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Cavin L.,Museum of Natural History | Cavin L.,Natural History Museum in London | Forey P.L.,Natural History Museum in London | Giersch S.,Referat fur Palaontologie und Evolutionsforschung
Journal of Systematic Palaeontology | Year: 2013

The osteology of the ichthyodectiform Eubiodectes libanicus (Pictet & Humbert, 1866) from the Cenomanian of Lebanon is described on the basis of acid-prepared specimens. For comparative purposes, the osteology of other putative ichthyodectiforms is described or discussed. We focus on the description of hitherto poorly described species such as Chiromystus mawsoni Cope, 1885, Ghrisichthys bardacki (Cavin, 1997a), 'Saurodon' intermedius (Newton, 1878) and Thrissops sp. from Kimmeridge, England. Sixty-nine morphological characters are defined and analysed to infer the phylogenetic relationships within ichthyodectiforms. The main results are: (1) exclusion of Ascalabothrissops and Pachythrissops from the ichthyodectiforms; (2) redesignation of 'Ichthyodectes' bardacki, from the Turonian of Morocco, to Ghrisichthys gen. nov.; (3) resolution of a monophyletic family Cladocyclidae grouping mid-Cretaceous ichthyodectiforms that lived mainly along the southern margin of Tethys (Chirocentrites, Cladocyclus, Eubiodectes, Chiromystus); (4) resolution of a Late Cretaceous family Ichthyodectidae containing Ichthyodectes, Ghrisichthys and Xiphactinus from mid-northern latitude seas; and (5) a better resolved Late Cretaceous family Saurodontidae in the northern hemisphere, that includes the genus Gillicus. © 2013 Natural History Museum.

Giersch S.,Referat fur Palaontologie und Evolutionsforschung | Frey E.,Referat fur Palaontologie und Evolutionsforschung | Stinnesbeck W.,University of Heidelberg | Gonzalez Gonzalez A.H.,Centro Metropolitano Parque Las Maravillas
Neues Jahrbuch fur Geologie und Palaontologie - Abhandlungen | Year: 2010

In this paper we report on a specimen of Pachyrhizodus caninus COPE, 1872 (Teleostei, Crossognathiformes) from the early Turonian of Vallecillo (North-eastern Mexico). P. caninus is considered to be a typical faunal element of the Western Interior Seaway, however, its occurrence in Vallecillo shows that this species was not restricted to the Seaway realm. The described specimen is the stratigraphically oldest record of this species. Comparisons with the European type species Pachyrhizodus basalis (DIXON, 1850) show that both P. caninus and P. basalis are valid species. The occurrence of a Western Interior faunal element in the assemblage of Vallecillo underlines the importance of this locality in understanding the palaeobiogeographical relations of the Western Tethys and adjacent realms in the late Cretaceous. © 2010 Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany.

Giersch S.,Referat fur Palaontologie und Evolutionsforschung | Frey E.,Referat fur Palaontologie und Evolutionsforschung | Stinnesbeck W.,University of Heidelberg | Ifrim C.,University of Heidelberg | Padilla Gutierrez J.M.,Centro Metropolitano Parque Las Maravillas
Swiss Journal of Geosciences | Year: 2011

A new species of the clupeid genus Scombroclupea is described from the Upper Cretaceous (Cenomanian) Plattenkalk locality "Loma la Mula" in Coahuila, northeastern Mexico. The material provides new osteological data for the genus, which clarify its systematic position. The Mexican Scombroclupea points to an occurrence of the genus in the western Tethys and indicates a vicariant event between S. macrophthalma from Lebanon and Croatia and the new species described herein. The analysis of the functional morphology of Scombroclupea supports the reconstruction of an oscillatory locomotion mode in this genus. © 2011 Swiss Geological Society.

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