Has the importance of the amniote egg been overstated

@article{Skulan2000HasTI,
  title={Has the importance of the amniote egg been overstated},
  author={Joseph L. Skulan},
  journal={Zoological Journal of the Linnean Society},
  year={2000},
  volume={130},
  pages={235-261}
}
  • J. Skulan
  • Published 2000
  • Biology
  • Zoological Journal of the Linnean Society
Abstract The evolution of the amniote egg is commonly regarded as an important milestone in the history of the vertebrates, an innovation that completed the transition from aquatic to fully terrestrial existence by permitting eggs to be laid away from standing water. This view derives ultimately from the recapitulationist theories of Haeckel, and rests on the assumption that extant frogs and salamanders are good models for the reproductive habits of early tetrapods and the ancestors of the… Expand
Development in frogs with large eggs and the origin of amniotes.
The origin of the amniote egg is one of the most significant events in the evolution of terrestrial vertebrates. This innovation was probably driven by increased egg size, and to find potentialExpand
Phylogeny and evolutionary history of the amniote egg
TLDR
Except for the amnion, chorioallantois, and amniote type of eggshell, these features evolved convergently in almost all major clades of aquatic vertebrates possibly in response to selective factors such as egg predation, hostile environmental conditions for egg development, or to adjust hatching of young to favorable season. Expand
Morphological research on amniote eggs and embryos: An introduction and historical retrospective
TLDR
Recent research on various aspects of amniote eggs is summarized, including gastrulation, egg shape and eggshell morphology, eggs of Mesozoic dinosaurs, sauropsid yolk sacs, squamate placentation, embryogenesis, and the phylotypic phase of embryonic development. Expand
Extended embryo retention, caecilian oviparity and amniote origins
TLDR
The objections raised by Laurin et al. (2000) do not substantiate the conclusions of Laurin and Reisz (1997), and the available data are more consistent with the traditional hypothesis that the amniotic egg originated as an adaptation of eggs to the terrestrial environment. Expand
The oldest known amniotic embryos suggest viviparity in mesosaurs
TLDR
The finds of exceptional, well-preserved amniotic mesosaur embryos from the Early Permian of Uruguay and Brazil provide the earliest direct evidence of reproductive biology in Paleozoic amniotes and the earliest known case of viviparity. Expand
Embryo retention, character optimization, and the origin of the extra‐embryonic membranes of the amniotic egg
This study summarizes the data relevant to understanding the appearance of the amniotic egg and provides new analyses to determine the inferences that can be drawn from these data. A survey of theExpand
Microanatomy of the radius and lifestyle in amniotes (Vertebrata, Tetrapoda)
TLDR
The discriminant function based on taxa of known lifestyle is used to infer the lifestyle of three extinct amniotes: the early nothosaur Pachypleurosaurus, therapsid Lystrosaurus and the synapsid Ophiacodon and these predictions are congruent with classical palaeoecological interpretations. Expand
The evolution of parental investment in caecilian amphibians: a comparative approach
TLDR
More data regarding reproductive biology are needed to obtain a fully resolved understanding of the evolution of reproduction in caecilian amphibians, and via alternative pathways of parental investment, teresomatan caecilians increase both offspring size and quality. Expand
The emergence of early tetrapods
Abstract Study of Devonian tetrapods and their relatives spanning the so-called ‘fish–tetrapod’ transition has expanded almost exponentially in the last 15 years or so. This evolutionary event is nowExpand
Reproductive ecology of female caecilian amphibians (genus Ichthyophis): a baseline study
TLDR
Key life history data is presented for the oviparous caecilian Ichthyophis cf. Expand
...
1
2
3
...

References

SHOWING 1-10 OF 93 REFERENCES
Evolution of the amniote egg
TLDR
Several lines of evidence indicate that the barriers to diffuse movement of oxygen through the jelly hinders the metabolism of embryos of contemporary amphibians late in development, particularly in large eggs or in eggs naturally incubated at higher temperatures. Expand
CHAPTER 9 – MORPHOLOGY AND EVOLUTION OF THE EGG OF OVIPAROUS AMNIOTES
This section gives an elaborate interface between the developing embryo and its immediate environment. It shows how the structures compartmentalize the egg by enclosing specific egg and embryonicExpand
Evolution of the Cleidoic Egg Among Reptilian Antecedents of Birds
TLDR
Adaptive increases in thickness of the eggshell required coupled increases in the amount of water contained by eggs at oviposition, thereby reducing the degree of dependence of embryos upon external sources of water for successful completion of development. Expand
Reflections on the origin of the amniote egg in the light of reproductive strategies and shell structure
TLDR
It is suggested that the early evolution of the amniote egg happened within the aquatic realm, and the function of the shell, to protect the embryo against microbial activity and to prevent water loss, was the terminal step in this process. Expand
EARLY EVOLUTION OF REPTILES
TLDR
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. Expand
The Influence of Ambient Temperature and Aridity on Modes of Reproduction and Excretion of Amniote Vertebrates
TLDR
It is contended that the amniote egg was the first stage in adaptation to terrestrial development of embryos, and that evolutionary refinements of this structure (as well as those involving nitrogen metabolism) culminated in the avian egg. Expand
Fetal Maintenance and Its Evolutionary Significance in the Amphibia: Gymnophiona
TLDR
It is concluded that the species-specific fetal dentition is functional in obtaining nutrition in the oviduct, in contrast to previous suggestions. Expand
Direct development in the lungless salamanders: what are the consequences for developmental biology, evolution and phylogenesis?
  • D. Wake, J. Hanken
  • Medicine, Biology
  • The International journal of developmental biology
  • 1996
TLDR
Analysis of direct development in an evolutionary context illustrates the complex interplay between processes of phylogenetic divergence and developmental biology, and substantiates the prominent role of developmental processes in both constraining phenotypic variation and promoting phenotypesic diversity. Expand
The skull and jaw musculature as guides to the ancestry of salamanders
TLDR
Reconstruction of the probable pattern of the jaw musculature in Paleozoic amphibians indicates that frogs and salamanders might have evolved from a condition hypothesized for primitive labyrinthodonts, but the presence of a large otic notch in dissorophids suggests specialization toward the anuran, not the urodele condition. Expand
CHAPTER 12 – WATER BALANCE AND THE PHYSIOLOGY OF THE AMPHIBIAN TO AMNIOTE TRANSITION
This chapter explores the composition of animals' body, and that water is the most important substance in terms of composition, whereby animals contain 70% water by mass and 99% water by number ofExpand
...
1
2
3
4
5
...