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The term ichthyopsida means fish-face or fish-like as opposed to the Sauropsida or lizard-face animals (reptiles and birds) and the mammals. [6] 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.
File talk:Basiliscus plumifrons (Caño Negro).jpg; File talk:Benny Trapp Griechischer Frosch Rana graeca.jpg; File talk:Benny Trapp Triturus macedonicus Griechenland.jpg; File talk:Bindenwaran 1.jpg; File talk:Blue Iguana on Wilderness Trail at QEII Botanic Park.jpg; File talk:Bombina bombina 1 (Marek Szczepanek) tight crop.jpg
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A. Portal talk:Amphibians; Portal talk:Amphibians and reptiles; Portal talk:Amphibians and reptiles/Selected article; Portal talk:Amphibians and reptiles/Selected article/1
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You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.
Fertilization is the fusion of gametes to produce a new organism. In animals, the process involves a sperm fusing with an ovum, which eventually leads to the development of an embryo. Depending on the animal species, the process can occur within the body of the female in internal fertilization, or outside in the case of external fertilization.
After internal fertilization and the habit of laying eggs in terrestrial environments became a reproduction strategy amongst the amniote ancestors, the next major breakthrough appears to have involved a gradual replacement of the gelatinous coating covering the amphibian egg with a fibrous shell membrane. This allowed the egg to increase both ...