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  • 1
    Electronic Resource
    Electronic Resource
    FLIPPERS AND PINNIPED PHYLOGENY: HAS THE PROBLEM OF CONVERGENCE BEEN OVERRATED? (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 5 (1989), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The phylogenetic relationships of the major groups of pinnipeds are of longstanding controversy. According to prevailing paleontological opinion, pinnipeds comprise two distinct lineages of independent terrestrial carnivoran origin, A logical correlate of this view is that an enormous degree of convergence accounts for the striking resemblances of these groups.It has been generally supposed that derived similarities common to pinnipeds are independently acquired adaptations to a highly constraining environment. This has not been adequately substantiated. Moreover, considerable evidence favors a contrary conclusion. Acceptance of convergence necessarily rests on demonstration that taxa possessing characters suspected to be convergent are in fact not mutal nearest allies. In the absence of such phylogenetic information, shared derived characters are indicative of common ancestry irrespective of whether they are deemed “functionally important.” Given meager support for the proposition that pinnipeds are related to different terrestrial lineages, it is currently more judicious to regard the group's origin as monophyletic. In addition to the presumed prevalence of convergence, biogeography, the high degree of morphological divergence of phocids, and the aberrant nature of phocines have improperly contributed to acceptance of independent pinniped origins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.1989.tb00347.x
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  • 2
    Electronic Resource
    Electronic Resource
    A Middle Jurassic mammal from Madagascar (1999)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 401 (1999), S. 57-60 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The lower molars of tribosphenic mammals (marsupials, placentals and their extinct allies) are marked, primitively, by a basined heel (talonid) acting as the mortar to the pestle of a large inner cusp (protocone) on the opposing upper teeth. Here we report the earliest tribosphenic mammal found ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/43420
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  • 3
    Electronic Resource
    Electronic Resource
    Multituberculate and other mammal hair recovered from Palaeogene excreta (1997)
    [s.l.] : Nature Publishing Group
    Nature 385 (1997), S. 712-714 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Mammalian faeces and bird pellets are usually rare, isolated occurrences in the pre-Pleistocene palaeontological record3'4, as is the preservation of soft tissue such as hair5. We have examined a rich accumulation of hair-containing coprolites and regurgitalites (Fig. 1), an unprecedented datum in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/385712a0
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  • 4
    Electronic Resource
    Electronic Resource
    Enamel microstructure ofTribosphenomys (Mammalia, glires): Character analysis and systematic implications (1994)
    Springer
    Journal of mammalian evolution 2 (1994), S. 185-203 
    Details
    ISSN: 1573-7055
    Keywords: enamel microstructure ; Tribosphenomys, Rodentia, taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Enamel distribution on the upper and lower incisors ofTribosphenomys minutus (from Late Paleocene-Early Eocene of Inner Mongolia of China) is typically rodent-like, i.e., primarily confined to the anterior surface throughout these transversely compressed, evergrowing teeth. AlthoughTribosphenomys incisor enamel is differentiated into two layers, it does not possess Hunter-Schreger bands (HSB). The incisor and molar enamels are radial in type, a condition regarded as either an autapomorph or a primtive retention forTribosphenomys. Character polarities concerning enamel thickness, enamel layer number, HSB, enamel types, and functional and phylogenetic implications of the enamel structures are discussed. Overall, enamel microstructural evolution at high taxonomic levels within Glires displays considerably more homoplasy than generally appreciated. A phylogenetic definition of Rodentia is proposed.Tribosphenomys is the sister-group of a taxon here named “Rodentia,” and thus is not itself a member of the order, from a systematic viewpoint.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01473528
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  • 5
    Electronic Resource
    Electronic Resource
    Evidence from flipper structure for a single origin of pinnipeds (1988)
    [s.l.] : Nature Publishing Group
    Nature 334 (1988), S. 427-428 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Somewhat anomalously, flippers (structures well marked enough to lend pinnipeds their name) have scarcely been examined in a phylogenetic context. This lack of attention stems from a common misperception that organs of propulsion and other specializations clearly associated with an aquatic habitat ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/334427a0
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  • 6
    Electronic Resource
    Electronic Resource
    South America's earliest rodent and recognition of a new interval of mammalian evolution (1993)
    [s.l.] : Nature Publishing Group
    Nature 365 (1993), S. 434-437 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A diverse Palaeogene mammal fauna (〉400 specimens) (Table 1) is the result of five seasons of fieldwork in the Tinguiririca River valley, near Termas del Flaco, (34á° 59' S, 70á° 26' W) cen-tral Chile. This Tinguiririca Fauna derives from volcaniclastic sediments ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/365434a0
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  • 7
    Electronic Resource
    Electronic Resource
    Multituberculate phylogeny (1996)
    [s.l.] : Nature Publishing Group
    Nature 379 (1996), S. 407-407 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MENG AND WYSS REPLY - Rougier et al.'s underlying objection stems from a misperception that our paper2 and its comments concerning the placement of multituberculates was intended as an exhaustive phylogenetic analysis of the major groups of mammals. The aim of our presentation of new anatomical ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/379407a0
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  • 8
    Electronic Resource
    Electronic Resource
    Primitive fossil rodent from Inner Mongolia and its implications for mammalian phylogeny (1994)
    [s.l.] : Nature Publishing Group
    Nature 370 (1994), S. 134-136 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Cohort Glires Linnaeus, 1758 Order Rodentia Bowdich, 1821 Superfamily incertae sedis, Family ?alagomyidae Dashzeveg, 1990 Tribosphenomys minutus gen. et sp. nov. Etymology. Tribosphen, Greek, meaning grind and wedge, in reference to its primitive, triangular crown pattern; mys, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/370134a0
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  • 9
    Electronic Resource
    Electronic Resource
    An Early Miocene anthropoid skull from the Chilean Andes (1995)
    [s.l.] : Nature Publishing Group
    Nature 373 (1995), S. 603-607 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fossil mammals from the Chilean Andes have come to light only recently. Our previous work6 in high-elevation volcaniclastic deposits of the Abanico (Coya-Machali) Formation near Termas del Flaco (35° S) produced two Palaeogene fossil mammal faunas, the first significant palaeontological ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/373603a0
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  • 10
    Electronic Resource
    Electronic Resource
    Monotreme affinities and low-frequency hearing suggested by multituberculate ear (1995)
    [s.l.] : Nature Publishing Group
    Nature 377 (1995), S. 141-144 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The triossicular mammalina middle ear transmits vibrations from the tympanic membrane (eardrum), supported by the ectotympanic bone, to the inner ear. Recognition that the mammalian auditory ossicles are transformed lower jaw and jaw suspensory elements of other gnathostomes represents a classic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/377141a0
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