Re: [dinosaur] Origolestes, new symmetrodont mammal from Early Cretaceous of China

News:

https://urldefense.proofpoint.com/v2/url?u=https-3A__phys.org_news_2019-2D12-2Dcretaceous-2Dmammal-2Devidence-2Dmodules.html&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=LbJXxRiWmNtlUZF9M9rN8LbtaHKlfBSmtrPJDAhlWLU&s=4DpIFHTllly17F7T-l5g2wenaKqKkDdUFEp1673eT2U&e= 

https://urldefense.proofpoint.com/v2/url?u=https-3A__www.scientificamerican.com_article_now-2Dhear-2Dthis-2Dnew-2Dfossils-2Dreveal-2Dearly-2Dear-2Dbone-2Devolution_&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=LbJXxRiWmNtlUZF9M9rN8LbtaHKlfBSmtrPJDAhlWLU&s=4fpDKgP659tN0m6b5nmr_7F5g3k7EolNU0aWBs_swmg&e= 

https://urldefense.proofpoint.com/v2/url?u=https-3A__www.theatlantic.com_science_archive_2019_12_the-2Devolutionary-2Dbreak-2Dthat-2Dgave-2Dmammals-2Dtheir-2Dhearing_603124_&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=LbJXxRiWmNtlUZF9M9rN8LbtaHKlfBSmtrPJDAhlWLU&s=npBJFbI4nO52S0IcyOvnzH8yB7KYNZJWgcjAkguCNVA&e= 

On Thu, Dec 5, 2019 at 11:13 AM Ben Creisler <[email protected]> wrote:

> Ben Creisler
> [email protected]
>
> A new paper:
>
> Origolestes lii gen. et sp. nov.
>
> Fangyuan Mao, Yaoming Hu, Chuankui Li, Yuanqing Wang, Morgan Hill Chase,
> Andrew K. Smith & Jin Meng (2019)
> Integrated hearing and chewing modules decoupled in a Cretaceous stem
> therian mammal.
> Science: eaay9220 (advance online publication)
> DOI: 10.1126/science.aay9220
> https://urldefense.proofpoint.com/v2/url?u=https-3A__science.sciencemag.org_content_early_2019_12_04_science.aay9220&d=DwIFaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=LbJXxRiWmNtlUZF9M9rN8LbtaHKlfBSmtrPJDAhlWLU&s=_7nRNn9SRXzHaTHV713vDZYBjaVB_nh98W_Sqa5_ov4&e= 
>
>
>
> Based on multiple 3D skeletal specimens we report a new Cretaceous stem
> therian mammal that displays decoupling of hearing and chewing apparatuses
> and functions. The auditory bones, including the surangular, have no bone
> contact with the ossified Meckel’s cartilage; the latter is loosely lodged
> on the medial rear of the dentary. This configuration probably represents
> the initial morphological stage of the definitive mammalian middle ear.
> Evidence shows that hearing and chewing apparatuses have evolved in a
> modular fashion. Starting as an integrated complex in non-mammaliaform
> cynodonts, the two modules, regulated by similar developmental and genetic
> mechanisms, eventually decoupled during the evolution of mammals, allowing
> further improvement for more efficient hearing and mastication.
>
> ===
>