Results 81 to 90 of about 338 (111)
Hyperossification in the vertebral column of Devonian placoderm fishes (Arthrodira)
Journal of Vertebrate Paleontology, 2020 Skeletal bone enlargement (hyperossification) was thought to only occur in endochondral and dermal bones (e.g., endoskeletons of marine tetrapods and dermal bones of certain jawless vertebrates, placoderms, and teleost fishes). However, in some arthrodiran placoderms (basal jawed vertebrates), i.e., Millerosteus minor, Compagopiscis croucheri ...
Mason N Dean, Zerina Johanson
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A new genus of placoderm (Arthrodira: ‘Actinolepida’) from the Lower Devonian of Podolia (Ukraine) [PDF]
Journal of Vertebrate Paleontology, 2007 A new genus of ‘actinolepid’ arthrodire placoderm, Erikaspis, is named to contain “Kujdanowiaspis” zychi Stensio, 1945, from the Lochkovian–Pragian deposits (Lower Devonian) of Podolia (Ukraine). This new genus occurs together with the genus Kujdanowiaspis Stensio, 1942, to which its type species was previously assigned.
Vincent G C Dupret, Daniel Goujet
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Middle Devonian coccosteid (Arthrodira, Placodermi) biostratigraphy of Scotland and Estonia
Scottish Journal of Geology, 2017A coccosteid nuchal bone from the Middle Devonian Tamme Cliffs locality in Estonia is described as Dickosteus cf. threiplandi , D . threiplandi being a common species in the Middle Devonian of the Orcadian Basin, Scotland.
Michael J Newman
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Palaeogeography, Palaeoclimatology, Palaeoecology, 2011 Different palaeogeographic models have been proposed for the position of Laurussia ( including Baltica) and Gondwana-derived microcontinents ( including Ibero-Armorica) during Ordovician to Late Carboniferous times. Principal differences concern the presence and duration of a large ocean, the Rheic Ocean, acting as a faunal barrier between these areas.
Vincent G C Dupret
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Journal of Vertebrate Paleontology, 2008
ABSTRACT Wuttagoonaspida is a very peculiar group of Arthrodira, hitherto known only in the Early-Middle Devonian deposits of Australia. The new genus and species Yiminaspis shenme described here is known from an incomplete skull roof from the Pragian of Zhaotong (Yunnan, South China). Despite sharing some features with the Petalichthyida (e.g.
Vincent G C Dupret
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ABSTRACT Wuttagoonaspida is a very peculiar group of Arthrodira, hitherto known only in the Early-Middle Devonian deposits of Australia. The new genus and species Yiminaspis shenme described here is known from an incomplete skull roof from the Pragian of Zhaotong (Yunnan, South China). Despite sharing some features with the Petalichthyida (e.g.
Vincent G C Dupret
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Les Plourdosteidae fam. nov. (Placodermi, Arthrodira) et leurs relations phylétiques au sein des Brachythoraci [PDF]
Canadian Journal of Earth Sciences, 1990 The study of Plourdosteus canadensis (Brachythoraci, Placodermi) from the Escuminac Formation (Frasnian) led us to erect a new family: the Plourdosteidae. Firstly, we discuss all the characteristics that allowed Ørvig to differentiate the genus Plourdosteus from Coccosteus.
You-An Zhu, Min Zhu, Jun-Qing Wang
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Journal of Vertebrate Paleontology, 1984
ABSTRACT Evaluation of the characters used to determine the phylogeny and classification of arthrodires leads to the following conclusions: Actinolepidae are defined only by characters primitive for the order. Holonematidae are not brachythoracans but are related to Phlyctaeniidae.
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ABSTRACT Evaluation of the characters used to determine the phylogeny and classification of arthrodires leads to the following conclusions: Actinolepidae are defined only by characters primitive for the order. Holonematidae are not brachythoracans but are related to Phlyctaeniidae.
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A biomechanical model of feeding kinematics forDunkleosteus terrelli(Arthrodira, Placodermi)
Paleobiology, 2009Biomechanical models illustrate how the principles of physics and physiology determine function in organisms, allowing ecological inferences and functional predictions to be based on morphology. Dynamic lever and linkage models of the mechanisms of the jaw and skull during feeding in fishes predict function from morphology and have been used to compare
Anderson, PSL, Westneat, MW
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