1,721,005 research outputs found
Sur la position systématique et les affinites de Greenwood- della Tockensis Taverne, L. et Ross, P.H. 1973 (Pisces Elopiformes) de l’Aptien inférieur de l’Ile d’Helgoland (Allemagne)
No full textThe relationships of Greenwoodella tockensis TAVERNE, L. and Ross, P. H., 1973 are discussed. This fish is referred to a new family, Greenwoodellidae,and placed in the sub-order Albuloidei (Pisces Elopiformes) as an ancestor of the Albulidae and Pterothrissidae
Comments on the phylogenetic relationships of Pholidorhynchodon malzannii and Eurycormus speciosus (Teleostei, "Pholidophoriformes"), two Mesozoic tropical fishes
No full textThe phylogenetic relationships of Pholidorhynchodon malzannii and Eurycormus speciosus, two Mesozoic teleosts of the "Pholidophoriformes" lineage, are commented on the basis of the available osteological data. To conclude, the belonging of Pholidorhynchodon to the Pholidophoridae sensu stricto is contested and the genus is ranged within the family Ankylophoridae. It is also shown that Eurycormus is more evolved than Catervariolus and not less evolved, as thought by some. Anatomical arguments are developed that militate for the inclusion of Eurycormus in the family Ankylophoridae
Osteology and relationships of Lebrunichthys nammourensis gen. And sp. nov. (Teleostei, Crossognathiformes, Pachyrhizodontidae), a fossil fish from the marine Upper Cretaceous of Lebanon
No full textThe osteology and the relationships of Lebrunichthys nammourensis gen. and sp. nov., a new pachyrhizodontid fish from the marine Upper Cenomanian of Lebanon, are studied in details. The new genus belongs to the subgroup of Pachyrhizodontidae having a posterior pointed process on the pterotic. The characters of the caudal skeleton indicate that Lebrunichthys occupies an intermediate systematic position between Stanhopeichthys, one the one hand, and all the other genera of the subgroup, on the other hand
New data on the osteology and relationships of Flagellipinna rhomboides, a pycnodont fish (Pycnodontidae) from the Cenomanian (Upper Cretaceous) of Lebanon
No full textThe skeleton of the fossil fish Flagellipinna rhomboides, a Pycnodontidae from the marine Cenomanian (Late Cretaceous) of Lebanon, is described and its systematic position within the family discussed. The frontal is short, curved and broad. The brush-like process of the parietal is shortened. The neural and haemal arches are in hyper-complex contact. The last neural spines before the tail are vestigial. The anal fin contains 50 to 53 pterygiophores. The caudal fin is vertical. Three hypochordals are hypertrophied. There are bar-scales not only in the abdominal but also in the caudal region of the body. All these evolved characters clearly indicate that F. rhomboides belongs to the Nursalliini, a specialized tribe of the subfamily Pycnodontinae
A new insight into the Protobramidae (Teleostei, Tselfatiiformes), a fossil fish family from the marine Cenomanian (Upper Cretaceous) of Lebanon
No full textThe study of new specimens of Abisaadichthys and Eusebichthys, two genera belonging to the Protobramidae (Tselfatiiformes), a teleost family from the marine Cenomanian (Upper Cretaceous) of Lebanon, gives a better knowledge of the skeleton of these fishes. The discovery of a pelvic girdle in thoracic position in Eusebichthys allows a better understanding of the phylogeny within the family
New data on Pankowskichthys libanicus (Pycnodontiformes, Gladiopycnodontidae), a fossil fish from the marine Upper Cretaceous of Lebanon
No full textA male specimen of Pankowskichthys libanicus is described and compared with the holotype of the species, considered as a female. The comparison with Ducrotayichthys cornutus is also done
Osteology and relationships of Stanhopeichthys libanicus gen. And sp. nov. (Teleostei, Crossognathiformes, Pachyrhizodontidae) from the marine Cenomanian (Upper Cretaceous) of Lebanon
No full textThe osteology and the relationships of Stanhopeichthys libanicus gen. and sp. nov., a new pachyrhizodontid fish from the marine Upper Cenomanian of Hgula (Lebanon), are studied in details. The new genus belongs to the subgroup of Pachyrhizodontidae having a posterior pointed process on the pterotic. With the three last caudal vertebrae not fused, seven autogenous hupurals, three epurals and three uroneurals, Stanhopeichthys exhibits the less evolved caudal skeleton within that subgroup. Stanhopeichthys and the Italian genus Nardopiscis share a specialized character not present in other pachyrhizodontid fishes. Their two parietals are separated from each other by the posterior narrow region of the frontals and not by the supraoccipital
L’origine de la “Cité des Côtes” de Clermont-Ferrand
No full textTaverne A., Taverne L. L’origine de la “Cité des Côtes” de Clermont-Ferrand. In: La Terre et La Vie, Revue d'Histoire naturelle, tome 4, n°2, 1934. pp. 103-106
Nursallia tethysensis sp. nov., a new pycnodont fish (Neopterygii: †halecostomi) from the Cenomanian of Lebanon
No full textA new species of Pycnodont, Nursallia tethysensis, is described from the Cenomanian of En Nammoura and Hgula (Lebanon). It is a rarely encountered member of the ichthyofauna in these two localities and represents the smallest-sized species ever described in the genus. The frontal is broad, rounded, with an almost vertical profile. The hypertrophied dermosupraoccipital bears small spines on its median line. The parietal does not contact the frontal. The dermopterotic and the frontal join by only a thin osseous bridge under the dermosupraoccipital and above the orbit. The ventral profile has a characteristic "V"-shape notch at the junction between the head and the abdomen. There are 31 to 33 vertebrae. Nursallia tethysensis shows a closer relationship with N. gutturosum from the Cenomanian of Morocco and Italy than with the other species of the genus. The particularly good state of preservation permits examination of the ultrastructure of the teeth, demonstrating the presence of dentinal canaliculii only in the radicular area of these teeth. The chemical composition of both the eyes (characterized by high sulphur content, presumably derived from the original proteins of this région) and the bones (constituted of hydroxy-apatite almost identical to the bone component of modern fishes) are proof of the complete conservation of the organic remains fossilized in the Lebanese Cenomanian limestones
Osteology and phylogenetic relationships of Gregoriopycnodus bassanii gen. nov., a pycnodont fish (Pycnodontidae) from the marine Albian (Lower Cretaceous) of Pietraroja (southern Italy)
No full textThe osteology and the phylogenetic relationships of Gregoriopycnodus bassanii gen. nov., a pycnodont fish from the marine Albian (Lower Cretaceous) of Pietraroja (southern Italy), are studied in details. This fossil genus belongs to the family Pycnodontidae, as shown by the presence of a branched peniculus on the parietal. Gregoriopycnodus differs from the other genera of the family by its short and plate-like prefrontral that is partly fused to the mesethmoid. Within the family, the systematic position of Gregoriopycnodus is intermediate between that of Tepexichthys and Costapycnodus, on the one hand, and that of Proscinetes, on the other hand
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