| The physiological site of the defect in these mice, the chorionic placenta, is found only in therian mammals. |
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| Thus, relative to the primitive therian condition, marsupials have a distinctive, derived pattern of reduced dental replacement. |
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| As one might guess, the post-cranial skeleton is a mosaic of basal mammaliform and therian characters. |
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| The depression is the scar marking the overlap of the jugal process of the zygomatic arch on to the maxilla, as in therian mammals generally. |
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| Chromosomal gene movements reflect the recent origin and biology of therian sex chromosomes. |
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| Granted, totemism and therianthropy weave very closely in my life, and there may be some connection there, but I don't think I am a totemist solely because I am a therian. |
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| In this way the ancestor of therian mammals came to possess a single generation of replacement teeth, which erupt when the jaw reaches a size large enough to accommodate them. |
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| The evolutionary tree relating the mammalian species that share the amino-acid replacements dates back to the ancestral therian, 180 million years ago. |
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| Unfortunately, molar nomenclature was developed for therian mammals, and some of the terminology turns out not to work very well at this fundamental level. |
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| Other major events include the appearance of the earliest lizards, and the evolution of therian mammals, including primitive placentals. |
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