The earliest chimaeriform fish from the Carboniferous of Central Russia

  title={The earliest chimaeriform fish from the Carboniferous of Central Russia},
  author={Oleg A. Lebedev and Evgeny V. Popov and Sergey V. Bagirov and Igor P. Bolshiyanov and Rail I. Kadyrov and Evgeny Statsenko},
  journal={Journal of Systematic Palaeontology},
  pages={821 - 846}
The ancestry of chimaeriform chondrichthyan fishes can be traced back to the Late Triassic (∼220 Ma). To date, only one chimaeriform suborder, the Echinochimaeroidei, has been recognized from the Palaeozoic. The origin and evolution of the chimaeriforms has been a matter of debate for more than a hundred years. This problem is aggravated by the scarcity of holomorphic fossils; the bulk of the material includes only hard parts of the jaw apparatus and other skeletal elements. Here we describe… 


Relationships of the Chimaeriformes and the basal radiation of the Chondrichthyes
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  • Environmental Science
    Reviews in Fish Biology and Fisheries
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Morphological examination of fossil chondrichthyans indicates that the plesiomorphous state of the gnathostome suspensorium is autodiastylic and that complex labial cartilages are primitive and likely to have been critical to the mechanical architecture of the first jaws.
A symmoriiform chondrichthyan braincase and the origin of chimaeroid fishes
The results of a computed tomography analysis of Dwykaselachus, an enigmatic chondrichthyan braincase from the ~280 million year old Karoo sediments of South Africa, reveal preconditions that suggest an initial morpho-functional basis for the derived chimaeroid cranium, and shed new light on the chondRichthyan response to the extinction at the end of the Devonian period.
A symmoriiform from the Late Devonian of Morocco demonstrates a derived jaw function in ancient chondrichthyans
A previously undescribed symmoriiform shark, Ferromirum oukherbouchi, from the Late Devonian of the Anti-Atlas is reported, in which the jaw articulation is specialized and drives mandibular rotation outward when the mouth opens, and inward upon closure.
An early chondrichthyan and the evolutionary assembly of a shark body plan
Preliminary phylogenetic results highlight the likely convergent evolution of conventional chondrichthyan conditions among earliest members of this primary gnathostome division, while skeletal morphology points towards the likely suspension feeding habits of Gladbachus, suggesting a functional origin of the gill slit condition characteristic of the vast majority of living and fossil chondRichthyans.
Interpretation of the toothplates of chimaeroid fishes
It has been argued that the toothplates of chimaeroid fishes exhibit a mode of growth that is fundamentally different from that of other chondrichthyans. Chimaeroid toothplates are supposed to be
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  • Biology
    Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
  • 1965
There is found to be strong evidence that the chimaeroids are derived, through the Jurassic myriacanthids and allied forms, from a Palaeozoic group which includes the Permian Menaspis and whose most primitive known genus is Deltoptychius.
Chondrenchelys problematica (Traquair, 1888) redescribed: a Lower Carboniferous, eel-like holocephalan from Scotland
  • J. Finarelli, M. Coates
  • Biology
    Earth and Environmental Science Transactions of the Royal Society of Edinburgh
  • 2014
Chondrenchelys problematica, from the Viséan (Holkerian) of Scotland, is the earliest holocephalan known from extensive cranial and postcranial material and is recommended as a hard minimum age for the last common ancestor of elasmobranchs and chimaeroids, because of its secure association with other holocephalans, and current uncertainties concerning elasmOBranch stem lineage membership.
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Through evolution, hypermineralized dentine becomes enclosed within the trabecular dentine, and specialized by reduction into specific zones within a composite dental plate, with these increasing in morphological disparity, all reflecting loss of defined teeth but retention of dentine production from the inherited developmental package.
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Comparison with the tooth plates of Chimaera monstrosa indicates that compound tooth plates may be a feature of all chimaeroids in which a descending lamina is present, and provides further evidence to support a lyodont dentition in chimeraeroid fishes similar to that found in other chondrichthyans.
Histologic Studies of Ostracoderms, Placoderms and Fossil Elasmobranchs 5. Ptyctodontid tooth plates and their bearing on holocephalan ancestry: the condition of chimaerids
It is concluded that statodont elements of this kind cannot have had connection with the dentition of iniopterygians and cannot either have evolved from lyodont dental units of such bradyodonts as, for example, the cochliodontids.