@ARTICLE{TreeBASE2Ref15098,
author = {Peter R. Crane},
title = {Phylogenetic relationships in seed plants.},
year = {1985},
keywords = {},
doi = {},
url = {},
pmid = {},
journal = {Cladistics},
volume = {1},
number = {},
pages = {329--348},
abstract = {The phylogenetic relationships of nineteen extant and fossil seed plants are considered. Analysis of 31 characters produced ten topologically similar and equally parsimonious cladograms. A strict consensus tree derived from these cladograms places Lyginopteris as the sister taxon to the other seed plants included. Within this clade all the taxa considered, except medullosans and cycads, form a single monophyletic group defined by the presence of flattened seeds and saccate pollen (platysperms). Relationships between medullosans, cycads, and platysperms were not resolved, but within the platysperm clade conifers and cordaites (Cordaixylon, Mesoxylon) + Ginkgo form a monophyletic group (coniferophytes). The higher platysperms (glossopterids, Caytonia, corystosperms, Bennettitales, Pentoxylon, Gnetales, and angiosperms) are also monophyletic, but their relationship to coniferophytes, peltasperms, and Callistophyton is unresolved. Pentoxylon is placed as sister taxon to the Bennettitales, and together they form the sister group to a clade in which Gnetales and angiosperm are sister taxa. The Bennettitales + Pentoxylon + Gnetales + angiosperms (anthophytes) form a monophyletic sister group to the corystosperms. This analysis is compared with current classifications of seed plants. It does not support a close relationship between Bennettitales and cycads, it provides no evidence for seed plant polyphyly, and it strongly suggests that the current concept of seed ferns has little value in a phylogenetic context.}
}
Citation for Study 229
Citation title:
"Phylogenetic relationships in seed plants.".
This study was previously identified under the legacy study ID S2x5x96c17c49c16
(Status: Published).
Citation
Crane P. 1985. Phylogenetic relationships in seed plants. Cladistics, 1: 329-348.
Authors
Abstract
The phylogenetic relationships of nineteen extant and fossil seed plants are considered. Analysis of 31 characters produced ten topologically similar and equally parsimonious cladograms. A strict consensus tree derived from these cladograms places Lyginopteris as the sister taxon to the other seed plants included. Within this clade all the taxa considered, except medullosans and cycads, form a single monophyletic group defined by the presence of flattened seeds and saccate pollen (platysperms). Relationships between medullosans, cycads, and platysperms were not resolved, but within the platysperm clade conifers and cordaites (Cordaixylon, Mesoxylon) + Ginkgo form a monophyletic group (coniferophytes). The higher platysperms (glossopterids, Caytonia, corystosperms, Bennettitales, Pentoxylon, Gnetales, and angiosperms) are also monophyletic, but their relationship to coniferophytes, peltasperms, and Callistophyton is unresolved. Pentoxylon is placed as sister taxon to the Bennettitales, and together they form the sister group to a clade in which Gnetales and angiosperm are sister taxa. The Bennettitales + Pentoxylon + Gnetales + angiosperms (anthophytes) form a monophyletic sister group to the corystosperms. This analysis is compared with current classifications of seed plants. It does not support a close relationship between Bennettitales and cycads, it provides no evidence for seed plant polyphyly, and it strongly suggests that the current concept of seed ferns has little value in a phylogenetic context.
About this resource
- Canonical resource URI:
http://purl.org/phylo/treebase/phylows/study/TB2:S229
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@ARTICLE{TreeBASE2Ref15098,
author = {Peter R. Crane},
title = {Phylogenetic relationships in seed plants.},
year = {1985},
keywords = {},
doi = {},
url = {},
pmid = {},
journal = {Cladistics},
volume = {1},
number = {},
pages = {329--348},
abstract = {The phylogenetic relationships of nineteen extant and fossil seed plants are considered. Analysis of 31 characters produced ten topologically similar and equally parsimonious cladograms. A strict consensus tree derived from these cladograms places Lyginopteris as the sister taxon to the other seed plants included. Within this clade all the taxa considered, except medullosans and cycads, form a single monophyletic group defined by the presence of flattened seeds and saccate pollen (platysperms). Relationships between medullosans, cycads, and platysperms were not resolved, but within the platysperm clade conifers and cordaites (Cordaixylon, Mesoxylon) + Ginkgo form a monophyletic group (coniferophytes). The higher platysperms (glossopterids, Caytonia, corystosperms, Bennettitales, Pentoxylon, Gnetales, and angiosperms) are also monophyletic, but their relationship to coniferophytes, peltasperms, and Callistophyton is unresolved. Pentoxylon is placed as sister taxon to the Bennettitales, and together they form the sister group to a clade in which Gnetales and angiosperm are sister taxa. The Bennettitales + Pentoxylon + Gnetales + angiosperms (anthophytes) form a monophyletic sister group to the corystosperms. This analysis is compared with current classifications of seed plants. It does not support a close relationship between Bennettitales and cycads, it provides no evidence for seed plant polyphyly, and it strongly suggests that the current concept of seed ferns has little value in a phylogenetic context.}
}
- Show RIS reference
TY - JOUR
ID - 15098
AU - Crane,Peter R.
T1 - Phylogenetic relationships in seed plants.
PY - 1985
UR -
N2 - The phylogenetic relationships of nineteen extant and fossil seed plants are considered. Analysis of 31 characters produced ten topologically similar and equally parsimonious cladograms. A strict consensus tree derived from these cladograms places Lyginopteris as the sister taxon to the other seed plants included. Within this clade all the taxa considered, except medullosans and cycads, form a single monophyletic group defined by the presence of flattened seeds and saccate pollen (platysperms). Relationships between medullosans, cycads, and platysperms were not resolved, but within the platysperm clade conifers and cordaites (Cordaixylon, Mesoxylon) + Ginkgo form a monophyletic group (coniferophytes). The higher platysperms (glossopterids, Caytonia, corystosperms, Bennettitales, Pentoxylon, Gnetales, and angiosperms) are also monophyletic, but their relationship to coniferophytes, peltasperms, and Callistophyton is unresolved. Pentoxylon is placed as sister taxon to the Bennettitales, and together they form the sister group to a clade in which Gnetales and angiosperm are sister taxa. The Bennettitales + Pentoxylon + Gnetales + angiosperms (anthophytes) form a monophyletic sister group to the corystosperms. This analysis is compared with current classifications of seed plants. It does not support a close relationship between Bennettitales and cycads, it provides no evidence for seed plant polyphyly, and it strongly suggests that the current concept of seed ferns has little value in a phylogenetic context.
L3 -
JF - Cladistics
VL - 1
IS -
SP - 329
EP - 348
ER -