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Brussels, Belgium

The osteology of Prognathoglossum kalassyi, an osteoglossiform teleostean fish from the marine Cenomanian of En Nammoura in Lebanon, is described in details. This fish exhibits an important prognathism. The frontal is broad and short. The temporal fossa is located very laterally on the braincase. There is a small postfrontal behind the frontal. The parietal forms the dorsal border of the temporal fossa. The saccular-lagenar bulla is hypertrophied. This series of specialized characters is shared by the Recent osteoglossoid Pantodon and leads to range this Lebanese fossil genus within the family Pantodontidae.

The osteology and the phylogenetic relationships of three ichthyodectids from the Aptian bituminous shales of Equatorial Guinea and Gabon are studied. The first species was already known as Chirocentrites guinensis. It is a valid species but its skeleton shows that it does not belong to Chirocentrites but to Chiromystus, a genus characterized by its enlarged and branched pectoral rays and a short vertebral axis. The differences between Chiromystus and Cladocyclus are brought to light to demonstrate the validity of Chiromystus. The second species is only known by some cranial fragments, particularly the jaws. It is a new genus and species, Africathrissops weileri, which seems primitive and close to Thrissops. Its articulation facet for the quadrate is formed by the retroarticular and the articular without a participation of the angular. The third species Verraesichthys bloti is new and represents a new genus too, also characterised by a short axial skeleton, but its skull and its pectoral girdle strongly differ from those of Chiromystus. The caudal skeleton of an unnamed but specialised ichthyodectid is also described.

Bogan S.,Maimonides University | Taverne L.,Residence Les Platanes | Agnolin F.L.,Maimonides University | Agnolin F.L.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia
Bulletin de l'Institut Royal des Sciences Naturelles de Belqique, Sciences de la Terre | Year: 2010

We describe the first authenticated fossil record for the family Amiidae in Argentina. The specimen consists on an isolated dentary coming from the Uppermost Cretaceous Allen Formation, from Rio Negro province, Patagonia, Argentina, and belonging probably to the genus Amia. This specimen spans the biochronology of the Amiidae in South America, which were up to now restricted to Lower Cretaceous outcrops of Brazil. We also review the only previously reported amiid fish from the Neogene of South America. This single specimen consists of a dentary and some postcranial bones. It was originally named Pappichthys patagonica by AMEGHINO (1906). The study of this material allowed us to refer this species to the family Osteoglossidae, thus constituting the first fossil or extant record for the clade in Argentina.

Taverne L.,Residence Les Platanes | Nolf D.,Institute Royal Des Science Naturelles Of Belgique
Bulletin de l'Institut Royal des Sciences Naturelles de Belqique, Sciences de la Terre | Year: 2010

The osteology of the fossil priacanthid Pristigenys rutoti (= P. caduca) (Teleostei, Percoidei) from the Sands of Lede (marine Middle Eocene, Belgium) is described in details thanks to a nearly complete specimen with a skull preserved in volume and to other samples with isolated bones. A new species, Pristigenys hermani, also from the Sands of Lede, is erected on the basis of isolated bones and otoliths. The two species are compared together. It is shown that the skeletal elements and the otoliths of Pristigenys dentifer from the Eocene of England are identical to the homologous pieces of P. rutoti. The English species is put into synonymy of the Belgian species which has the priority. The evolution of the sagitta within Priacanthidae is discussed.

Capasso L.L.,University of Chieti Pescara | Taverne L.,Residence Les Platanes | Nohra R.,Expo Haqel
Bulletin de l'Institut Royal des Sciences Naturelles de Belqique, Sciences de la Terre | Year: 2010

Hensodon spinosus, a rare and very peculiar pycnodontiform fish Hensodon spino from the Upper Cenomanian limestone of the Haqel fossils quarry (Lebanon) is re-described on the basis of four new specimens. It is the only species assigned to the genus. It shares with the family Coccodontidae (sensu POYATO-ARIZA & WENZ, 2002) almost all its synapomorphies but is also characterized by several unique autapomorphies. The species exhibits a rounded general shape of the body, an enormous head, an extremely reduced snout with a minute mouth gash, a homy frontal showing modifications that we interpret as dimorphic sexual differences, styliform teeth, a giant occipital process with many spines on its margins and formed by the dermosupraoccipital, the parietal and the supratemporal, a prefrontal, an edentulous, unornamented, elongated rhomboid maxilla, a very massive spiny cleithrum, a big spiny post-coelomic bone, and a few elongated bar scales. All those characters award a unique impressive aspect to the fish. Remains of the original colour pattern add information about the external aspect of this remarkable fish.

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