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One example of a feature both groups held in common was the presence of extra-embryonic membranes (essentially, the amniotic sac) in early development, an adaptation that permitted the shift to a fully terrestrial egg.
Both presented nearly 10 transformations, showing that terrestrial egg laying is not necessarily an evolutionary tendency, but is actually an alternative strategy with no implied directionality.
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Brooding of terrestrial eggs is known in a few species.
Typical direct development of terrestrial eggs occurs in the many species of the leptodactylid genus Eleutherodactylus of Central and South America and the West Indies.
The ranid genus Sooglossus of the Seychelles islands and all members of the family Dendrobatidae in the American tropics have terrestrial eggs.
Most species carry their larvae from terrestrial egg-deposition sites to waterbodies such as small streams, swamps, temporary ponds, or to phytotelmata in leaf axils, bromeliads or tree holes.
The aquatic larval stage is lacking and, during winter, females lay about 10 large terrestrial eggs that are attended for several months until hatching [ 43].
Aquatic forms deposit as many as 400 eggs, terrestrial forms as few as 5 or 6.
Unlike the dinosaurs, which were terrestrial and laid eggs, marine reptiles were fully aquatic and bore live young.
Despite having limbs rather than fins, early tetrapods were not completely terrestrial because their eggs and larvae depended upon a moist aquatic habitat.
Dinosaurs were terrestrial and laid eggs.
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