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1980-10
Vol. 9, Ext
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Print ISSN: 0031-0247
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PalaeoVertebrata Vol. 9, Ext
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Article

Functional aspects of the evolution of rodent molars
Percy M. Butler
Published online: 01/10/1980

Keywords: Chewing; Muridae; Rodents; Wear facets

https://doi.org/10.18563/pv.9.ext.249-262

References: 11

Cite this article: Percy M. Butler, 1980. Functional aspects of the evolution of rodent molars. PalaeoVertebrata 9 (ext): 249-262. doi: 10.18563/pv.9.ext.249-262

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Abstract

The wear facets of primitive rodents can be homologized with those of primitive primates and ungulates. As in primates, the jaw movement was ectental, with an increased anterior component in the lingual phase (phase ll). The buccal phase (phase I) in rodents approaches the horizontal and it tends to be reduced in importance in comparison with the lingual phase. ln more advanced rodents the efficiency of grinding is increased by the development of additional cutting edges of enamel (e.g. enlargement of hypocone, development of mesoloph and lingual sinus). The buccal phase movement becomes lined up with the lingual phase movement to form a single oblique chewing stroke,resulting in planation of the crown. As the stroke becomes more longitudinal (propalinal) the enamel edges become more transverse. In Muridae propalinal chewing evolved before the loss of cusps, facets were reorientated and additional cusps developed. 



Published in Vol. 9, Ext (1980)

References

BUTLER P.M., 1952. — The milk-molars of Perissodactyla, with remarks on molar occlusion. Proc. zool. Soc. Lond., 121, p. 777-817, 16 figs. https://doi.org/10.1111/j.1096-3642.1952.tb00784.x

BUTLER P.M., 1961. — Relationships between upper and lower molar patterns. Internat. Colloq. on the Evolution of Mammals. Kon. Vlaamse Acad. Wetens. Lett. sch. Kun. Belgic, Brussels 1961. Part I, p. 117-126, 4 figs.

BUTLER P.M., 1973. — Molar wear facets of Tertiary North American primates. Craniofacial Biology of Primates, Vol. 3 (M.R. Zingeser, ed.). Symp. 4th internat. Congr. Primatol., Karger, Basel, p. 1-27, 12 figs.

GREAVES W.S., 1970. — The inference of jaw movement from tooth wear facets. J. Paleont., 47, p. 1000-1001, 1 fig.

HERSHKOVITZ F., 1967. — Dynamics of rodent molar evolution: a study based on New World Cricetinae, family Muridae. J. dent. Res., 46, p. 829-842, 8 figs. https://doi.org/10.1177/00220345670460053701

KAY R.F. and HIIEMAE, K.M., 1974. — Jaw movement and tooth use in Recent and fossil primates. Amer. J. phys. Anthrop., 40, p. 227-256, 18 figs. https://doi.org/10.1002/ajpa.1330400210

LAVOCAT R., 1973. — Les rongeurs du Miocène d'Afrique Orientale. 1. Miocène Inférieur. Mém. trav. E.P.H.E., Inst. Montpellier, 1, p. 1-284, 44 pl., 20 figs.

MILLS J.R.E., 1965. — Ideal dental occlusion in the primates. Dent. Practit., 6, p. 47-61, 17 figs.

PETTER F., 1966. — L'origine des Muridés. Plan cricétin et plans murins. Mammalia, 30, p. 205-225, 13 figs. https://doi.org/10.1515/mamm.1966.30.2.205

RENSBERGER J.M., 1973. — An occlusal model for mastication and dental wear in herbivorous mammals. J. Paleontol., 47, p. 515-528, 1 pl., 13 figs.

RENSBERGER J.M., 1975. — Function in the cheek tooth evolution of some hypsodont geomyoid rodents. J. Paleontol., 49, p. 10-22, 4 figs. 
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