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erratum in Re: LATE SURVIVING CYNODONT (
Please replace 'Theropsids' by Reptilia (slip of the pen, will never
mail again late in the evening).
> Very right. The stapes we mammals inherited from our pre-Synapsid amniote
> ancestor since this small bone is also present in extant Theropsids,
> lizards and birds. Articular became malleus, quadrate became incus,
> and the other postdentary bone, the angular with its reflected lamina became
> the tympanic bone, which holds the eardrum.
> According to a theory advocated by Allin, the intermediate cynodont
> status with its already reduced postdentary bones already played some
> role in conducting sounds from the eardrum (behind the squamosal) to
> the fenestra ovalis in the braincase (one problem with this theory:
> the high inertia of this intermediate structures only allowed
> conduction of very low frequency sounds).