105 research outputs found

    Présence de Palaeoperdix media (Aves, Galliformes, Phasianidae) et d'autres oiseaux dans le MiocÚne du Portugal

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    A distal part of tibiotarsus from Charneca do Lumiar (Langhian, MN5) is identified as Palaeoperdix media, formerly known as Miophasianus medius. This species is thus known on a large area of the Palearctic province, from Portugal to Poland, and from the beginning of the Middle Miocene (MN 5) to the beginning of the Upper Miocene (MN9). An indeterminate, Gruid from Quinta das Pedreiras (Lower Langhian, MN4) and a few marine birds' remnants from Penedo Norte (Burdigalian) have been recognized

    The mammal localities of Grand Daoui quarries, Ouled Abdoun Basin, Morroco, Ypresian : a first survey

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    Nos recherches de terrain permettent de restituer le contexte gĂ©ologique et stratigraphique d’origine des localitĂ©s Ă  Phosphatherium escuilliei (Proboscidea) du bassin Ă  phosphates des Ouled Abdoun au Maroc. Le matĂ©riel de P. escuilliei et de plusieurs autres mammifĂšres provient des exploitations de Grand Daoui (NE du bassin). Nos observations montrent que leur niveau d’origine est un bone-bed situĂ© Ă  la base de l’Intercalaire Couche II/I datĂ© classiquement de l’YprĂ©sien infĂ©rieur. Ces niveaux du dĂ©but de l’EocĂšne marquent l’installation d’une nouvelle mĂ©gasĂ©quence dans la sĂ©rie phosphatĂ©e qui a partiellement remaniĂ© les niveaux sous-jacents du ThanĂ©tien. Cela explique la prĂ©sence de sĂ©laciens du ThanĂ©tien dans la gangue de P. escuilliei et sa datation initiale du PalĂ©ocĂšne. L’étude des sĂ©laciens associĂ©s au nouveau matĂ©riel mammalien rĂ©coltĂ© confirme l’ñge Ă©ocĂšne basal de P. escuilliei avec l’identification de plusieurs espĂšces de l’YprĂ©sien infĂ©rieur. La prĂ©sence exceptionnelle de mammifĂšres dans les Ouled Abdoun dĂ©note d’une taphonomie particuliĂšre des restes continentaux dans les dĂ©pĂŽts phosphatĂ©s. Ceux-ci ont Ă©tĂ© transportĂ©s dans le bassin depuis l’arriĂšre-pays continental proche dans des conditions de faible Ă©nergie hydrodynamique, probablement sous forme de cadavres flottĂ©s. Au total le matĂ©riel rĂ©coltĂ© dans les carriĂšres de Grand Daoui documente 7 espĂšces de mammifĂšres dont un crĂ©odonte, deux proboscidiens, deux « condylarthres », et deux espĂšces indĂ©terminĂ©es dĂ©crites ici. L’une est un des plus anciens hyracoĂŻdes signalĂ©s. P. escuilliei est trĂšs largement prĂ©dominant parmi ces mammifĂšres. La faune de vertĂ©brĂ©s qui leur est associĂ©e comprend des restes d’oiseaux signalĂ©s pour la premiĂšre fois dans les bassins Ă  phosphates d’Afrique. Ce sont les plus anciens oiseaux connus en Afrique et parmi les premiers reprĂ©sentants des groupes marins modernes

    Presumed Symbolic Use of Diurnal Raptors by Neanderthals

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    In Africa and western Eurasia, occurrences of burials and utilized ocher fragments during the late Middle and early Late Pleistocene are often considered evidence for the emergence of symbolically-mediated behavior. Perhaps less controversial for the study of human cognitive evolution are finds of marine shell beads and complex designs on organic and mineral artifacts in early modern human (EMH) assemblages conservatively dated to ≈100–60 kilo-years (ka) ago. Here we show that, in France, Neanderthals used skeletal parts of large diurnal raptors presumably for symbolic purposes at Combe-Grenal in a layer dated to marine isotope stage (MIS) 5b (≈90 ka) and at Les Fieux in stratigraphic units dated to the early/middle phase of MIS 3 (60–40 ka). The presence of similar objects in other Middle Paleolithic contexts in France and Italy suggest that raptors were used as means of symbolic expression by Neanderthals in these regions

    Phylogenetic Analysis of Pelecaniformes (Aves) Based on Osteological Data: Implications for Waterbird Phylogeny and Fossil Calibration Studies

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    ) were also assessed. The antiquity of these taxa and their purported status as stem members of extant families makes them valuable for studies of higher-level avian diversification. (sister taxon to Phalacrocoracidae). These relationships are invariant when ‘backbone’ constraints based on recent avian phylogenies are imposed.Relationships of extant pelecaniforms inferred from morphology are more congruent with molecular phylogenies than previously assumed, though notable conflicts remain. The phylogenetic position of the Plotopteridae implies that wing-propelled diving evolved independently in plotopterids and penguins, representing a remarkable case of convergent evolution. Despite robust support for the placement of fossil taxa representing key calibration points, the successive outgroup relationships of several “stem fossil + crown family” clades are variable and poorly supported across recent studies of avian phylogeny. Thus, the impact these fossils have on inferred patterns of temporal diversification depends heavily on the resolution of deep nodes in avian phylogeny

    Photography-based taxonomy is inadequate, unnecessary, and potentially harmful for biological sciences

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    The question whether taxonomic descriptions naming new animal species without type specimen(s) deposited in collections should be accepted for publication by scientific journals and allowed by the Code has already been discussed in Zootaxa (Dubois & NemĂ©sio 2007; Donegan 2008, 2009; NemĂ©sio 2009a–b; Dubois 2009; Gentile & Snell 2009; Minelli 2009; Cianferoni & Bartolozzi 2016; Amorim et al. 2016). This question was again raised in a letter supported by 35 signatories published in the journal Nature (Pape et al. 2016) on 15 September 2016. On 25 September 2016, the following rebuttal (strictly limited to 300 words as per the editorial rules of Nature) was submitted to Nature, which on 18 October 2016 refused to publish it. As we think this problem is a very important one for zoological taxonomy, this text is published here exactly as submitted to Nature, followed by the list of the 493 taxonomists and collection-based researchers who signed it in the short time span from 20 September to 6 October 2016

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