Scanning electron microscopy of molar enamel structure of cricetodontine neogene rodents.
Ultrastructural characters of enamel were studied as a phylogenetic indicator in a family of rodent fossils: the Cricetidae. The extinct group Cricetodon-Ruscinomys is a known lineage which span 17 million of years (from -20 My to -3 My). The three-dimensional organization of enamel of the left M1 was studied in 8 cricetid species at three different levels: (1) the chewing surface; (2) the middle of the crown; (3) the cervical part, close to the root. The arrangement and other details of enamel prisms varied according to five factors: (1) tooth morphology (there were differences between the four faces of the same molar); (2) enamel thickness; (3) level of crown; (4) degree of hypsodonty; (5) chronological age of the extinct species.
Rodde
J
J
U.F.R. d'Odontologie, rue Guillaume Paradin, Lyon, France.
Mein
P
P
D000818:Animals; D003411:Arvicolinae / Q000033:anatomy & histology*; D003743:Dental Enamel / Q000648:ultrastructure*; D005580:Fossils; D049690:History, Ancient; D008855:Microscopy, Electron, Scanning; D010161:Paleodontology; D010163:Paleontology; D010802:Phylogeny