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Fossil evidence on evolution of inner ear cochlea in Jurassic mammals.
Proc Biol Sci. 2011 Jan 07; 278(1702):28-34.PB

Abstract

The coiled cochlea is a key evolutionary innovation of modern therian mammals. We report that the Late Jurassic mammal Dryolestes, a relative to modern therians, has derived bony characteristics of therian-like innervation, but its uncoiled cochlear canal is less derived than the coiled cochlea of modern therians. This suggests a therian-like innervation evolved before the fully coiled cochlea in phylogeny. The embryogenesis of the cochlear nerve and ganglion in the inner ear of mice is now known to be patterned by neurogenic genes, which we hypothesize to have influenced the formation of the auditory nerve and its ganglion in Jurassic therian evolution, as shown by their osteological correlates in Dryolestes, and by the similar base-to-apex progression in morphogenesis of the ganglion in mice, and in transformation of its canal in phylogeny. The cochlear innervation in Dryolestes is the precursory condition in the curve-to-coil transformation of the cochlea in mammalian phylogeny. This provides the timing of the evolution, and where along the phylogeny the morphogenetic genes were co-opted into patterning the cochlear innervation, and the full coiling of the cochlea in modern therians.

Authors+Show Affiliations

Section of Vertebrate Paleontology, Carnegie Museum of Natural History, Pittsburgh, PA 15213, USA. luoz@carnegiemnh.orgNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

20667879

Citation

Luo, Zhe-Xi, et al. "Fossil Evidence On Evolution of Inner Ear Cochlea in Jurassic Mammals." Proceedings. Biological Sciences, vol. 278, no. 1702, 2011, pp. 28-34.
Luo ZX, Ruf I, Schultz JA, et al. Fossil evidence on evolution of inner ear cochlea in Jurassic mammals. Proc Biol Sci. 2011;278(1702):28-34.
Luo, Z. X., Ruf, I., Schultz, J. A., & Martin, T. (2011). Fossil evidence on evolution of inner ear cochlea in Jurassic mammals. Proceedings. Biological Sciences, 278(1702), 28-34. https://doi.org/10.1098/rspb.2010.1148
Luo ZX, et al. Fossil Evidence On Evolution of Inner Ear Cochlea in Jurassic Mammals. Proc Biol Sci. 2011 Jan 7;278(1702):28-34. PubMed PMID: 20667879.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fossil evidence on evolution of inner ear cochlea in Jurassic mammals. AU - Luo,Zhe-Xi, AU - Ruf,Irina, AU - Schultz,Julia A, AU - Martin,Thomas, Y1 - 2010/07/28/ PY - 2010/7/30/entrez PY - 2010/7/30/pubmed PY - 2011/3/3/medline SP - 28 EP - 34 JF - Proceedings. Biological sciences JO - Proc. Biol. Sci. VL - 278 IS - 1702 N2 - The coiled cochlea is a key evolutionary innovation of modern therian mammals. We report that the Late Jurassic mammal Dryolestes, a relative to modern therians, has derived bony characteristics of therian-like innervation, but its uncoiled cochlear canal is less derived than the coiled cochlea of modern therians. This suggests a therian-like innervation evolved before the fully coiled cochlea in phylogeny. The embryogenesis of the cochlear nerve and ganglion in the inner ear of mice is now known to be patterned by neurogenic genes, which we hypothesize to have influenced the formation of the auditory nerve and its ganglion in Jurassic therian evolution, as shown by their osteological correlates in Dryolestes, and by the similar base-to-apex progression in morphogenesis of the ganglion in mice, and in transformation of its canal in phylogeny. The cochlear innervation in Dryolestes is the precursory condition in the curve-to-coil transformation of the cochlea in mammalian phylogeny. This provides the timing of the evolution, and where along the phylogeny the morphogenetic genes were co-opted into patterning the cochlear innervation, and the full coiling of the cochlea in modern therians. SN - 1471-2954 UR - https://www.unboundmedicine.com/medline/citation/20667879/Fossil_evidence_on_evolution_of_inner_ear_cochlea_in_Jurassic_mammals_ L2 - https://royalsocietypublishing.org/doi/full/10.1098/rspb.2010.1148?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -