The anamniotes are a group of vertebrates that lack the amnion during fetal development. These animals are not able to have embryos that develop on land, thus they lay their eggs in water exclusively. The group contain the fishes and amphibians, the "lower" vertebrates, as opposed to the amniotes, the "higher" vertebrates. The features unifying the anamniotes was first noted by Thomas Henry Huxley, who coined the phrase Ichtioid or Ichthyopsida ("fish-face") for the group.

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  • The anamniotes are a group of vertebrates that lack the amnion during fetal development. These animals are not able to have embryos that develop on land, thus they lay their eggs in water exclusively. The group contain the fishes and amphibians, the "lower" vertebrates, as opposed to the amniotes, the "higher" vertebrates. The features unifying the anamniotes was first noted by Thomas Henry Huxley, who coined the phrase Ichtioid or Ichthyopsida ("fish-face") for the group. The group representing an evolutionary grade rather than a clade, the term anamniote is now used as an informal way of denoting the physical property of the group, rather than as a systematic unit.
  • Les Anamniotes sont des Vertébrés dont l'embryon ne possède pas d'amnios, comme les Cyclostomes, les Poissons et les Amphibiens. Du point de vue phylogénétique, il ne s'agit pas d'un groupe pertinent, car il est défini par un caractère négatif, par opposition aux Amniotes, alors qu'ils ont un même ancêtre commun.
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  • TriturusVulgarisLarva.JPG
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  • Anamniotes have a distinct larval stag, here a smooth newt
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  • Trouts spawning showing typical anamniote external fertilization
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  • The anamniotes are a group of vertebrates that lack the amnion during fetal development. These animals are not able to have embryos that develop on land, thus they lay their eggs in water exclusively. The group contain the fishes and amphibians, the "lower" vertebrates, as opposed to the amniotes, the "higher" vertebrates. The features unifying the anamniotes was first noted by Thomas Henry Huxley, who coined the phrase Ichtioid or Ichthyopsida ("fish-face") for the group.
  • Les Anamniotes sont des Vertébrés dont l'embryon ne possède pas d'amnios, comme les Cyclostomes, les Poissons et les Amphibiens. Du point de vue phylogénétique, il ne s'agit pas d'un groupe pertinent, car il est défini par un caractère négatif, par opposition aux Amniotes, alors qu'ils ont un même ancêtre commun.
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  • Anamniotes
  • Anamniotes
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