptical Fourier descriptors (EFDs), which are highly suitable to multivariate analysis. EFA is used in this paper to quantify the shape and describe the ontogeny of Agnostus pisiformis (Wahlenberg 1818: Nova Acta Regiae Societatis Scientiarum Upsaliensis 8, 1), a trilobite-like arthropod of Cambrian Series 3, from three coeval localities in Sweden. An ontogenetic difference was detected between geographically distant populations from Västergötland and Skåne in Sweden. These differences are probably the result of environmental dysoxic stress leading to increasing phenotypic variation. These findings illustrate the utility of EFA applied to the study of fossil organisms; permitting studies of such high resolution that multiple assemblages of the same species can be comparatively studied to achieve a more detailed understanding of their morphological and ontogenetic variation.},
  author       = {Jackson, Illiam and Budd, Graham},
  issn         = {0024-1164},
  language     = {eng},
  month        = {03},
  number       = {4},
  pages        = {467--485},
  publisher    = {Taylor & Francis},
  series       = {Lethaia},
  title        = {Intraspecific morphological variation of Agnostus pisiformis, a Cambrian Series 3 trilobite-like arthropod},
  url          = {http://dx.doi.org/10.1111/let.12201},
  doi          = {10.1111/let.12201},
  volume       = {50},
  year         = {2017},
}