Relationships of the Chimaeriformes and the basal radiation of the Chondrichthyes

  title={Relationships of the Chimaeriformes and the basal radiation of the Chondrichthyes},
  author={Richard Lund and Eileen D. Grogan},
  journal={Reviews in Fish Biology and Fisheries},
  • R. Lund, E. Grogan
  • Published 1 March 1997
  • Environmental Science
  • Reviews in Fish Biology and Fisheries
The origin and early evolution of the cartilaginous fishes (Chondrichthyes) has been the subject of considerably more debate than of data. The two modern groups, Chimaeriformes and Elasmobranchii, differ so radically in morphology that in the past they have often been considered unrelated -- descended from some remote and unknown common ancestor. The current consensus promotes the Chimaeriformes and Elasmobranchii as sister taxa of the Class Chondrichthyes which are linked by an assemblage of… 

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The early evolutionary history of sharks and shark-like fishes

It is proposed that chondrichthyan dermoskeletal characters carry a phylogenetic signal, allowing to interpret the documented diverse types of scale morphogenesis as evidence for a major radiation of chondRichthyan lineages in the Lower Palaeozoic.

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The first skeletal remains of Phoebodus from the Famennian (Late Devonian) of the Maïder region of Morocco are reported, revealing an anguilliform body, specialized braincase, hyoid arch, elongate jaws and rostrum, complementing its characteristic dentition and ctenacanth fin spines preceding both dorsal fins.

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A symmoriiform from the Late Devonian of Morocco demonstrates a derived jaw function in ancient chondrichthyans

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  • C. Duffin
  • Environmental Science, Geography
    Special Publications
  • 2015
Abstract Fossil chondrichthyan teeth played an important part in the establishment of a scientific understanding of ‘formed stones’. Following a slowly emerging taxonomy, Louis Agassiz presented the

Contribution to the molecular phylogenetic analysis of extant holocephalan fishes (Holocephali, Chimaeriformes)

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The assemblages of chondrichthyan microremains from the Famennian of Armenia show great resemblances to those from central iran. particularly, the very rich sample (almost 200 teeth) from the lower



On the Structure and Affinities of the Carboniferous Cochliodont Helodus simplex

It is concluded that the Cochliodonts are almost certainly closely related to the ancestors of the Holocephali, and the relatively unspecialized condition of the teeth gives support to the view that the holostylic condition ofThe jaws is primitive for the group.


The two best preserved specimens of the Upper Permian fish Menaspis armata have been reinvestigated, resulting in new interpretations of a variety of anatomical features, finding that the menaspids cannot possibly be closely related to the chimaeriforms, nor to any of those better known bradyodonts with which they were previously classified.


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  • J. R. F. Dick
  • Environmental Science
    Transactions of the Royal Society of Edinburgh
  • 1978
Synopsis Skeletal remains of Tristychius arcuatus commonly occur in ironstone nodules from the Scottish Upper and Lower Oil Shale Groups. This material is clearly distinguishable from the small shark

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The dental morphology and histology of the clade containing Tanaodus, Harpacodus, and Lisgodus support a hypothesis of sister group relationships with the Petalodontiformes as restricted.

Diplodoselache woodi gen. et sp. nov., an early Carboniferous shark from the Midland Valley of Scotland

  • J. R. F. Dick
  • Environmental Science, Geography
    Transactions of the Royal Society of Edinburgh: Earth Sciences
  • 1981
ABSTRACT A new fossil elasmobranch from the Lower Carboniferous Oil Shale groups (Viséan) of the Edinburgh area shows a mosaic of characters typical of at least two groups of early sharks. Its most

II - The Acanthodian fishes

The Acanthodian fishes form one of the most sharply demarcated and recognizable groups of vertebrate fossils, and their characteristic squamation of square, exceedingly minute ganoid scales, distinguish them sharply from all other fishes, and enable even fragmentary specimens to be recognized without doubt.

Histologic Studies of Ostracoderms, Placoderms and Fossil Elasmobranchs

Dermal jaw‐elements with quite the same developmental and structural features as those of brachythoracid or holonematid arthrodires are unknown in other fishes, including elasmobranchs.

On the Dentition of the Petalodont Shark, Climaxodus

  • A. Woodward
  • History
    Quarterly Journal of the Geological Society of London
  • 1919
The dentition of the Petalodont sharks is still very imperfectly known. It has hitherto been satisfactorily observed only in the highly-specialized Janassa bituminosa from the Upper Permian