@ARTICLE{TreeBASE2Ref21335,
author = {Jo M Wolfe and Thomas A Hegna},
title = {Testing the phylogenetic position of Cambrian pancrustacean larval fossils by coding ontogenetic stages},
year = {2013},
keywords = {Cambrian, Crustacea, Fossils, Larvae, Ontogeny, Orsten, Pancrustacea, Semaphoront},
doi = {},
url = {http://},
pmid = {},
journal = {Cladistics},
volume = {},
number = {},
pages = {},
abstract = {The study of ontogeny as an integral part of understanding the pattern of evolution dates back over 200 years, but only recently have ontogenetic data been explicitly incorporated into phylogenetic analyses. Pancrustaceans undergo radical ontogenetic changes. The spectacular upper Cambrian ?Orsten? fauna preserves phosphatized fossil larvae, including putative crown-group pancrustaceans with amazingly complete developmental sequences. The putative presence and nature of adult stages remains a source of debate, causing spurious placements in a traditional morphological analysis. We introduce a new coding method where each semaphoront (discrete larval or adult stage) is considered an operational taxonomic unit. This avoids a priori assumptions of heterochrony. Characters and their states are defined to identify changes in morphology throughout ontogeny. Phylogenetic analyses of semaphoronts produced possible relationships of each Orsten fossil to the crown-group clade expected from morphology shared with extant larvae. Bredocaris is a member of the stem lineage of Thecostraca or (Thecostraca + Copepoda), and Yicaris and Rehbachiella are probably members of the stem lineage of Cephalocarida. These placements rely directly on comparisons between extant and fossil larval character states. The position of Phosphatocopina remains unresolved. This method may have broader applications to other phylogenetic problems which may rely on ontogenetically variable homology statements.}
}
Citation for Study 13368
Citation title:
"Testing the phylogenetic position of Cambrian pancrustacean larval fossils by coding ontogenetic stages".
Study name:
"Testing the phylogenetic position of Cambrian pancrustacean larval fossils by coding ontogenetic stages".
This study is part of submission 13368
(Status: Published).
Citation
Wolfe J.M., & Hegna T.A. 2013. Testing the phylogenetic position of Cambrian pancrustacean larval fossils by coding ontogenetic stages. Cladistics, .
Authors
-
Wolfe J.M.
(submitter)
203-824-6193
-
Hegna T.A.
Abstract
The study of ontogeny as an integral part of understanding the pattern of evolution dates back over 200 years, but only recently have ontogenetic data been explicitly incorporated into phylogenetic analyses. Pancrustaceans undergo radical ontogenetic changes. The spectacular upper Cambrian ?Orsten? fauna preserves phosphatized fossil larvae, including putative crown-group pancrustaceans with amazingly complete developmental sequences. The putative presence and nature of adult stages remains a source of debate, causing spurious placements in a traditional morphological analysis. We introduce a new coding method where each semaphoront (discrete larval or adult stage) is considered an operational taxonomic unit. This avoids a priori assumptions of heterochrony. Characters and their states are defined to identify changes in morphology throughout ontogeny. Phylogenetic analyses of semaphoronts produced possible relationships of each Orsten fossil to the crown-group clade expected from morphology shared with extant larvae. Bredocaris is a member of the stem lineage of Thecostraca or (Thecostraca + Copepoda), and Yicaris and Rehbachiella are probably members of the stem lineage of Cephalocarida. These placements rely directly on comparisons between extant and fossil larval character states. The position of Phosphatocopina remains unresolved. This method may have broader applications to other phylogenetic problems which may rely on ontogenetically variable homology statements.
Keywords
Cambrian, Crustacea, Fossils, Larvae, Ontogeny, Orsten, Pancrustacea, Semaphoront
External links
About this resource
- Canonical resource URI:
http://purl.org/phylo/treebase/phylows/study/TB2:S13368
- Other versions:
Nexus
NeXML
- Show BibTeX reference
@ARTICLE{TreeBASE2Ref21335,
author = {Jo M Wolfe and Thomas A Hegna},
title = {Testing the phylogenetic position of Cambrian pancrustacean larval fossils by coding ontogenetic stages},
year = {2013},
keywords = {Cambrian, Crustacea, Fossils, Larvae, Ontogeny, Orsten, Pancrustacea, Semaphoront},
doi = {},
url = {http://},
pmid = {},
journal = {Cladistics},
volume = {},
number = {},
pages = {},
abstract = {The study of ontogeny as an integral part of understanding the pattern of evolution dates back over 200 years, but only recently have ontogenetic data been explicitly incorporated into phylogenetic analyses. Pancrustaceans undergo radical ontogenetic changes. The spectacular upper Cambrian ?Orsten? fauna preserves phosphatized fossil larvae, including putative crown-group pancrustaceans with amazingly complete developmental sequences. The putative presence and nature of adult stages remains a source of debate, causing spurious placements in a traditional morphological analysis. We introduce a new coding method where each semaphoront (discrete larval or adult stage) is considered an operational taxonomic unit. This avoids a priori assumptions of heterochrony. Characters and their states are defined to identify changes in morphology throughout ontogeny. Phylogenetic analyses of semaphoronts produced possible relationships of each Orsten fossil to the crown-group clade expected from morphology shared with extant larvae. Bredocaris is a member of the stem lineage of Thecostraca or (Thecostraca + Copepoda), and Yicaris and Rehbachiella are probably members of the stem lineage of Cephalocarida. These placements rely directly on comparisons between extant and fossil larval character states. The position of Phosphatocopina remains unresolved. This method may have broader applications to other phylogenetic problems which may rely on ontogenetically variable homology statements.}
}
- Show RIS reference
TY - JOUR
ID - 21335
AU - Wolfe,Jo M
AU - Hegna,Thomas A
T1 - Testing the phylogenetic position of Cambrian pancrustacean larval fossils by coding ontogenetic stages
PY - 2013
KW - Cambrian
KW - Crustacea
KW - Fossils
KW - Larvae
KW - Ontogeny
KW - Orsten
KW - Pancrustacea
KW - Semaphoront
UR - http://dx.doi.org/
N2 - The study of ontogeny as an integral part of understanding the pattern of evolution dates back over 200 years, but only recently have ontogenetic data been explicitly incorporated into phylogenetic analyses. Pancrustaceans undergo radical ontogenetic changes. The spectacular upper Cambrian ?Orsten? fauna preserves phosphatized fossil larvae, including putative crown-group pancrustaceans with amazingly complete developmental sequences. The putative presence and nature of adult stages remains a source of debate, causing spurious placements in a traditional morphological analysis. We introduce a new coding method where each semaphoront (discrete larval or adult stage) is considered an operational taxonomic unit. This avoids a priori assumptions of heterochrony. Characters and their states are defined to identify changes in morphology throughout ontogeny. Phylogenetic analyses of semaphoronts produced possible relationships of each Orsten fossil to the crown-group clade expected from morphology shared with extant larvae. Bredocaris is a member of the stem lineage of Thecostraca or (Thecostraca + Copepoda), and Yicaris and Rehbachiella are probably members of the stem lineage of Cephalocarida. These placements rely directly on comparisons between extant and fossil larval character states. The position of Phosphatocopina remains unresolved. This method may have broader applications to other phylogenetic problems which may rely on ontogenetically variable homology statements.
L3 -
JF - Cladistics
VL -
IS -
ER -
Go to search
Citation
Taxa
Matrices
Trees
Analyses
