Tags

Type your tag names separated by a space and hit enter

A new symmetrodont mammal from China and its implications for mammalian evolution.
Nature. 1997 Nov 13; 390(6656):137-42.Nat

Abstract

A new symmetrodont mammal has been discovered in the Mesozoic era (Late Jurassic or Early Cretaceous period) of Liaoning Province, China. Archaic therian mammals, including symmetrodonts, are extinct relatives of the living marsupial and placental therians. However, these archaic therians have been mostly documented by fragmentary fossils. This newfossil taxon, represented by a nearly complete postcranial skeleton and a partial skull with dentition, is the best-preserved symmetrodont mammal yet discovered. It provides a new insight into the relationships of the major lineages of mammals and the evolution of the mammalian skeleton. Our analysis suggests that this new taxon represents a part of the early therian radiation before the divergence of living marsupials and placentals; that therians and multituberculates are more closely related to each other than either group is to other mammalian lineages; that archaic therians lacked the more parasagittal posture of the forelimb of most living therian mammals; and that archaic therians, such as symmetrodonts, retained the primitive feature of a finger-like promontorium (possibly with a straight cochlea) of the non-therian mammals. The fully coiled cochlea evolved later in more derived therian mammals, and is therefore convergent to the partially coiled cochlea of monotremes.

Authors+Show Affiliations

Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing.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

9367151

Citation

Hu, Y, et al. "A New Symmetrodont Mammal From China and Its Implications for Mammalian Evolution." Nature, vol. 390, no. 6656, 1997, pp. 137-42.
Hu Y, Wang Y, Luo Z, et al. A new symmetrodont mammal from China and its implications for mammalian evolution. Nature. 1997;390(6656):137-42.
Hu, Y., Wang, Y., Luo, Z., & Li, C. (1997). A new symmetrodont mammal from China and its implications for mammalian evolution. Nature, 390(6656), 137-42.
Hu Y, et al. A New Symmetrodont Mammal From China and Its Implications for Mammalian Evolution. Nature. 1997 Nov 13;390(6656):137-42. PubMed PMID: 9367151.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A new symmetrodont mammal from China and its implications for mammalian evolution. AU - Hu,Y, AU - Wang,Y, AU - Luo,Z, AU - Li,C, PY - 1997/11/21/pubmed PY - 2001/3/23/medline PY - 1997/11/21/entrez SP - 137 EP - 42 JF - Nature JO - Nature VL - 390 IS - 6656 N2 - A new symmetrodont mammal has been discovered in the Mesozoic era (Late Jurassic or Early Cretaceous period) of Liaoning Province, China. Archaic therian mammals, including symmetrodonts, are extinct relatives of the living marsupial and placental therians. However, these archaic therians have been mostly documented by fragmentary fossils. This newfossil taxon, represented by a nearly complete postcranial skeleton and a partial skull with dentition, is the best-preserved symmetrodont mammal yet discovered. It provides a new insight into the relationships of the major lineages of mammals and the evolution of the mammalian skeleton. Our analysis suggests that this new taxon represents a part of the early therian radiation before the divergence of living marsupials and placentals; that therians and multituberculates are more closely related to each other than either group is to other mammalian lineages; that archaic therians lacked the more parasagittal posture of the forelimb of most living therian mammals; and that archaic therians, such as symmetrodonts, retained the primitive feature of a finger-like promontorium (possibly with a straight cochlea) of the non-therian mammals. The fully coiled cochlea evolved later in more derived therian mammals, and is therefore convergent to the partially coiled cochlea of monotremes. SN - 0028-0836 UR - https://www.unboundmedicine.com/medline/citation/9367151/A_new_symmetrodont_mammal_from_China_and_its_implications_for_mammalian_evolution_ L2 - https://doi.org/10.1038/36505 DB - PRIME DP - Unbound Medicine ER -