Late Devonian Bothriolepidids (Placodermi, Antiarchi) of the Tver Oblast

Moloshnikov, S. V.; Linkevich, V. V.

doi:10.1134/s0031030120020100

Cited by 2 publications

(3 citation statements)

References 7 publications

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“…For the same reason, Moloshnikov assigned B . heckeri to Livnolepis [ 92 ]. Surprisingly, these authors have never acknowledged the phylogenetic status consequence of this change of genus.…”

Section: Discussionmentioning

confidence: 99%

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The Bothriolepis (Placodermi, Antiarcha) material from the Valentia Slate Formation of the Iveragh Peninsula (middle Givetian, Ireland): Morphology, evolutionary and systematic considerations, phylogenetic and palaeogeographic implications

et al. 2023

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Material of the antiarch placoderm Bothriolepis from the middle Givetian of the Valentia Slate Formation in Iveragh Peninsula, Ireland, is described and attributed to a new species, B. dairbhrensis sp. nov. A revision of the genus Bothriolepis is proposed, and its taxonomic content and previous phylogenetic analyses are reviewed, as well as the validity of morphologic characteristics considered important for the establishment of the genus, such as the shape of the preorbital recess of the neurocranium. A series of computerised phylogenetic analyses was performed, which reveals that our new species is the sister taxon to the Frasnian Scottish form B. gigantea. New phylogenetic and biogeographic analyses of the genus Bothriolepis together with comparisons between faunal assemblages reveal a first northward dispersal wave from Gondwana to Euramerica at the latest in the mid Givetian. Other Euramerican species of Bothriolepis seem to belong to later dispersal waves from Gondwana, non-excluding southward waves from Euramerica. Questions remain open such as the taxonomic validity and stratigraphic constraints for the most ancient forms of Bothriolepis in China, and around the highly speciose nature of the genus.

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Section: Discussionmentioning

confidence: 99%

“…The main reason to assign B. zadonica to a distinct genus relies on the thickness of the preorbital recess and the angle between its nasal and facial laminae. For the same reason, Moloshnikov assigned B. heckeri to Livnolepis [92]. Surprisingly, these authors have never acknowledged the phylogenetic status consequence of this change of genus.…”

Section: Plos Onementioning

confidence: 99%

The Bothriolepis (Placodermi, Antiarcha) material from the Valentia Slate Formation of the Iveragh Peninsula (middle Givetian, Ireland): Morphology, evolutionary and systematic considerations, phylogenetic and palaeogeographic implications

et al. 2023

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“…Their research is aimed at collecting Upper Devonian fossils. More recent collecting from the Bilovo locality resulted in a number of recent papers describing new taxa, and revising previously collected material of brachiopods [32], cephalopods [33], antiarchs [34][35][36][37], dipnoans [38] and chondrichthyans [39]. In 2015, the vertebrate collection of the Museum was enriched by Daniil V. Linkevich, who discovered one of the first arthrodire specimens from the MDF (the first being from the Tērvete Formation of Latvia; [40]), a dunkleosteid, from Famennian outcrops in the Tver Region, Russia, adding to our knowledge on the composition and structure of Famennian vertebrate assemblages in this region.…”

Section: Introductionmentioning

confidence: 99%

Structure, Growth and Histology of Gnathal Elements in Dunkleosteus (Arthrodira, Placodermi), with a Description of a New Species from the Famennian (Upper Devonian) of the Tver Region (North-Western Russia)

et al. 2023

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A new species of Dunkleosteus, D. tuderensis sp. nov., is named based on an infragnathal from the Famennian of the Tver Region, Russia. CT scanning of the holotype revealed two high-density bony constituents comparable in position and interrelations to components described for coccosteomorph arthrodires, supported by the presence of at least two clusters of large vascular canals marking separate arterial supplies. Coccosteomorph and dunkleosteid pachyosteomorphs exhibit similar growth patterns including labio-basal depositions of vascularized bone in the infragnathals and basally in the supragnathals. In contrast to coccosteomorphs, dunkleosteid reinforcement of the occlusal margins occurred via the formation of dense osteonal bone, in parallel with resorption forming extensive lingual fossae. Active bone remodeling proceeded without a complete reworking of the primary osteonal bone structure and the original arrangement of vascular canals. Due to inconsistent anatomical terminology in gnathal elements of dunkleosteid arthrodires, a revised terminology is suggested and new terms are introduced.

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Late Devonian Bothriolepidids (Placodermi, Antiarchi) of the Tver Oblast

Cited by 2 publications

References 7 publications

The Bothriolepis (Placodermi, Antiarcha) material from the Valentia Slate Formation of the Iveragh Peninsula (middle Givetian, Ireland): Morphology, evolutionary and systematic considerations, phylogenetic and palaeogeographic implications

The Bothriolepis (Placodermi, Antiarcha) material from the Valentia Slate Formation of the Iveragh Peninsula (middle Givetian, Ireland): Morphology, evolutionary and systematic considerations, phylogenetic and palaeogeographic implications

Structure, Growth and Histology of Gnathal Elements in Dunkleosteus (Arthrodira, Placodermi), with a Description of a New Species from the Famennian (Upper Devonian) of the Tver Region (North-Western Russia)

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