| 1. | Ausktribosphenidae and monotremes have been assigned to the larger group Australosphenida.
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| 2. | The construction of the lower jaw differs from existing monotremes.
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| 3. | For example, all gargoyle females lay eggs just as monotremes do.
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| 4. | All mammals, besides monotremes gestate in their mother's womb.
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| 5. | There were also echidnas ( one of two species of monotremes ).
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| 6. | The existing monotreme species are the platypus and four species of echidnas.
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| 7. | Platypuses and two genera of echidna are Australian monotremes.
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| 8. | An age of approximately 123 million years makes this the earliest known monotreme.
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| 9. | The monotremes have a sex determination system different from that of most other mammals.
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| 10. | The modern platypus, a monotreme, appeared.
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