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A description of the molar enamel of a middle Miocene monotreme (Obdurodon, Ornithorhynchidae).
Anat Embryol (Berl). 1986; 174(2):145-51.AE

Abstract

The dentine and enamel of a newly discovered well-formed tooth of a Tertiary monotreme, Obdurodon sp., was examined for ultrastructural information relevant to the phylogenetic interpretation of monotremes. Obdurodon sp. presents a unique combination of mammalian structural features in the fractured enamel surfaces examined: tubules in great number; prisms of small diameter; a substantial and coherent inter-prismatic component and, in the middle third enamel, inter-row sheet; a simple non-decussating prism course; a predominantly pattern 1 prism packing in the innermost enamel; and a predominantly pattern 2 prism packing in the middle third enamel; and non-prismatic outer enamel. Although the particular combination of structural characteristics suggests that monotremes represent a possibly unique and relatively plesiomorphic group of mammals, many of the features are very similar to those seen in multituberculates. If multituberculates and monotremes are monophyletic, it would help to explain what has otherwise been a puzzling zoogeographic pattern in the distribution of each group.

Authors

Lester KS
No affiliation info available
Archer M
No affiliation info available

MeSH

AnimalsDental EnamelDentinMicroscopy, Electron, ScanningMolarMonotremataPhylogeny

Pub Type(s)

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

Language

eng

PubMed ID

3740449

Citation

Lester, K S., and M Archer. "A Description of the Molar Enamel of a Middle Miocene Monotreme (Obdurodon, Ornithorhynchidae)." Anatomy and Embryology, vol. 174, no. 2, 1986, pp. 145-51.
Lester KS, Archer M. A description of the molar enamel of a middle Miocene monotreme (Obdurodon, Ornithorhynchidae). Anat Embryol (Berl). 1986;174(2):145-51.
Lester, K. S., & Archer, M. (1986). A description of the molar enamel of a middle Miocene monotreme (Obdurodon, Ornithorhynchidae). Anatomy and Embryology, 174(2), 145-51.
Lester KS, Archer M. A Description of the Molar Enamel of a Middle Miocene Monotreme (Obdurodon, Ornithorhynchidae). Anat Embryol (Berl). 1986;174(2):145-51. PubMed PMID: 3740449.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A description of the molar enamel of a middle Miocene monotreme (Obdurodon, Ornithorhynchidae). AU - Lester,K S, AU - Archer,M, PY - 1986/1/1/pubmed PY - 1986/1/1/medline PY - 1986/1/1/entrez SP - 145 EP - 51 JF - Anatomy and embryology JO - Anat Embryol (Berl) VL - 174 IS - 2 N2 - The dentine and enamel of a newly discovered well-formed tooth of a Tertiary monotreme, Obdurodon sp., was examined for ultrastructural information relevant to the phylogenetic interpretation of monotremes. Obdurodon sp. presents a unique combination of mammalian structural features in the fractured enamel surfaces examined: tubules in great number; prisms of small diameter; a substantial and coherent inter-prismatic component and, in the middle third enamel, inter-row sheet; a simple non-decussating prism course; a predominantly pattern 1 prism packing in the innermost enamel; and a predominantly pattern 2 prism packing in the middle third enamel; and non-prismatic outer enamel. Although the particular combination of structural characteristics suggests that monotremes represent a possibly unique and relatively plesiomorphic group of mammals, many of the features are very similar to those seen in multituberculates. If multituberculates and monotremes are monophyletic, it would help to explain what has otherwise been a puzzling zoogeographic pattern in the distribution of each group. SN - 0340-2061 UR - https://www.unboundmedicine.com/medline/citation/3740449/A_description_of_the_molar_enamel_of_a_middle_Miocene_monotreme__Obdurodon_Ornithorhynchidae__ DB - PRIME DP - Unbound Medicine ER -