Results 151 to 160 of about 1,128 (190)
A Silurian placoderm with osteichthyan-like marginal jaw bones
Nature, 2013 The gnathostome (jawed vertebrate) crown group comprises two extant clades with contrasting character complements. Notably, Chondrichthyes (cartilaginous fish) lack the large dermal bones that characterize Osteichthyes (bony fish and tetrapods). The polarities of these differences, and the morphology of the last common ancestor of crown gnathostomes ...
Min Zhu, Xiaobo Yu, Brian Choo
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Devonian placoderm scales from Australia
Journal of Vertebrate Paleontology, 1998The morphology and histology of Australian placoderm scales which were found associated with dermal plates are described and compared. The specimens include the arthrodire Buchanosteus confertituberculatus from the Early Devonian (Emsian) of Buchan, Victoria, the arthrodires Goodradigbeeon australianium and Buchanosteidae gen. et sp.
Burrow C.J., Turner S.
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Current Biology
For over 70 million years, during the Paleozoic, the placoderms (Greek for 'plated skin'), an extinct group of armoured fishes, were the most abundant and diverse vertebrates on our planet. Some of the first placoderm fossils discovered - such as Bothriolepis with its bone-covered pectoral fins - seemed so bizarre that they were thought to represent ...
John A, Long, Kate, Trinajstic
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For over 70 million years, during the Paleozoic, the placoderms (Greek for 'plated skin'), an extinct group of armoured fishes, were the most abundant and diverse vertebrates on our planet. Some of the first placoderm fossils discovered - such as Bothriolepis with its bone-covered pectoral fins - seemed so bizarre that they were thought to represent ...
John A, Long, Kate, Trinajstic
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Exceptional preservation of organs in Devonian placoderms from the Gogo lagerstätte
Science, 2022The origin and early diversification of jawed vertebrates involved major changes to skeletal and soft anatomy. Skeletal transformations can be examined directly by studying fossil stem gnathostomes; however, preservation of soft anatomy is rare. We describe the only known example of a three-dimensionally mineralized heart, thick-walled stomach, and ...
Kate Trinajstic +12 more
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Paleontology: There are more placoderms in the sea
Current Biology, 2021Fossil fish from the Silurian of China continue to surprise. These so-called 'maxillate placoderms', including the newly described Bianchengichthys micros, show a range of anatomical features that question our picture of vertebrate evolution and diversification.
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Placoderm fishes, pharyngeal denticles, and the vertebrate dentition
Journal of Morphology, 2003AbstractThe correlation of the origin of teeth with jaws in vertebrate history has recently been challenged with an alternative to the canonical view of teeth deriving from separate skin denticles. This alternative proposes that organized denticle whorls on the pharyngeal (gill) arches in the fossil jawless fish Loganellia are precursors to tooth ...
Johanson, Z, Smith, M M
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Pelvic and reproductive structures in placoderms (stem gnathostomes)
Biological Reviews, 2014ABSTRACTNewly discovered pelvic and reproductive structures within placoderms, representing some of the most crownward members of the gnathostome stem group and the most basal jawed vertebrates, challenge established ideas on the origin of the pelvic girdle and reproductive complexity.
Trinajstic, Katherine +4 more
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New Early Devonian (late Emsian) placoderms from Belarus
Journal of Paleontology, 2020AbstractFour placoderm fishes are described from the Lepel Beds of the Vitebsk Regional Stage of the Lower Devonian (upper Emsian) of Belarus. Two forms are new (Stipatosteus svidunovitchi new genus, new species and Actinolepis zaikai new species) and the other two taxa are left in open nomenclature (Coccosteidae gen. indet. sp.
Dmitry P. Plax, Michael J. Newman
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Phenotypic plasticity, polymorphism and phylogeny within placoderms
Acta Zoologica, 2009AbstractIntraspecies variation, polymorphism and asymmetric traits are observed within two families of Arthrodira, the Incisoscutidae and Camuropiscidae, from the Gogo Formation in northern Western Australia. Individual plates of the head and trunk shield show considerable variation between individuals.
K. Trinajstic, K. DennisâBryan
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Further consideration of placoderm evolution
Journal of Vertebrate Paleontology, 1983ABSTRACT The flight performances of Pteranodon ingens and Nyctosaurus gracilis from the Upper Cretaceous of Kansas were modeled using data from a Sailvane hang-glider which has an airfoil similar to that of a pterosaur. The aerodynamics of large pterosaurs were mainly dictated by three parameters: low wing loadings, wings with high aspect ratios, and ...
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