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A new tristichopterid (Sarcopterygii, Tetrapodomorpha) from the Upper Famennian Evieux Formation (Upper Devonian) of Belgium
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Physiology and Developmental Biology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Physiology and Developmental Biology, Evolutionary Organism Biology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Physiology and Developmental Biology.
2009 (English)In: Palaeontology, ISSN 0031-0239, E-ISSN 1475-4983, Vol. 52, 823-836 p.Article in journal (Refereed) Published
Abstract [en]

Additional material of a large specimen of tristichopterid fish from   the Upper Famennian Evieux Formation of Belgium is described. This   large fish was previously assigned to Tristichopteridae gen. et sp.   indet. due to the lack of diagnostic anatomical data. New available   material consists of the internal surface of the parietal shield,   vomers and anterior part of the parasphenoid, subopercular and   submandibulo-branchiostegal bones, and an internal view of the anterior  part of the mandible. A possible autapomorphy of the new form from   Belgium, Langlieria socqueti gen. nov. et sp. nov., is the absence of   marginal teeth on the vomer except on its most lateral part. Apart from   these features, it only differs from the genus Mandageria from   Australia in the absence of marginal teeth between the dentary fang and   the mandibular symphysis, in the presence of a raised marginal crest   lateral to the anterior coronoid fang, and in the presence of numerous   small marginal teeth on the premaxilla. It differs from the   cosmopolitan genus Eusthenodon in a number of respects: the   supratemporal, tabular, and postparietal bones are superficially fused,   as are the intertemporal and parietal bones, the dermal ornament is   proportionally very fine, and the denticulated field of the   parasphenoid stands proud rather than being recessed into the body of   the bone.

Place, publisher, year, edition, pages
2009. Vol. 52, 823-836 p.
Keyword [en]
Belgium, biogeography, Late Devonian, phylogeny, Tetrapodomorpha, Tristichopteridae
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-97004DOI: 10.1111/j.1475-4983.2009.00876.xISI: 000268060800009OAI: oai:DiVA.org:uu-97004DiVA: diva2:171767
Available from: 2008-04-03 Created: 2008-04-03 Last updated: 2017-12-14
In thesis
1. Morphology, Taxonomy and Interrelationships of Tristichopterid Fishes (Sarcopterygii, Tetrapodomorpha)
Open this publication in new window or tab >>Morphology, Taxonomy and Interrelationships of Tristichopterid Fishes (Sarcopterygii, Tetrapodomorpha)
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Tristichopterids (Sarcopterygii, Tetrapodomorpha) form a monophyletic group of exclusively Devonian fishes. This thesis consists of descriptions of new material of tristichopterids and closely related taxa, as well as new interpretations and descriptions of previously figured material. Redescribed specimens were originally figured as far back as 1861, and publications as old as this are almost always of limited use as anatomical and systematical references, in addition to being difficult to acquire. The possibility of using new techniques and new theoretical frameworks also provides good justification for taking a second look at such specimens. In the case of this thesis, this includes the use of computed tomography scanning methods, and the cladistic approach to describing the interrelationships of taxa.

The thesis includes a complete taxonomy of valid tristichopterid taxa, in addition to two new phylogenetic analyses incorporating the taxa that were described or redescribed. One of the analyses deals with the interrelationships of taxa along the entire tetrapod stem, and establishes the monophyly of the Tristichopteridae. The other analysis focuses on tristichopterid interrelationships.

An account is given of evolutionary trends within Tristichopteridae, and instances of parallel evolution between tristichopterids and other tetrapodomorph groups are discussed.

The biogeographical implications of tristichopterid occurences world-wide seem to corroborate the picture provided by other vertebrate groups, and give further support to one of two main hypotheses concerning the relative positions of Gondwana and Laurussia, the two major palaeocontinents during the Late Devonian. The supported hypothesis proposes a close proximity between southern Laurussia and northwestern Gondwana, as evidenced by the wide dispersal of derived tristichopterids by the Late Devonian. A Laurussian origin of tristichopterids is proposed.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2008. 54 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 421
Keyword
Organismic biology, Sarcopterygii, Tetrapodomorpha, Tristichopteridae, biogeography, phylogeny, Computed Tomography, Devonian, Organismbiologi
Identifiers
urn:nbn:se:uu:diva-8625 (URN)978-91-554-7153-8 (ISBN)
Public defence
2008-04-25, Lindahlsalen, Evolutionsbiologiskt Centrum, Norbyvägen 18A, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2008-04-03 Created: 2008-04-03 Last updated: 2009-04-03Bibliographically approved

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