Advanced

Extended mitogenomic phylogenetic analyses yield new insight into crocodylian evolution and their survival of the Cretaceous–Tertiary boundary

Roos, Jonas; Aggarwal, Ramesh K and Janke, Axel LU (2007) In Molecular Phylogenetics and Evolution 45(2). p.663-673
Abstract
caiman,

Paleosuchus trigonatus, and Cuvier’s dwarf caiman, Paleosuchus palpebrosus, were sequenced and included in a mitogenomic phylogenetic

study. The phylogenetic analyses, which included a total of ten crocodylian species, yielded strong support to a basal split

between Crocodylidae and Alligatoridae. Osteolaemus fell within the Crocodylidae as the sister group to Crocodylus. Gavialis and Tomistoma,

which joined on a common branch, constituted a sister group to Crocodylus/Osteolaemus. This suggests that extant crocodylians

are organized in two families: Alligatoridae and Crocodylidae. Within the Alligatoridae there was a basal split between Alligator and a

branch that contained... (More)
caiman,

Paleosuchus trigonatus, and Cuvier’s dwarf caiman, Paleosuchus palpebrosus, were sequenced and included in a mitogenomic phylogenetic

study. The phylogenetic analyses, which included a total of ten crocodylian species, yielded strong support to a basal split

between Crocodylidae and Alligatoridae. Osteolaemus fell within the Crocodylidae as the sister group to Crocodylus. Gavialis and Tomistoma,

which joined on a common branch, constituted a sister group to Crocodylus/Osteolaemus. This suggests that extant crocodylians

are organized in two families: Alligatoridae and Crocodylidae. Within the Alligatoridae there was a basal split between Alligator and a

branch that contained Paleosuchus and Caiman. The analyses also provided molecular estimates of various divergences applying recently

established crocodylian and outgroup fossil calibration points. Molecular estimates based on amino acid data placed the divergence

between Crocodylidae and Alligatoridae at 97–103 million years ago and that between Alligator and Caiman/Paleosuchus at 65–72 million

years ago. Other crocodilian divergences were placed after the Cretaceous–Tertiary boundary. Thus, according to the molecular estimates,

three extant crocodylian lineages have their roots in the Cretaceous. Considering the crocodylian diversification in the Cretaceous

the molecular datings suggest that the extinction of the dinosaurs was also to some extent paralleled in the crocodylian evolution. However,

for whatever reason, some crocodylian lineages survived into the Tertiary.

2007 Elsevier Inc. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Crocodylia, Crocodylian evolution, K/T boundary, Mass extinction, Mitogenomics, Mitochondrial genome, Osteolaemus, Paleosuchus
in
Molecular Phylogenetics and Evolution
volume
45
issue
2
pages
663 - 673
publisher
Elsevier
external identifiers
  • wos:000250853400019
  • scopus:34948911730
ISSN
1095-9513
DOI
10.1016/j.ympev.2007.06.018
language
English
LU publication?
yes
id
3d76806b-809f-4552-ac06-69529feaf7d5 (old id 620955)
date added to LUP
2007-12-30 09:40:31
date last changed
2017-10-01 03:39:13
@article{3d76806b-809f-4552-ac06-69529feaf7d5,
  abstract     = {caiman,<br/><br>
Paleosuchus trigonatus, and Cuvier’s dwarf caiman, Paleosuchus palpebrosus, were sequenced and included in a mitogenomic phylogenetic<br/><br>
study. The phylogenetic analyses, which included a total of ten crocodylian species, yielded strong support to a basal split<br/><br>
between Crocodylidae and Alligatoridae. Osteolaemus fell within the Crocodylidae as the sister group to Crocodylus. Gavialis and Tomistoma,<br/><br>
which joined on a common branch, constituted a sister group to Crocodylus/Osteolaemus. This suggests that extant crocodylians<br/><br>
are organized in two families: Alligatoridae and Crocodylidae. Within the Alligatoridae there was a basal split between Alligator and a<br/><br>
branch that contained Paleosuchus and Caiman. The analyses also provided molecular estimates of various divergences applying recently<br/><br>
established crocodylian and outgroup fossil calibration points. Molecular estimates based on amino acid data placed the divergence<br/><br>
between Crocodylidae and Alligatoridae at 97–103 million years ago and that between Alligator and Caiman/Paleosuchus at 65–72 million<br/><br>
years ago. Other crocodilian divergences were placed after the Cretaceous–Tertiary boundary. Thus, according to the molecular estimates,<br/><br>
three extant crocodylian lineages have their roots in the Cretaceous. Considering the crocodylian diversification in the Cretaceous<br/><br>
the molecular datings suggest that the extinction of the dinosaurs was also to some extent paralleled in the crocodylian evolution. However,<br/><br>
for whatever reason, some crocodylian lineages survived into the Tertiary.<br/><br>
 2007 Elsevier Inc. All rights reserved.},
  author       = {Roos, Jonas and Aggarwal, Ramesh K and Janke, Axel},
  issn         = {1095-9513},
  keyword      = {Crocodylia,Crocodylian evolution,K/T boundary,Mass extinction,Mitogenomics,Mitochondrial genome,Osteolaemus,Paleosuchus},
  language     = {eng},
  number       = {2},
  pages        = {663--673},
  publisher    = {Elsevier},
  series       = {Molecular Phylogenetics and Evolution},
  title        = {Extended mitogenomic phylogenetic analyses yield new insight into crocodylian evolution and their survival of the Cretaceous–Tertiary boundary},
  url          = {http://dx.doi.org/10.1016/j.ympev.2007.06.018},
  volume       = {45},
  year         = {2007},
}