Phylogenetic aspects of Cetacean origins: A morphological perspective

@article{Thewissen2005PhylogeneticAO,
  title={Phylogenetic aspects of Cetacean origins: A morphological perspective},
  author={J. G. M. Thewissen},
  journal={Journal of Mammalian Evolution},
  year={2005},
  volume={2},
  pages={157-184}
}
  • J. Thewissen
  • Published 2005
  • Biology
  • Journal of Mammalian Evolution
The evolutionary steps leading up to the origin of cetaceans involved pervasive changes in the masticatory apparatus, the ear, and limb morphology. These changes bear heavily on the phylogenetic relationships of Cetacea, and are investigated here on the basis of two of its earliest members:Pakicetus andAmbulocetus. A phylogenetic analysis of cetaceans, five groups of mesonychians, and five other groups of ungulates indicates thatPakicetus is the sister group to all other cetaceans, and that… Expand

Figures and Tables from this paper

Impact of increased character sampling on the phylogeny of Cetartiodactyla (Mammalia): combined analysis including fossils
The phylogenetic position of Cetacea (whales, dolphins and porpoises) is an important exemplar problem for combined data parsimony analyses because the clade is ancient and includes many well‐knownExpand
Phylogenetic Relationships of Extinct Cetartiodactyls: Results of Simultaneous Analyses of Molecular, Morphological, and Stratigraphic Data
TLDR
Both analyses supported the exclusion of Mesonychia from Cetartiodactyla and a close phylogenetic relationship between Hippopotamidae and Cetacea, and added stratigraphic information to the intrinsic dataset, which found fewer most parsimonious trees. Expand
A New Protocetid Whale (Cetacea: Archaeoceti) from the Late Middle Eocene of South Carolina
TLDR
A new genus and species of protocetid cetacean is described from a partial skull, the posterior portion of both dentaries, 13 vertebrae, and elements of 15 ribs found in the Cross Member of the late middle Eocene Tupelo Bay Formation in Berkeley County, South Carolina. Expand
Cetacean Evolution and Systematics
TLDR
New discoveries of fossil whales provide compelling evidence for both the phylogenetic connections of cetaceans as well as the evolutionary transformation from a terrestrial to a fully aquatic existence. Expand
Phylogenetic Relationships Between the Orders Artiodactyla and Cetacea: A Combined Assessment of Morphological and Molecular Evidence
TLDR
It is suggested that increased taxon sampling, combined with functional considerations of amino acids and their secondary structure in protein-coding genes, are essential requirements for the phylogenetic interpretations of molecules at higher taxonomic levels, especially when they conflict with well-supported hypotheses of mammalian phylogeny. Expand
Relationships of Endemic African Mammals and Their Fossil Relatives Based on Morphological and Molecular Evidence
TLDR
Analyses of anatomical and DNA sequence data run on a parallel supercomputer that include fossil taxa support the inclusion of tenrecs and golden moles in the Afrotheria, an endemic African clade of placental mammals, and support the position of AfroTheria as well-nested, not basal, within Placentalia. Expand
MORPHOLOGICAL SUPPORT FOR A CLOSE RELATIONSHIP BETWEEN HIPPOS AND WHALES
TLDR
It is reported that morphological data from extinct and extant taxa support placement of Cetacea within Artiodactyla as the closest relatives of Hippopotamidae and indicate that molecular and morphological evidence for the phylogeny of these taxa are now much more congruent than previously thought. Expand
A new species of mesonychian mammal from the lower Eocene of Mongolia and its phylogenetic relationships
We describe Dissacus zanabazari new species from a partial skeleton collected from the early Eocene Bumban Member of the Naran Bulak Formation at Tsagaan Khushuu (Omnogov Province, Mongolia). TheExpand
Molecular phylogeny and evolution of prosimians based on complete sequences of mitochondrial DNAs.
TLDR
To estimates the speciation dates within primates, the amino acid sequences of mt-proteins were analyzed with a Bayesian method of Thorne and Kishino and the biogeographic scenarios which have been proposed for the origin of strepsirrhini and for the dispersal of the lemuriformes and lorisiformes were reexamined. Expand
THE POSTCRANIAL SKELETON OF EARLY EOCENE PAKICETID CETACEANS
  • S. Madar
  • Biology
  • Journal of Paleontology
  • 2007
TLDR
When both postcranial morphology and microstructure are considered, it can be concluded that pakicetid cetaceans were highly adapted for an aquatic niche. Expand
...
1
2
3
4
...

References

SHOWING 1-10 OF 153 REFERENCES
The role of phenacodontids in the origin of the modern orders of ungulate mammals
TLDR
The role of the ancestral ungulates Phenacodontidae in the evolution of Perissodactyla, HyracoideA, Proboscidea, Sirenia, and Desmostylia is investigated on the basis of parsimony analysis of dental, cranial, and postcranial data. Expand
Molecular evidence for the inclusion of cetaceans within the order Artiodactyla.
TLDR
It is estimated that the whale lineage has branched off a protoruminant lineage < 50 Mya, and the cetacean transition to aquatic life is inferred to be a relatively recent evolutionary event. Expand
The petrosal structure of Hyopsodus with respect to that of some other ungulates, and its phylogenetic implications
The auditory anatomy of Hyopsodus, an Eocene condylarth, is described on the basis of isolated petrosals from Tabernacle Butte, Wyoming. Comparisons are made with some primitive eutherians and withExpand
Phylogeny of all major groups of cetaceans based on DNA sequences from three mitochondrial genes.
TLDR
A molecular phylogeny based on 1,352 base pairs of two mitochondrial ribosomal gene segments and the mitochondrial cytochrome b gene for all major groups of cetaceans contradicts this long-accepted taxonomic subdivision and suggests a more recent origin of baleen whales than has been previously assumed. Expand
The eutherian stapedial artery: character analysis and implications for superordinal relationships
Evidence from outgroups, ontogeny, neontology, and fossils is used to distinguish primitive and derived character states for the major components of the eutherian stapedial artery in 17 modernExpand
ORIGIN AND EVOLUTION OF FUNCTION OF THE MESONYCHID CONDYLARTH FEEDING MECHANISM
  • F. Szalay
  • Biology, Medicine
  • Evolution; international journal of organic evolution
  • 1969
TLDR
This study concerns itself with the morphological and functional changes from the presumed triisodont ancestry to the first mesonychids, in spite of the fact that certain characters, which are judged to be primitive, of Eocene genera are used as evidence. Expand
Biomolecular Systematics of Eutherian Mammals: Phylogenetic Patterns and Classification
The higher-level systematics of the mammalian infraclass Eutheria is investigated with protein sequences of seven polypeptide types combined in an extended tandem alignment. Evolutionary treesExpand
Mammalian phylogeny: comparison of morphological and molecular results.
  • J. Shoshani
  • Biology, Medicine
  • Molecular biology and evolution
  • 1986
TLDR
The morphological and molecular phylogenies agree in depicting the infraclass Eutheria as consisting of five major clades (thus resolving part of the "bush"). Expand
HIGHER‐LEVEL RELATIONSHIPS OF THE RECENT EUTHERIAN ORDERS: MORPHOLOGICAL EVIDENCE
TLDR
Comparison morphology and paleontology offer some compelling hypotheses that comprise a framework for studies of macromolecular traits that support groupings of the Recent orders of eutherian mammals. Expand
The Evolutionary History of Whales and Dolphins
Cetaceans-the whales, dolphins, and porpoises-are the taxonomically most diverse clade of aquatic mammals, with a fossil record going back at least to Middle Eocene time (52 Ma-millions of yearsExpand
...
1
2
3
4
5
...