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A Jurassic mammaliaform and the earliest mammalian evolutionary adaptations.
Nature. 2013 Aug 08; 500(7461):163-7.Nat

Abstract

The earliest evolution of mammals and origins of mammalian features can be traced to the mammaliaforms of the Triassic and Jurassic periods that are extinct relatives to living mammals. Here we describe a new fossil from the Middle Jurassic that has a mandibular middle ear, a gradational transition of thoracolumbar vertebrae and primitive ankle features, but highly derived molars with a high crown and multiple roots that are partially fused. The upper molars have longitudinal cusp rows that occlude alternately with those of the lower molars. This specialization for masticating plants indicates that herbivory evolved among mammaliaforms, before the rise of crown mammals. The new species shares the distinctive dental features of the eleutherodontid clade, previously represented only by isolated teeth despite its extensive geographic distribution during the Jurassic. This eleutherodontid was terrestrial and had ambulatory gaits, analogous to extant terrestrial mammals such as armadillos or rock hyrax. Its fur corroborates that mammalian integument had originated well before the common ancestor of living mammals.

Authors+Show Affiliations

Paleontological Museum of Liaoning, Shenyang Normal University, Shenyang, Liaoning 110034, China.No 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

23925238

Citation

Zhou, Chang-Fu, et al. "A Jurassic Mammaliaform and the Earliest Mammalian Evolutionary Adaptations." Nature, vol. 500, no. 7461, 2013, pp. 163-7.
Zhou CF, Wu S, Martin T, et al. A Jurassic mammaliaform and the earliest mammalian evolutionary adaptations. Nature. 2013;500(7461):163-7.
Zhou, C. F., Wu, S., Martin, T., & Luo, Z. X. (2013). A Jurassic mammaliaform and the earliest mammalian evolutionary adaptations. Nature, 500(7461), 163-7. https://doi.org/10.1038/nature12429
Zhou CF, et al. A Jurassic Mammaliaform and the Earliest Mammalian Evolutionary Adaptations. Nature. 2013 Aug 8;500(7461):163-7. PubMed PMID: 23925238.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A Jurassic mammaliaform and the earliest mammalian evolutionary adaptations. AU - Zhou,Chang-Fu, AU - Wu,Shaoyuan, AU - Martin,Thomas, AU - Luo,Zhe-Xi, PY - 2013/05/14/received PY - 2013/07/04/accepted PY - 2013/8/9/entrez PY - 2013/8/9/pubmed PY - 2013/8/21/medline SP - 163 EP - 7 JF - Nature JO - Nature VL - 500 IS - 7461 N2 - The earliest evolution of mammals and origins of mammalian features can be traced to the mammaliaforms of the Triassic and Jurassic periods that are extinct relatives to living mammals. Here we describe a new fossil from the Middle Jurassic that has a mandibular middle ear, a gradational transition of thoracolumbar vertebrae and primitive ankle features, but highly derived molars with a high crown and multiple roots that are partially fused. The upper molars have longitudinal cusp rows that occlude alternately with those of the lower molars. This specialization for masticating plants indicates that herbivory evolved among mammaliaforms, before the rise of crown mammals. The new species shares the distinctive dental features of the eleutherodontid clade, previously represented only by isolated teeth despite its extensive geographic distribution during the Jurassic. This eleutherodontid was terrestrial and had ambulatory gaits, analogous to extant terrestrial mammals such as armadillos or rock hyrax. Its fur corroborates that mammalian integument had originated well before the common ancestor of living mammals. SN - 1476-4687 UR - https://www.unboundmedicine.com/medline/citation/23925238/A_Jurassic_mammaliaform_and_the_earliest_mammalian_evolutionary_adaptations_ L2 - https://doi.org/10.1038/nature12429 DB - PRIME DP - Unbound Medicine ER -