A reevaluation of early amniote phylogeny

  title={A reevaluation of early amniote phylogeny},
  author={Michel Laurin and Robert R. Reisz},
  journal={Zoological Journal of the Linnean Society},
  • M. Laurin, R. Reisz
  • Published 1 February 1995
  • Biology, Geography
  • Zoological Journal of the Linnean Society
Abstract A new phylogenetic analysis of early amniotes based on 124 characters and 13 taxa (including three outgroups) indicates that synapsids are the sister-group of all other known amniotes. The sister-group of Synapsida is Sauropsida, including Mesosauridae and Reptilia as its two main subdivisions. Reptilia is divided into Parareptilia and Eureptilia. Parareptilia includes Testudines and its fossil relatives (Procolophonidae, Pareiasauria and Millerettidae), while Eureptilia includes… 

Figures and Tables from this paper

Phylogenetic relationships of procolophonid parareptiles with remarks on their geological record
The successful radiation of the Procolophonidae during the Triassic is likely to be related to the development of feeding adaptations that allowed exploration of various ecological niches, particularly the exploitation of high‐fibre herbivory.
Reassessment of the phylogenetic interrelationships of basal turtles (Testudinata)
Perhaps the most salient conclusion of the present study is the placement of Naomichelys speciosa as a basal member of a clade uniting meiolaniids, Mongolochelys efremovi and Otwayemys cunicularius.
Response: A Reassessment of the Taxonomic Position of Mesosaurs, and a Surprising Phylogeny of Early Amniotes
The early amniote clade Mesosauridae has long been of interest to scientists, primarily due to the members of the clade being the oldest secondarily aquatic tetrapods and their role as a line of
Phylogeny, systematics, and origin of the Ichthyosauria - the state of the art
At the present state of knowledege, a defi nite decision on the origin and phylogenetic position of ichthyosaurs is still impossible, but descent from primarily anapsid ancestors and an origin from among the Parareptilia can not be excluded as an alternative to a diapsid origin of the group.
Evolution, morphology and paleobiology of the pareiasauria and their relatives
This thesis will undertake a description of some poorly-known parareptilian taxa, using the data to reassess the relationships of parareaptiles, with information gained about the phylogeny of the group serving as the basis to assess evolutionary trends within the clade.
Historical Burden In Systematics And The Interrelationships Of ‘Parareptiles’
Turtles are the highly modified survivors of a radiation of poorly‐known reptiles commonly called ‘parareptiles’, and the procolophonoid hypotheses is supported by only one synapomorphy (the slender stapes).
Pareiasaur phylogeny and the origin of turtles
Many features thought to be restricted to turtles (and thus to have evolved simultaneously with the turtle shell) actually arose earlier, at various points along the pareiasaurian stem lineage.
Proopiomelanocortin ( POMC ) and testing the phylogenetic position of turtles ( Testudines )
  • I.
  • Biology
  • 2010
Neither Maximum likelihood, Bayesian, or maximum parsimony analyses are able to falsify the hypothesis of (Archosauria (LepidosaurIA, Testudines) and as such is the preferred inference from the POMC data.
Proopiomelanocortin (POMC) and testing the phylogenetic position of turtles (Testudines)
Neither Maximum likelihood, Bayesian, or maximum parsimony analyses are able to falsify the hypothesis of (Archosauria (LepidosaurIA, Testudines) and as such is the preferred inference from the POMC data.


Classification and phylogeny of the diapsid reptiles
  • M. Benton
  • Environmental Science, Geography
  • 1985
A cladistic analysis of skull and skeletal characters of all described Permo-Triassic diapsid reptiles suggests some significant rearrangements to commonly held views of the Diapsida.
The earliest known reptile
The discovery of a much earlier amniote skeleton from the Brigantian (Lower Carboniferous) of Scotland, which thus represents the earliest occurrence of amniotes in the fossil record.
Phylogenetic relationships of captorhinomorph reptiles
Shared derived character states indicate that captorhinomorphs are not the sister taxon of all other reptiles but are advanced relative to pelycosaurs, pareiasaur, and procolophonids.
Definition, diagnosis, and origin of Mammalia
Triassic and Early Jurassic taxa commonly referred to as mammals, including Morganucodontidae, Kuehneotheriidae, and Haramiyidae, were found to lie outside of Mammalia.
A phylogenetic analysis of lepidosauromorpha
This paper analyzes phylogenetic relationships within a subtaxon of Sauna, the Lepidosauromorpha, and attempts to stabilize the concept of each lepidosauromorph taxon with as rigorous a diagnosis as the natiu-e of the material allows.
The cranial anatomy and relationships of Secodontosaurus, an unusual mammal-like reptile (Synapsida: Sphenacodontidae) from the early Permian of Texas
The cranial anatomy of the Early Permian sphenacodontid synapsid Secodontosaurus is redescribed. There is no evidence for recognition of more than one species of Secodontosaurus, and S. willistoni is
The fossil record of early amniotes is complete enough to establish their relationships to the major groups living today and provides an opportunity to consider the evolutionary processes associated with a period of major radiation.
On Millerosaurus and the early history of the sauropsid reptiles
  • D. Watson
  • Environmental Science, Geography
    Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
  • 1957
The Millerosauria provide a starting point for the development of all sauropsids except perhaps the Chelonia, and the real resemblance of the millerosaurs to primitive captorhinids and pelycosaurs is evidence of a common ultimate derivation from anthracosaurs.
Plesiosaur Ancestors from the Upper Permian of Madagascar
The nature of the Upper Permian sediments in Madagascar and the tectonic environment of their deposition indicate accumulation in deep rift valleys, some parts of which were open to the sea, and the presence of oolites replaced with collophane suggests a rich phosphate source such as deep marine upwellings.
Researches on the Structure, Organization, and Classification of the Fossil Reptilia. VI. On the Anomodont Reptilia and Their Allies
The chief contributions to a knowledge of the Anomodont skull have been made by Sir Richard Owen, Professor Huxley, and Professor Cope, who said to show a blending of Chelonian and Lizard structures.