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  • evolution  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Early rodent incisor enamel evolution: Phylogenetic implications (1993)
    Springer
    Journal of mammalian evolution 1 (1993), S. 227-254 
    Details
    ISSN: 1573-7055
    Keywords: enamel microstructure ; evolution ; incisors ; Mixodontia ; Rodentia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Incisor enamel microstructure proved to be a very effective tool for assessment of phylogenetic relationships among the Rodentia. Pauciserial and multiserial Schmelzmuster are clearly distinct by structural characters such as orientation of interprismatic matrix, presence or absence of transition zones between Hunter-Schreger bands (HSB), inclination of HSB, enamel thickness, and others. Pauciserial HSB are structurally very close to the earliest known mammalian HSB found in Paleocene arctocyonids. Biomechanical arguments and outgroup comparison with mixodontians indicate that the pauciserial Schmelzmuster is a symplesiomorphy of the Rodentia. Transitional stages from pauciserial to multiserial Schmelzmuster were observed in middle Eocene ctenodactyloids and from pauciserial to uniserial in middle to late Eocene anomalurids. The multiserial Schmelzmuster is considered a synapomorphy of the Hystricognathi, ctenodactylids, and pedetids. Schmelzmuster evolution reflects the early dichotomy of the Rodentia: In the Asian ctenodactyloid lineage a multiserial Schmelzmuster evolved once and in the North American/European ischyromyoid lineage a uniserial Schmelzmuster developed several times convergently. The pauci- to uniserial Schmelzmuster of the anomalurids excludes a close relationship to the phiomyids, because the ctenodactyloid-phiomyid lineage is characterized by the development of a multiserial Schmelzmuster.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01041665
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the systematic position ofChaetomys subspinosus (Rodentia: Caviomorpha) based on evidence from the incisor enamel microstructure (1994)
    Springer
    Journal of mammalian evolution 2 (1994), S. 117-131 
    Details
    ISSN: 1573-7055
    Keywords: enamel microstructure ; evolution ; Chaetomys ; incisors ; Caviomorpha
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have studied the incisor enamel microstructure ofChaetomys subspinosus and other possibly closely related caviomorph rodents.Chaetomys subspinosus lacks the important synapomorphy of the Octodontoidea, reactangular plate-like interprismatic matrix (IPM) in the portio interna (PI) of the incisor Schmelzmuster. Therefore its transfer from the Erethizontidae to the Echimyidae, as proposed by Patterson and Wood (Bull. Mus. Comp. Zool. 149, 371–543, 1982) based on retention of dP4, is contested. The parallel to acute angular IPM in the PI ofChaetomys and the Erethizontidae is a symplesiomorphy and does not indicate close relationship. Contrary to previous claims, a posterior carotid foramen is also retained inChaetomys. Chaetomys is characterized by an unusual thin enamel which is considered primitive after outgroup comparison. Therefore, it is proposed to leaveChaetomys in the monospecific erethizontid subfamily Chaetomyinae, until additional information on the species is available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01464364
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    Paper (German National Licenses)
    Fulltext
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