| 41. | Amniotes are tetrapods ( descendants of four-limbed and backboned animals ) that are characterised by having an fetus.
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| 42. | Although they bear similarities to those of amniotes, the tarsal bones of diadectids are poorly ossified and loosely connected.
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| 43. | This allowed amniotes to lay eggs on dry land, while amphibians generally need to lay their eggs in water.
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| 44. | In amniotes, most of the former opisthonephros became the epididymis, and the archinephric duct became the vas deferens.
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| 45. | The first amniotes are known from the early part of the baphetids, which have left no extant surviving lineages.
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| 46. | Reptiles have relatively few nephrons compared with other amniotes of a similar size, possibly because of their lower metabolic rate.
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| 47. | Inhaling with the ribs was either primitive for amniotes, or evolved independently in at least two different lineages of amniotes.
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| 48. | Inhaling with the ribs was either primitive for amniotes, or evolved independently in at least two different lineages of amniotes.
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| 49. | Very early in the evolutionary history of amniotes, basal amniotes sauropsids, both of which persist into the modern era.
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| 50. | Very early in the evolutionary history of amniotes, basal amniotes sauropsids, both of which persist into the modern era.
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