A new tristichopterid (Sarcopterygii, Tetrapodomorpha) from the Upper Famennian Evieux Formation (Upper Devonian) of Belgium

• 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.

Ämnesord

NATURVETENSKAP  -- Biologi (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences (hsv//eng)

Nyckelord

Belgium

biogeography

Late Devonian

phylogeny

Tetrapodomorpha

Tristichopteridae

Biology

Biologi

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)