Residence Les Platanes

Brussels, Belgium

Residence Les Platanes

Brussels, Belgium

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The skull, pectoral girdle, vertebrae, caudal skeleton and scales of the osteoglossiform teleost Chanopsis lombardi from the continental Lower Cretaceous of the Democratic Republic of Congo are studied in detail. On the basis of the caudal characters and scales, Chanopsis is considered to represent the most primitive member of the family Osteoglossidae sensu lato (including Pantodontidae and Arapaimidae), whereas the Singididae (Singida and Chauliopareion) are shown to correspond to another lineage of osteoglossiform fishes, clearly distinct from the Osteoglossidae. © 2016, Geologica Belgica. All rights reserved.


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.


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.


Bogan S.,Maimónides University | Taverne L.,Residence Les Platanes | Agnolin F.L.,Maimónides 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.


Bogan S.,Maimónides University | Taverne L.,Residence Les Platanes | 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: 2011

Some braincases, a predentary, a few vertebrae and scales of a new aspidorhynchid species, Belonostomus lamarquensis sp. nov., are described from the Upper Cretaceous (Campanian-Maastrichtian) Allen Formation of Patagonia, Argentina. The new species differs from the other Belonostomus species by its flank scales having an anterior smooth region separated by a vertical groove from a posterior region bearing a series of numerous and closely spaced subparallel ridges that end in a deeply crenulated posterior margin. The dermal bones are ornamented with ridges and tubercles, a rare character in Belonostomus. The endocranial bones are completely fused together, except the basisphenoid. Within the Belonostomus species, B. lamarquensis seems closely related to B. hooleyi from the English Lower Cretaceous, which also exhibits dermal bones with ridges and tubercles, and scales morphologically somewhat similar to those of B. lamarquensis.


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.


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.


The osteology of Ligulella, a very small halecostome fish from the Middle Jurassic of Kisangani (Stanleyville Formation) in the Democratic Republic of Congo, is studied in detail on the basis of more than 100 specimens. It is shown that the genus is monospecific and that Ligulella fourmarieri is a junior synonym of Ligulella sluysi. The dermic bones of the skull roof are covered by a thin and smooth layer of ganoin. The lateral borders of the skull roof are ornamented with a fringe of large bony spines. A small toothed laterodermethmoid is located medially at the symphysis of the upper jaw and rejects laterally the premaxillae. The quadrate is devoid of a bony quadratic process. Both quadrate and symplectic articulate with the lower jaw. Based on its characters Ligulella has to be positioned in the neopterygian phylogenetic tree between the Pachycormiformes and the "Pholidophoriformes", allowing the creation of a new and peculiar ordinal status for it, the Ligulelliformes nov. ord.


The osteology of Catervariolus, a small fish from the Middle Jurassic of Kisangani (Stanleyville Formation) in the Democratic Republic of Congo, is studied in detail on the basis of more than 600 specimens. It is shown that the genus is monospecific and that Catervariolus passaui is a junior synonym of Catervariolus hornemani. Catervariolus is less evolved than the "classical" teleosts. Indeed, its ural vertebra 1 is still divided into two distinct centra. It still has an opisthotic, a surangular, a prearticular, coronoids, a Meckelian bone, six épurais and nine hypurals. Its scales are lepisosteid and not cycloid. The inclusion of Catervariolus in the order "Pholidophoriformes" is justified by some specialized characters of its skeleton. It possesses an impair vomer, an ossified supraoccipital, a quadrate with a quadratic process, a toothed dermobasihyal and a foramen for the efferent pseudobranchial artery pierced in the parasphenoid. Long epineurals are fused with the neural arches. Indeed, these apomorphies separate the "Pholidophoriformes" from the Pachycormiformes, their plesiomorphic sister-order. The toothed laterodermethmoids of Catervariolus form the middle of the upper jaw and reject laterally the premaxillae. The African fossil fish does not yet have an hypoethmoid associated with the vomer, neither a subtemporal fossa nor a bony prootico-intercalar bridge. It has three supraorbitals, three large postorbitals, a unique small supramaxilla and three toothed coronoids on the lower jaw. The toothed part of its dentary is elongated and not descending ventrally. The leptolepid notch of the oral border of the dentary is feebly developed or even absent. The combination of these characters shows that Catervariolus is the most primitive of all hitherto described "Pholidophoriformes".

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