The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Fengtang Yang - One of the best experts on this subject based on the ideXlab platform.
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flying lemurs the flying tree shrews molecular cytogenetic evidence for a scandentia Dermoptera sister clade
BMC Biology, 2008Co-Authors: Beiyuan Fu, Patricia C M Obrien, Jinhuan Wang, Weiting Su, Alongkoad Tanomtong, V Volobouev, Malcolm A Fergusonsmith, Fengtang YangAbstract:Background Flying lemurs or Colugos (order Dermoptera) represent an ancient mammalian lineage that contains only two extant species. Although molecular evidence strongly supports that the orders Dermoptera, Scandentia, Lagomorpha, Rodentia and Primates form a superordinal clade called Supraprimates (or Euarchontoglires), the phylogenetic placement of Dermoptera within Supraprimates remains ambiguous.
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Flying lemurs – The 'flying tree shrews'? Molecular cytogenetic evidence for a Scandentia-Dermoptera sister clade
BMC Biology, 2008Co-Authors: Beiyuan Fu, Jinhuan Wang, Weiting Su, Alongkoad Tanomtong, V Volobouev, Patricia C. M. O’brien, Malcolm A. Ferguson-smith, Fengtang YangAbstract:Background Flying lemurs or Colugos (order Dermoptera) represent an ancient mammalian lineage that contains only two extant species. Although molecular evidence strongly supports that the orders Dermoptera, Scandentia, Lagomorpha, Rodentia and Primates form a superordinal clade called Supraprimates (or Euarchontoglires), the phylogenetic placement of Dermoptera within Supraprimates remains ambiguous.
Eric J. Sargis - One of the best experts on this subject based on the ideXlab platform.
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New Paleocene skeletons and the relationship of plesiadapiforms to crown-clade primates
Proceedings of the National Academy of Sciences of the United States of America, 2007Co-Authors: Jonathan I. Bloch, Mary T. Silcox, Doug M. Boyer, Eric J. SargisAbstract:Plesiadapiforms are central to studies of the origin and evolution of primates and other euarchontan mammals (tree shrews and flying lemurs). We report results from a comprehensive cladistic analysis using cranial, postcranial, and dental evidence including data from recently discovered Paleocene plesiadapiform skeletons (Ignacius clarkforkensis sp. nov.; Dryomomys szalayi, gen. et sp. nov.), and the most plesiomorphic extant tree shrew, Ptilocercus lowii. Our results, based on the fossil record, unambiguously place plesiadapiforms with Euprimates and indicate that the divergence of Primates (sensu lato) from other euarchontans likely occurred before or just after the Cretaceous/Tertiary boundary (65 Mya), notably later than logistical model and molecular estimates. Anatomical features associated with specialized pedal grasping (including a nail on the hallux) and a petrosal bulla likely evolved in the common ancestor of Plesiadapoidea and Euprimates (Euprimateformes) by 62 Mya in either Asia or North America. Our results are consistent with those from recent molecular analyses that group Dermoptera with Scandentia. We find no evidence to support the hypothesis that any plesiadapiforms were mitten-gliders or closely related to Dermoptera.
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New views on tree shrews: The role of Tupaiids in primate supraordinal relationships
Evolutionary Anthropology, 2004Co-Authors: Eric J. SargisAbstract:Although tree shrews are still regarded as close relatives of primates, their precise phylogenetic relationships are not clear. Both taxa are frequently included with flying lemurs (Dermoptera) and bats (Chiroptera) in the supraordinal grouping Archonta, assignments that are supported by morphological data.12–18 Molecular studies support a clade uniting tree shrews and primates with flying lemurs, to the exclusion of bats; this group is called Euarchonta.19 Within Archonta or Euarchonta, both tree shrews20,21 and flying lemurs22 have been proposed to be the closest relatives of primates, though more recent studies have shown that tree shrews may in fact be more closely related to flying lemurs than either is to Primates19,23–25 (see Sargis25 for a detailed history of the relationships of archontans and a review of morphological and molecular studies). Whether or not tree shrews are the sister taxon to Primates, they are still crucial to primate supraordinal relationships and represent a critical outgroup in studies of primate phylogenetics.4 The goal of this paper is to summarize recent research that has improved our understanding of tree shrews and their relationships to primates and other mammals.
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The Postcranial Morphology of Ptilocercus lowii (Scandentia, Tupaiidae): An Analysis of Primatomorphan and Volitantian Characters
Journal of Mammalian Evolution, 2002Co-Authors: Eric J. SargisAbstract:The eutherian orders Scandentia, Primates, Dermoptera, and Chiroptera have been grouped together by many morphologists, using various methods and data sets, into the cohort Archonta. Molecular evidence, however, has supported a clade (called Euarchonta) that includes Scandentia, Primates, and Dermoptera, but not Chiroptera. Within Archonta, some systematists have grouped Dermoptera and Chiroptera in Volitantia, while others have grouped Dermoptera and Primates in Primatomorpha. The order Scandentia includes the single family Tupaiidae, with two subfamilies, Ptilocercinae and Tupaiinae. Ptilocercinae is represented only by Ptilocercus lowii , which has been said to be the taxon most closely approximating the ancestral tupaiid. However, most researchers working on archontan phylogeny typically do not treat the order Scandentia as being polymorphic. They usually use Tupaia to represent Scandentia, despite the fact that Ptilocercus is quite distinct from Tupaia and has been argued to be the more plesiomorphic of the two taxa. In this study, a character analysis was performed on postcranial features that have been used to support the competing Primatomorpha and Volitantia hypotheses. In recognition of the polymorphic nature of Scandentia, taxonomic sampling within Scandentia was increased to include Ptilocercus . The postcranium of Ptilocercus was compared to that of tupaiines, euprimates, plesiadapiforms, Dermopterans, and chiropterans. Several character states used to support either Primatomorpha or Volitantia, while not found in Tupaia , were found in Ptilocercus . While these features may have evolved independently in Ptilocercus , it is perhaps more likely that they represent features that first evolved in the ancestral archontan and were then lost in one of the extant orders. This character analysis greatly reduces the supportive evidence for the Primatomorpha hypothesis.
Beiyuan Fu - One of the best experts on this subject based on the ideXlab platform.
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flying lemurs the flying tree shrews molecular cytogenetic evidence for a scandentia Dermoptera sister clade
BMC Biology, 2008Co-Authors: Beiyuan Fu, Patricia C M Obrien, Jinhuan Wang, Weiting Su, Alongkoad Tanomtong, V Volobouev, Malcolm A Fergusonsmith, Fengtang YangAbstract:Background Flying lemurs or Colugos (order Dermoptera) represent an ancient mammalian lineage that contains only two extant species. Although molecular evidence strongly supports that the orders Dermoptera, Scandentia, Lagomorpha, Rodentia and Primates form a superordinal clade called Supraprimates (or Euarchontoglires), the phylogenetic placement of Dermoptera within Supraprimates remains ambiguous.
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Flying lemurs – The 'flying tree shrews'? Molecular cytogenetic evidence for a Scandentia-Dermoptera sister clade
BMC Biology, 2008Co-Authors: Beiyuan Fu, Jinhuan Wang, Weiting Su, Alongkoad Tanomtong, V Volobouev, Patricia C. M. O’brien, Malcolm A. Ferguson-smith, Fengtang YangAbstract:Background Flying lemurs or Colugos (order Dermoptera) represent an ancient mammalian lineage that contains only two extant species. Although molecular evidence strongly supports that the orders Dermoptera, Scandentia, Lagomorpha, Rodentia and Primates form a superordinal clade called Supraprimates (or Euarchontoglires), the phylogenetic placement of Dermoptera within Supraprimates remains ambiguous.
J R Wible - One of the best experts on this subject based on the ideXlab platform.
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On the Treeshrew Skull (Mammalia, Placentalia, Scandentia)
Annals of Carnegie Museum, 2011Co-Authors: J R WibleAbstract:ABSTRACT Skull anatomy other than the ear region of the pen-tailed treeshrew, Ptilocercus lowii Gray, 1848 (Ptilocercidae), is described and illustrated in detail based on 11 specimens from the Carnegie Museum of Natural History and the United States National Museum. Comparisons are made to the common treeshrew, Tupaia glis (Diard, 1820) (Tupaiidae), in a manner similar to the author's treatment of the ear region (Wible 2009). Included are bone by bone treatment of the external surfaces of the skull and hyoid apparatus, and composite treatment of the endocranium for P. lowii with comparisons to an uncertain species of Tupaia Raffles, 1821, and T. glis. The principal cranial foramina and their contents are addressed. Treeshrews are members of the placental order Scandentia, which is nested within the higher-level clade Euarchonta, along with the order Primates and the order Dermoptera (colugos). Relationships among these three orders are controversial in recent molecular studies, and detailed morphological...
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observations on the vomeronasal organ of the colugo cynocephalus mammalia Dermoptera
Cells Tissues Organs, 1994Co-Authors: Kunwar P Bhatnagar, J R WibleAbstract:This paper presents the first description of a functional vomeronasal organ in the colugo or ‘flying lemur’ Cynocephalus , the sole living representative of the order Dermoptera (Mam
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cranial circulation andrelationships ofthe colugo cynocephalus Dermoptera mammalia
1993Co-Authors: J R WibleAbstract:Thesuperordinal relationships oftheextant colugoCynocephalus currently arethesubject ofcontroversy, withconflicting hypotheses derived from skeletal, neuroanatomical, andbiochemical analyses. Toevaluate these hypotheses, thecranial circulation wasinvestigated inserially sectioned prenatal andjuvenile colugos. Thecranial vascular pattern andassociated osseous features haveplayed acrucial roleinassessing higher-level relationships amongmammalsandheretofore havenot beendescribed indetail forthecolugo. Cynocephalus exhibits oneofthemosthighly derived cranial vascular patterns amongeutherians.Theinternal carotid andstapedial arteries are lacking, withtheir terminal branches annexed to thecerebral circulation andexternal carotid. Situatedinthebackoftheorbit andextending intracranially into thecavernous sinus isaretemirabile thatisconnected withtheexternal carotid system viamultiple channels (intra- andextracranial). Asimportant conduits forthedural sinuses, there areawell-developed sinus communicans and venadiploetica magna; apostglenoid veinandforamenarewholly absent. Derived features ofthecranial circulation are shared between thecolugo andavariety ofeutherian groups (e.g., bats, euprimates, lagomorphs, artiodactyls) andbythemselves support several different placements forDermoptera. Onamore definitive note, noconvincing derived features of thecranial circulation wereidentified allying colugos withearly Tertiary plagiomenids orarchaic primates.
V Volobouev - One of the best experts on this subject based on the ideXlab platform.
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flying lemurs the flying tree shrews molecular cytogenetic evidence for a scandentia Dermoptera sister clade
BMC Biology, 2008Co-Authors: Beiyuan Fu, Patricia C M Obrien, Jinhuan Wang, Weiting Su, Alongkoad Tanomtong, V Volobouev, Malcolm A Fergusonsmith, Fengtang YangAbstract:Background Flying lemurs or Colugos (order Dermoptera) represent an ancient mammalian lineage that contains only two extant species. Although molecular evidence strongly supports that the orders Dermoptera, Scandentia, Lagomorpha, Rodentia and Primates form a superordinal clade called Supraprimates (or Euarchontoglires), the phylogenetic placement of Dermoptera within Supraprimates remains ambiguous.
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Flying lemurs – The 'flying tree shrews'? Molecular cytogenetic evidence for a Scandentia-Dermoptera sister clade
BMC Biology, 2008Co-Authors: Beiyuan Fu, Jinhuan Wang, Weiting Su, Alongkoad Tanomtong, V Volobouev, Patricia C. M. O’brien, Malcolm A. Ferguson-smith, Fengtang YangAbstract:Background Flying lemurs or Colugos (order Dermoptera) represent an ancient mammalian lineage that contains only two extant species. Although molecular evidence strongly supports that the orders Dermoptera, Scandentia, Lagomorpha, Rodentia and Primates form a superordinal clade called Supraprimates (or Euarchontoglires), the phylogenetic placement of Dermoptera within Supraprimates remains ambiguous.