A NEW TYPE OF PALAONISCOID FISH: 3. A new Type of Palaeoniscoid Fish, with Remarks on the Evolution of the Actinopterygian Pectoral Fins
Identifieur interne : 001600 ( Istex/Curation ); précédent : 001599; suivant : 001601A NEW TYPE OF PALAONISCOID FISH: 3. A new Type of Palaeoniscoid Fish, with Remarks on the Evolution of the Actinopterygian Pectoral Fins
Auteurs : Erbol Ivor WhiteSource :
- Proceedings of the Zoological Society of London [ 0370-2774 ] ; 1939-05.
Abstract
A new fish‐fauna is described from the Middle Culm (barren Coal) Measures of Bude, North Cornwall, comprising three species, of which two, the Acan‐thodian Acanthodes wardi Egerton and the Palaeoniscid ElonicMhys aitkeni Traquair, are already well known and have a fairly wide distribution in the English Coal Measures. The third form belongs to a very distinct new genus and species, Cornuboniscus budensis, which, while a typical Palaeoniscid in its fusiform shape, heterocercal tail, and in most other features of its external anatomy, differs from all normal members of that group in having a paddlelike pectoral fin supported by a uniform row of radials but without basal elements. The structure of this fin is compared with those of the aberrant Lower Carboniferous genus Tarrasius and the living Polypterines, and it is tentatively suggested that Cornuboniscus may be a survivor from the original normally shaped Palaeoniscoid stock which, after acquiring the characteristic pectoral fins, gave rise subsequently to degenerate elongated types, of which Tarrasius and the Polypterines represent different branches. The fossils are preserved as external moulds, and are sometimes quite uncrushed, so that many details of the anatomy usually obscured are finely preserved, especially the sensory canal‐system and the bones of the rostral region. Finally, in a survey of the principal types of Actinopterygian pectoral fins it is suggested on the evidence of the development of these organs that the Palseoniscoids must have divided very early into four groups, and an attempt is made to show how the principal types of pectoral fins in existing Actinopterygian fishes might have been derived from the fins in those groups.
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DOI: 10.1111/j.1469-7998.1939.tb00023.x
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">A NEW TYPE OF PALAONISCOID FISH: 3. A new Type of Palaeoniscoid Fish, with Remarks on the Evolution of the Actinopterygian Pectoral Fins</title><author><name sortKey="White, Erbol Ivor" sort="White, Erbol Ivor" uniqKey="White E" first="Erbol Ivor" last="White">Erbol Ivor White</name><affiliation><mods:affiliation>Department of Geology, British Museum (Natural History)</mods:affiliation><wicri:noCountry code="subField">History)</wicri:noCountry></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:103A38B488219B07653856D89EA7EB39A2BCB031</idno><date when="1939" year="1939">1939</date><idno type="doi">10.1111/j.1469-7998.1939.tb00023.x</idno><idno type="url">https://api.istex.fr/document/103A38B488219B07653856D89EA7EB39A2BCB031/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001602</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001602</idno><idno type="wicri:Area/Istex/Curation">001600</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">A NEW TYPE OF PALAONISCOID FISH: 3. A new Type of Palaeoniscoid Fish, with Remarks on the Evolution of the Actinopterygian Pectoral Fins</title><author><name sortKey="White, Erbol Ivor" sort="White, Erbol Ivor" uniqKey="White E" first="Erbol Ivor" last="White">Erbol Ivor White</name><affiliation><mods:affiliation>Department of Geology, British Museum (Natural History)</mods:affiliation><wicri:noCountry code="subField">History)</wicri:noCountry></affiliation></author></analytic><monogr></monogr><series><title level="j">Proceedings of the Zoological Society of London</title><idno type="ISSN">0370-2774</idno><idno type="eISSN">1469-7998</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="1939-05">1939-05</date><biblScope unit="volume">B109</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="41">41</biblScope><biblScope unit="page" to="61">61</biblScope></imprint><idno type="ISSN">0370-2774</idno></series><idno type="istex">103A38B488219B07653856D89EA7EB39A2BCB031</idno><idno type="DOI">10.1111/j.1469-7998.1939.tb00023.x</idno><idno type="ArticleID">JZO41</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0370-2774</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">A new fish‐fauna is described from the Middle Culm (barren Coal) Measures of Bude, North Cornwall, comprising three species, of which two, the Acan‐thodian Acanthodes wardi Egerton and the Palaeoniscid ElonicMhys aitkeni Traquair, are already well known and have a fairly wide distribution in the English Coal Measures. The third form belongs to a very distinct new genus and species, Cornuboniscus budensis, which, while a typical Palaeoniscid in its fusiform shape, heterocercal tail, and in most other features of its external anatomy, differs from all normal members of that group in having a paddlelike pectoral fin supported by a uniform row of radials but without basal elements. The structure of this fin is compared with those of the aberrant Lower Carboniferous genus Tarrasius and the living Polypterines, and it is tentatively suggested that Cornuboniscus may be a survivor from the original normally shaped Palaeoniscoid stock which, after acquiring the characteristic pectoral fins, gave rise subsequently to degenerate elongated types, of which Tarrasius and the Polypterines represent different branches. The fossils are preserved as external moulds, and are sometimes quite uncrushed, so that many details of the anatomy usually obscured are finely preserved, especially the sensory canal‐system and the bones of the rostral region. Finally, in a survey of the principal types of Actinopterygian pectoral fins it is suggested on the evidence of the development of these organs that the Palseoniscoids must have divided very early into four groups, and an attempt is made to show how the principal types of pectoral fins in existing Actinopterygian fishes might have been derived from the fins in those groups.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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