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1. • • The first amniotes evolved from amphibian ancestors approximately 340 million years ago during the Carboniferous period.
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     Evolution of Amniotes | Biology for Majors II

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   How did amniotes evolve?

   • The first amniotes evolved from amphibian ancestors approximately 340 million years ago during the Carboniferous period. The early amniotes diverged into two main lines soon after the first amniotes arose. The initial split was into synapsids and sauropsids. Synapsids include all mammals, including extinct mammalian species.

   Evolution of Amniotes | Biology for Majors II - Lumen Learning

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   When were amniotes discovered?

   • The first amniotes are recognised from the Carboniferous period (c. 320 Ma BP) based on skeletal characters (e.g. two sacral ribs, ankle structure), because until the development of calcareous shells, eggs were rarely fossilised. These early fossil amniotes were already split between two major clades, Synapsida and Sauropsida (Fig. 1 ).

   Evolution and Phylogeny of Amniotes | SpringerLink

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   Where did amniotes come from?

   • The origin of amniotes is therefore anchored by two disparate disciplines: developmental biology and vertebrate paleontology. The amniotic egg is at the center of the great evolutionary success of the crown group Amniota.

   Origin of Amniotes and the Amniotic Egg - Oxford Bibliographies

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   What is the paradigm of early amniote evolution?

   • The current paradigm of early amniote evolution was established in the late twentieth century 1, 2. It includes a deep crown group dichotomy between Synapsida (total group mammals) and Reptilia (total group reptiles, including birds), followed by an early divergence of Parareptilia from all other reptiles (Eureptilia) 3, 4.

   The phylogeny of early amniotes and the affinities of

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3. courses.lumenlearning.com › evolution-of-amniotesEvolution of Amniotes | Biology for Majors II - Lumen Learning

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   Discuss the evolution of amniotes. The first amniotes evolved from amphibian ancestors approximately 340 million years ago during the Carboniferous period. The early amniotes diverged into two main lines soon after the first amniotes arose. The initial split was into synapsids and sauropsids.

4. bio.libretexts.org › Courses › Lumen_Learning15.6: Evolution of Amniotes - Biology LibreTexts

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   Feb 28, 2021 · The first amniotes evolved from amphibian ancestors approximately 340 million years ago during the Carboniferous period. The early amniotes diverged into two main lines soon after the first amniotes arose. The initial split was into synapsids and sauropsids. Synapsids include all mammals, including extinct mammalian species. Synapsids also ...

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6. bio.libretexts.org › Bookshelves › Introductory_and29.3C: Evolution of Amniotes - Biology LibreTexts

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   Oct 31, 2023 · Evolution of Amniotes. The first amniotes evolved from their amphibian ancestors approximately 340 million years ago during the Carboniferous period. The early amniotes diverged into two main lines soon after the first amniotes arose. The initial split was into synapsids and sauropsids. Synapsids include all mammals, including extinct mammalian ...

7. link.springer.com › referenceworkentry › 10Evolution and Phylogeny of Amniotes | SpringerLink

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   Jan 1, 2024 · Characteristics. The first amniotes are recognised from the Carboniferous period (c. 320 Ma BP) based on skeletal characters (e.g. two sacral ribs, ankle structure), because until the development of calcareous shells, eggs were rarely fossilised. These early fossil amniotes were already split between two major clades, Synapsida and Sauropsida ...

   • Author: Susan E. Evans

8. www.oxfordbibliographies.com › abstract › documentOrigin of Amniotes and the Amniotic Egg - Evolutionary ...

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   Aug 22, 2023 · The developmental strategy of amniotes is characterized by the evolutionary innovation of a series of four extraembryonic membranes—the yolk sac, allantois, chorion, and amnion—that provide a complete developmental environment for the embryonic life of a reptile, bird, or mammal.

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10. www.nature.com › articles › s41559/019/1047-3The phylogeny of early amniotes and the affinities ... - Nature

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    Dec 23, 2019 · The Science of Nature (2023) Amniotes include mammals, reptiles and birds, representing 75% of extant vertebrate species on land. They originated around 318 million years ago in the early Late...

11. www.zo.utexas.edu › courses › evolutionThe Amniotes: “Reptiles”, birds, and mammals

    www.zo.utexas.edu › courses › evolution

    Phylogeny of the Amniotes shows a non-monophyletic Reptilia, since birds and possibly even mammals were descended from the shared ancestor to all “reptiles”. Major lineages include turtles; giant aquatic reptiles (extinct); a clade of lizards and snakes; crocodilians, pterosaurs; birds; and the dinosaurs.