Project 522: J. Meng, Y. Wang, C. Li. 2011. Transitional mammalian middle ear from a new Cretaceous Jehol eutriconodont. Nature. 472 (7342):181–185.
Specimen: Jeholodens jenkinsi (unvouchered)

Abstract

The transference of post-dentary jaw elements to the cranium of mammals as auditory ossicles is one of the central topics in evolutionary biology of vertebrates. Homologies of these bones among jawed vertebrates have long been demonstrated by developmental studies; but fossils illuminating this critical transference are sparse and often ambiguous. Here we report the first unambiguous ectotympanic (angular), malleus (articular and prearticular) and incus (quadrate) of an Early Cretaceous eutriconodont mammal from the Jehol Biota, Liaoning, China. The ectotympanic and malleus have lost their direct contact with the dentary bone but still connect the ossified Meckel’s cartilage (OMC); we hypothesize that the OMC serves as a stabilizing mechanism bridging the dentary and the detached ossicles during mammalian evolution. This transitional mammalian middle ear narrows the morphological gap between the mandibular middle ear in basal mammaliaforms and the definitive mammalian middle ear (DMME) of extant mammals; it reveals complex changes contributing to the detachment of ear ossicles during mammalian evolution.


Read the article »

Project DOI: 10.7934/P522, http://dx.doi.org/10.7934/P522
This project contains
  • 1 Media
  • 2 Documents
  • 2 Taxa
  • 2 Specimens


Download Project SDD File
Currently Viewing:
MorphoBank Project 522

    This research
    supported by



    Members

    member name taxa specimens media
    MorphoBank Curator
    Project Administrator
    Last logged in 08/07/14
    221
    Maureen Admin
    Full membership
    Last logged in 07/18/11
    000
    Jin Meng
    Full membership
    Last logged in Never
    000


    Project has no matrices defined.



    Project views

    type number of views Individual items viewed (where applicable)
    Total project views13588
    Project overview1970
    Documents list1051
    Media views3616Media search (2936 views); M86137 (680 views);
    Specimen list2741
    Taxon list2607
    Views for media list933
    Bibliography670




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project189
    Project downloads183
    Media downloads1M86137 (1 download);
    Document downloads5Matrix (4 downloads); Character and state descriptions (1 download);